Top Deep Learning Interview Questions and Answers for 2024

“AutoML models work really, really well in these kinds of instances,” Carlsson said. The goal of AutoML is to both speed up the AI development process as well as make the technology more accessible. 2024 stands to be a pivotal year for the future of AI, as researchers and enterprises seek to establish how this evolutionary leap in technology can be most practically integrated into our everyday lives. Access our full catalog of over 100 online courses by purchasing an individual or multi-user digital learning subscription today, enabling you to expand your skills across a range of our products at one low price. Transform standard support into exceptional care when you give your customers instant, accurate custom care anytime, anywhere, with conversational AI.

• To understand the basic concept of the gradient descent process, let’s consider a basic example of a neural network consisting of only one input and one output neuron connected by a weight value w.
• They must understand client needs, which vary from one client to the next; home layout and design; integration of technology into a home; use of automation; networking; and energy efficiency.
• Human interaction should be the superior solution and the key expert in managing and handling supply chain risks.
• Some are using AI to gain insights from a broader data set collected from Internet of Things (IoT) devices deployed across the supply chain.
• MuZero is an AI algorithm developed by DeepMind that combines reinforcement learning and deep neural networks.

Simplilearn’s Artificial Intelligence basics program is designed to help learners decode the mystery of artificial intelligence and its business applications. The course provides an overview of AI concepts and workflows, machine learning and deep learning, and performance metrics. You’ll learn the difference between supervised, unsupervised and reinforcement learning, be exposed to use cases, and see how clustering and classification algorithms help identify AI business applications. The Deep learning is a subset of machine learning that involves systems that think and learn like humans using artificial neural networks. The term ‘deep’ comes from the fact that you can have several layers of neural networks. Examples of supervised learning algorithms include decision trees, support vector machines, gradient descent and neural networks.

Whether used for decision support or for fully automated decision-making, AI enables faster, more accurate predictions and reliable, data-driven decisions. Combined with automation, AI enables businesses to act on opportunities and respond to crises as they emerge, in real time and without human intervention. As more businesses embrace digitization and automation, generative AI looks set to play a central role in various industries, with many organizations already establishing guidelines for the acceptable ChatGPT use of AI in the workplace. The capabilities of generative AI have already proven valuable in areas such as content creation, software development, medicine, productivity, business transformation, and much more. As the technology continues to evolve, so too will generative AI’s applications and use cases. It is based on GPT-4, a large language model using transformer architecture — specifically, the generative pretrained transformer, hence GPT — to understand and generate human-like text.

How do I become a deep learning engineer?

Data administrators assist in database design and update existing databases. They are responsible for setting up and testing new database and data handling systems, sustaining the security and integrity of databases and creating complex query definitions that allow data to be extracted. Applying various analytical and modeling techniques to understand data, make predictions, and test hypotheses. The ability to approach data analytically, identify trends and anomalies, and make data-driven decisions.

This can lead to discrimination and unfair treatment of certain groups of people. It is crucial to ensure AI algorithms are unbiased and do not perpetuate existing biases or discrimination. In any discussion of AI algorithms, it’s important to also underscore the value of using the right data in the training of algorithms. Either way, Carlsson said those metrics very rarely match up to what the business problem actually is. Dimensionality reduction – In an ocean of information, ML can choose which data are the most significant and how they can be summarised. In practice, it is applied in such fields as photo processing and text analysis.

Examples of good AI use cases

There is much concern over worker displacement due to the use of AI technology. Massachusetts Institute of Technology (MIT) economists Daron Acemoglu, David Autor, and Simon Johnson have written about how digital technologies have exacerbated inequality over the past 40 years. Generative AI can assist in writing, researching, and editing as well as creating graphics, videos, and other media. It can be used for everything from marketing campaigns to business document templates like proposals and presentations. AI can also transcribe and translate language and generate code, providing businesses with quicker, easier, and more cost-effective access to these specialized skill sets.

• Traditionally, AI is defined as the development of computer systems capable of performing tasks that typically require human intelligence.
• People check their social media accounts on a frequent basis, including Facebook, Twitter, Instagram, and other sites.
• In general, machine learning is a highly sought-after skill in today’s tech industry, and as such, professionals who possess expertise in this field are in high demand.
• Supply chain managers are always looking to better understand their operation.
• K nearest neighbor algorithm is a classification algorithm that works in a way that a new data point is assigned to a neighboring group to which it is most similar.
• This growth is partly because many companies are starting their own AI initiatives or acquiring new AI startups.

With reinforced learning, we don’t have to deal with this problem as the learning agent learns by playing the game. It will make a move (decision), check if it’s the right move (feedback), and keep the outcomes in memory for the next step it takes (learning). There is a reward for every correct decision the system takes and punishment for the wrong one.

They also put more of an emphasis on creating experiments and utilizing sophisticated statistical models. Both data scientists and data analysts work with large amounts of data; however, their roles are separate. An analyst primarily interprets existing data, identifies trends, and creates reports to inform business decisions. They use data analysis tools like Excel, SQL, and visualization software to make data accessible. Deep learning models tend to increase their accuracy with the increasing amount of training data, whereas traditional machine learning models such as SVM and naive Bayes classifier stop improving after a saturation point. Deep learning’s artificial neural networks don’t need the feature extraction step.

It accepts the weighted sum of the inputs and bias as input to any activation function. Step function, Sigmoid, ReLU, Tanh, and Softmax are examples of activation functions. “Without transparency, we risk creating AI systems that could inadvertently perpetuate harmful biases, make inscrutable decisions or even lead to undesirable outcomes in high-risk applications,” Masood said. Artificial intelligence can be applied to many sectors and industries, including the healthcare industry for suggesting drug dosages, identifying treatments, and aiding in surgical procedures in the operating room. While many prominent FSL algorithms were originally developed for (or proven on) image classification tasks, FSL can also be used for more complex computer vision problems. Gradient optimization can then be performed within that learned, low-dimensional embedding space.

We cannot predict the values of these weights in advance, but the neural network has to learn them. When an artificial neural network learns, the weights between neurons change, as does the strength of the connection. Given training data and a particular task such as classification of numbers, we are looking for certain set weights that allow the neural network to perform the classification.

What is machine learning? Guide, definition and examples

The role of a machine learning engineer is pivotal in the era of data-driven decision-making and automation. By acquiring the necessary skills and qualifications, aspiring engineers can embark on a rewarding career that offers intellectual stimulation, a competitive salary, and the chance to shape the future of technology. The salary of machine learning engineers can vary based on experience, location, industry, and the complexity of the work.

In this tutorial, you learned the basics of the stock market and how to perform stock price prediction using machine learning. As you can see above, the model can predict the trend of the actual stock prices very closely. The accuracy of the model can be enhanced by training with more data and increasing the LSTM layers. The Open column tells the price at which a stock started trading when the market opened on a particular day. The Close column refers to the price of an individual stock when the stock exchange closed the market for the day.

An AI-powered supply chain has many potential benefits for building supply chain resilience and a stronger base for manufacturers. Read about the current challenges facing supply chains and how to improve overall resiliency. It is impossible for it to be creative or inventive since robots cannot think in the same way that people can. When it comes to human insights, there is almost always the possibility of “human mistake,” which refers to the fact that some nuances may be overlooked at some time or another. Because it evaluates based on the entirety of the acquired facts, AI is exceptionally objective when it comes to making decisions.

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By learning a pattern from sample inputs, the machine learning algorithm predicts and performs tasks solely based on the learned pattern and not a predefined program instruction. Machine learning is a life savior in several cases where applying strict algorithms is not possible. It will learn the new process from previous patterns and execute the knowledge. In today’s fast-paced digital landscape, businesses are constantly seeking innovative ways to stay competitive and drive growth. One transformative technology that has emerged as a game-changer is machine learning.

AI can quickly process large volumes of current and historical data, drawing conclusions, capturing insights, and forecasting future trends or behaviors. These can help businesses facilitate better decision making about customers, offerings, and directions for future business growth. A start-up called Unlearn in San Francisco, California, creates digital twins of patients in clinical trials. Based on an experimental patient’s data at the start of a trial, researchers can use the twin to predict how the same patient would have progressed in the control group and compare outcomes.

The statistics show that machine learning is the shining star of the technology and enterprise sectors. As technology advances, AI and ML applications spread to practically every area, including healthcare, education, e-commerce, logistics, etc. This opens up chances for Machine Learning engineers, data scientists, data mining specialists, and data engineers in various industries. GANs generate realistic data by training two neural networks in a competitive setting. To create a foundation model, practitioners train a deep learning algorithm on huge volumes of raw, unstructured, unlabeled data—e.g., terabytes of data culled from the internet or some other huge data source. Deep learning is the area of machine learning that deals with neural networks, which are models of the brain used to solve complex problems.

Models learn to do a task—spot faces, translate sentences, avoid pedestrians—by training with a specific set of examples. Yet they can generalize, learning to do that task with examples they have not seen before. Somehow, models do not just memorize patterns they have seen but come up with rules that let them apply those patterns to new cases. And sometimes, as with grokking, generalization happens when we don’t expect it to. Few-shot learning is a machine learning framework in which an AI model learns to make accurate predictions by training on a very small number of labeled examples. It’s typically used to train models for classification tasks when suitable training data is scarce.

Attend conferences, join machine learning communities, and connect with professionals in the field to stay updated and gain insights. To fully capitalize on these platforms, solid foundational knowledge in Artificial Intelligence and ML is paramount. That’s where Simplilearn’s Post Graduate Program in Artificial Intelligence and Machine Learning comes into play. This comprehensive program, in partnership with Purdue University and in collaboration with IBM, equips you with the essential skills and hands-on experience to excel in the fast growing field of AI and ML. A vibrant community and robust customer support can be lifesavers when you hit a snag in your machine learning journey.

Explainable AI practices and techniques can help practitioners and users understand and trust the processes and outputs of generative models. Transformer models can also be trained or tuned to use tools—e.g., ChatGPT App a spreadsheet application, HTML, a drawing program—to output content in a particular format. Machine learning roles are generally well-paid, with the potential for high earning potential.

What is Bias and Variance in a Machine Learning Model?

AI is fueling advances across multiple industries as well as functional areas, such as supply chain operations. He said research has found, for example, that students sometimes are more comfortable asking chatbots questions about lessons rather than humans. “The students are worried that they might be judged or be [thought of as] stupid by asking certain questions. But with AI, there is absolutely no judgment, so people are often actually more comfortable interacting with it.” Similarly, AI itself does not have any human emotions or judgment, making it a useful tool in a variety of circumstances. For example, AI-enabled customer service chatbots won’t get flustered, pass judgment or become argumentative when dealing with angry or confused customers. That can help users resolve problems or get what they need more easily with AI than with humans, Kim said.

All supply chain professionals should be aware of potential downtime and be transparent with partners that it might occur. AI uses historical and real-time data to make real-time decisions, oftentimes with conversational answers. AI processes the data and can analyze the root of the problem and suggest a solution, in that moment.

Our machine-learning interview questions and answers will help you to prepare for the job interview. If you’re looking to enhance your career in IT, data science, or Python programming and enter into a new field full of potential, both now and in the future, taking on the challenge of learning machine learning will get you there. You can foun additiona information about ai customer service and artificial intelligence and NLP. A career in machine learning offers the opportunity to work on cutting-edge technologies, solve complex problems, and significantly impact various industries.

AI-powered supply chain management tools can track supplies as they make their way through the various links and partners in the supply chain. AI in supply chain management has the potential to improve demand forecasting, inventory evaluation, customer communication, operational performance and even sustainability. In manufacturing, AI has long played a critical role in automating repetitive, rote physical tasks.

Optimization-based meta learning approaches, also referred to as gradient-based meta learning (GMBL), aim to learn initial model parameters or hyperparameters for a neural network that can be efficiently fine-tuned for relevant tasks. They achieve by optimizing the process of gradient descent—that is, by meta-optimizing the process of optimization itself. Deep learning traditionally requires many iterative updates of model parameters through backpropagation and gradient descent, which in turn depends on a huge quantity of labeled examples to populate training batches. To efficiently train a neural network from scratch for few-shot learning requires a way to optimize model weights in only a few update steps. Whereas approaches built upon transfer learning adapt pre-trained models, meta learning methods often train systems end-to-end from scratch.

Several states — including California, Illinois, Texas and Colorado — have introduced or passed laws focused on protecting consumers from harms caused by AI. Translation jobs that require less nuance — such as entry level jobs involving literal text translation — are more likely to implement AI successfully. One example of a generative AI-powered marketing campaign was the #NotJustACadburyAd campaign, which used the digital likeness of Bollywood star Shah Rukh Khan to create thousands of hyper-personalized ads for small local businesses. The campaign used a microsite that enabled small-business owners to create their own version of the ad featuring the Bollywood star.

The responsibilities of this role have evolved to meet the demands of modern generative AI applications and fall under multiple categories. Here are the key facets of the job of AI engineer, followed by responsibilities. This article details what a career as an AI engineer is all about, providing insights into the skills, responsibilities, compensation and the future outlook for this profession. The debut of ChatGPT in 2023 accelerated interest in AI and specifically in generative AI. That interest has led to a wave of adoption and technology development as organizations of all sizes attempt to capitalize on its potential benefits.

In this case, it is an AI product, but it’s not much different from any other product in terms of leading teams, scheduling and meeting milestones. Only 11% of job openings offered fully remote work, and another 15% allowed for a hybrid situation of on-premises work and remote work. Google Maps is a comprehensive navigation app that uses AI to offer real-time traffic updates and route planning. Its key feature is the ability to provide accurate directions, traffic conditions, and estimated travel times, making it an essential tool for travelers and commuters. Spotify uses AI to recommend music based on user listening history, creating personalized playlists that keep users engaged and allow them to discover new artists.

In contrast, predictive AI analyzes large datasets to detect patterns over history. By identifying these patterns, predictive AI may conclude and forecast possible outcomes or future trends. Both generative and predictive AI use advanced algorithms to tackle complicated business and logistical challenges, yet they serve different purposes. Knowing their different goals, approaches, and techniques can help businesses understand when and how to employ them. As we navigate through 2024, the landscape of deep learning continues to evolve, bringing forth innovative algorithms that push the boundaries of what machines can achieve. From the image recognition prowess of Convolutional Neural Networks (CNNs) to the transformative capabilities of Transformer Networks, these top 10 deep learning algorithms are at the forefront of technological advancement.

The hype around AI and the fear of job losses has created a difficult dynamic for HR departments to manage in the interim. Some people draw an analogy between ChatGPT and when students weren’t allowed to use calculators in the classroom. There might also be a time when it becomes accepted for students to use ChatGPT to aid with schoolwork. Teacher sentiments range from being worried about the technology replacing them to insisting that the in-person classroom connection is essential to education. For example, Microsoft 365 Copilot — a collection of AI-powered tools integrated into Microsoft’s productivity suite — could radically increase office workers’ productivity.

ML is a subset of AI, which involves creating intelligent machines that learn from experience without explicit programming. It is an analytical model creation technique that uses data parsing and analysis to find patterns and make informed decisions with little or no human intervention. The three-layered neural network consists of three layers – input, hidden, and output layer. When the input data is applied to the input layer, output data in the output layer is obtained.

Deep learning has gained massive popularity in scientific computing, and its algorithms are widely used by industries that solve complex problems. All deep learning algorithms use different types of neural networks to perform specific tasks. A deep learning engineer is responsible for building and maintaining the algorithms that power Artificial Intelligence applications.

Instead, users were able to generate images of Black popes and female Nazi soldiers. The landscape of AI-driven careers is dynamic and promising, offering a range of opportunities that cater to various interests and skill sets. From developing sophisticated algorithms as an AI/ML Engineer to ensuring ethical compliance as an AI Ethics Officer, the roles within this field are integral to harnessing the potential of AI across industries. EWeek has the latest technology news and analysis, buying guides, and product reviews for IT professionals and technology buyers. The site’s focus is on innovative solutions and covering in-depth technical content.

It analyzes vast patterns in datasets to mimic style or structure to replicate a wide array of contemporary or historical content. A subset of AI is machine learning (ML), which is the process of a system taking in data sets and learning processes from them, as opposed to being programmed with built-in instructions. It can forecast customer demand, discover patterns, make market predictions, interpret voice and written text, and analyze a multitude of factors that can optimize a supply chain’s workflow. Deep Learning algorithms must be used by a deep learning engineer to create and improve perception algorithms for autonomous cars.

AI enables the development of smart home systems that can automate tasks, control devices, and learn from user preferences. AI can enhance the functionality and efficiency of Internet of Things (IoT) devices and networks. AI applications in healthcare include disease diagnosis, medical imaging analysis, drug discovery, personalized medicine, and patient monitoring. AI can assist in identifying patterns in medical data and provide insights for better diagnosis and treatment. The hidden layers are responsible for all our inputs’ mathematical computations or feature extraction. Each one of them usually represents a float number, or a decimal number, which is multiplied by the value in the input layer.

The processing of data and commands is essential to the operation of AI-powered devices. The purpose of human intelligence is to combine a range of cognitive activities in order to adapt to new circumstances. The origins of human intelligence and conduct may be traced back to the individual’s unique combination of genetics, upbringing, and exposure to various what is machine learning and how does it work situations and environments. And it hinges entirely on one’s freedom to shape his or her environment via the application of newly acquired information. The node multiplies the inputs with random weights, calculates them, and adds a bias. Finally, nonlinear functions, also known as activation functions, are applied to determine which neuron to fire.

OpenAI launches new AI model o1 with PhD-level performance

Given the latter then, the entire tech industry is waiting for OpenAI to announce GPT-5, its next-generation language model. We’ve rounded up all of the rumors, leaks, and speculation leading up to ChatGPT’s next major update. The landscape of AI tools like ChatGPT is rich and varied, reflecting the growing role of artificial intelligence in everyday life and work. Each tool offers unique capabilities to meet users ‘ evolving needs, from enhancing personal well-being with Replika to boosting workplace productivity with Pi.

• In this article, we’ll analyze these clues to estimate when ChatGPT-5 will be released.
• Recently, there has been a flurry of publicity about the planned upgrades to OpenAI’s ChatGPT AI-powered chatbot and Meta’s Llama system, which powers the company’s chatbots across Facebook and Instagram.
• It just unveiled its own Gemini Live AI assistant that’s multi-modal with impressive voice and video capabilities.
• Each GPT-4 request made will set you back 30 requests, giving you around three free GPT-4 questions per day (which is roughly in line with most other free GPT-4 tools).
• ChatGPT is AI-powered and utilizes LLM technology to generate text after a prompt.

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What Is OpenAI’s GPT-5?

The new model includes information through April 2023, so it can answer with more current context for your prompts. Altman expressed his intentions to never let ChatGPT’s info get that dusty again. How this information is obtained remains a major point of contention for authors and publishers who are unhappy with how their writing is used by OpenAI without consent. Looking ahead, OpenAI will continue to develop both its GPT and o1 series, further expanding the capabilities of AI in various fields. Users can expect ongoing advancements as the company works to increase the usefulness and accessibility of these models across different applications. Although the o1-preview and o1-mini models are powerful tools for reasoning and problem-solving, OpenAI acknowledges that this is just the beginning.

• OpenAI denied reports that it is intending to release an AI model, code-named Orion, by December of this year.
• A ChatGPT Plus subscription is still the overall best option due to its extensive array of features, but if you just have a few questions you want answered, Copilot is the next best option.
• Ryan Morrison provides some great insight into what OpenAI will need to do to beat Google at its own game — including making it available as part of the free plan.

Copilot does not have such expansive availability with support for only 24 languages. Upgrade your lifestyleDigital Trends helps readers keep tabs on the fast-paced world of tech with all the latest news, fun product reviews, insightful editorials, and one-of-a-kind sneak peeks. Christoph Schwaiger is a journalist who mainly ChatGPT covers technology, science, and current affairs. His stories have appeared in Tom’s Guide, New Scientist, Live Science, and other established publications. Always up for joining a good discussion, Christoph enjoys speaking at events or to other journalists and has appeared on LBC and Times Radio among other outlets.

Are there issues regarding plagiarism with ChatGPT?

OpenAI launched ChatGPT Search, an evolution of the SearchGPT prototype it unveiled this summer. Here’s a timeline of ChatGPT product updates and releases, starting with the latest, which we’ve been updating throughout the year. Say goodbye to the perpetual reminder from ChatGPT that its information cutoff date is restricted to September 2021. “We are just as annoyed as all of you, probably more, that GPT-4’s knowledge about the world ended in 2021,” said Sam Altman, CEO of OpenAI, at the conference.

For instance, ChatGPT-5 may be better at recalling details or questions a user asked in earlier conversations. This will allow ChatGPT to be more useful by providing answers and resources informed by context, such as remembering that a user likes action movies when they ask for movie recommendations. However, OpenAI’s previous release dates have mostly been in the spring and summer. GPT-4 was released on March 14, 2023, and GPT-4o was released on May 13, 2024. So, OpenAI might aim for a similar spring or summer date in early 2025 to put each release roughly a year apart. Claude will remain the frontrunner until OpenAI can demonstrate the latest version of the GPT model.

Finally, once GPT-5 rolls out, we’d expect GPT-4 to power the free version of ChatGPT. There’s no public roadmap for GPT-5 yet, but OpenAI might have an intermediate version ready in September or October, GPT-4.5. But OpenAI is involved in at least one lawsuit that has implications for AI systems trained on publicly available data, which would touch on ChatGPT.

In fact, OpenAI has left several hints that GPT-5 will be released in 2024. With competitors pouring billions of dollars into AI research, development, and marketing, OpenAI needs chat gpt 5 features to ensure it remains competitive in the AI arms race. Despite these confirmations that ChatGPT-5 is, in fact, being created, OpenAI has yet to announce an official release date.

OpenAI’s “ChatGPT and GPT-4” Spring Update stream starts in 20 minutes.

This next LLM (Large Language Model) will surpass existing competition from Microsoft Bing Chat and Google Bard. ChatGPT is expected to announce its new search feature Monday, unnamed company sources told Reuters. Users who want to access the complete range of ChatGPT GPT-5 features might have to become ChatGPT Plus members. That means paying a fee of at least $20 per month to access the latest generative AI model.

The next ChatGPT alternative is YouChat, an emerging alternative to ChatGPT designed to enhance user interaction and engagement through advanced conversational AI capabilities. Developed by the innovative team at You.com, YouChat integrates seamlessly into the broader You.com ChatGPT App search engine ecosystem, providing users with a dynamic and interactive search experience. It stands out for its ability to understand and generate human-like responses, making it an effective tool for customer support, personal assistance, and general information retrieval.

According to some reports, GPT-5 should complete its training by December 2023. OpenAI might release the ChatGPT upgrade as soon as it’s available, just like it did with the GPT-4 update. Even if GPT-5 doesn’t reach AGI, we expect the upgrade to deliver major upgrades that exceed the capabilities of GPT-4.

If this is conceptually possible, then it logically follows that the intelligence we create, already smarter than ourselves, will be able to create an intelligence smarter than itself. This is the point known as AI singularity – where the growth (in power and distribution) of AI becomes untameable and irreversible. At such a point, we had better be very confident that what we have created has goals and objectives aligned with our own. You can foun additiona information about ai customer service and artificial intelligence and NLP. This is called the alignment problem, which I’d love to go into more detail about, but really it deserves its own article. Perhaps in an effort to underpromise and overdeliver, Altman calmly stated that “GPT-5 will be ok“, relative to the previous generations of GPT. However, there is clearly growing frustration with all aspects of Google – from the quality of Search results to its abundance of advertising.

Zoho brings internally developed AI to its productivity platform

On the eve of Google I/O, the confirmed details are very thin on the ground, but we have some leaks and rumors that point to two big things. Apparently, OpenAI executives have been discussing new price tiers for premium ChatGPT access. According to a press release Apple published following the June 10 presentation, Apple Intelligence will use ChatGPT-4o, which is currently the latest public version of OpenAI’s algorithm.

4o is claimed to have better performance across 50 different languages, with an API twice as fast as the one for GPT-4 Turbo. Tom’s Guide is part of Future US Inc, an international media group and leading digital publisher. We know very little about GPT-5 as OpenAI has remained largely tight lipped on the performance and functionality of its next generation model. We know it will be “materially better” as Altman made that declaration more than once during interviews. Google Maps is supremely useful, but it has heaps of features you’re probably not using. Imagine a scenario where GPT-4 is integrated into a diagnostic system for analyzing patient symptoms and medical reports.

According to the latest available information, ChatGPT-5 is set to be released sometime in late 2024 or early 2025. Yes, GPT-5 is coming at some point in the future although a firm release date hasn’t been disclosed yet. High customization, strong integration capabilities, enterprise-grade security. ChatGPT with less verbose responses or different chat modes would motivate me to use the chatbot more often, although I do hope it doesn’t come at the expense of accuracy. In a briefing with The Verge, Murati said that the assistant is not actually designed to sound like Johansson and emphasized that OpenAI has had these voices for a while.