Sutskever left Google Brain to co-found OpenAIAn AI research company — created GPT, ChatGPT, DALL-E, and the o-series reasoning models.'s research program. He oversaw the scaling laws work behind GPTGenerative Pre-trained Transformer — OpenAI's family of large language models from GPT-1 through GPT-5.-3, ChatGPTOpenAI's conversational chat product — brought large language models to hundreds of millions of users., and later o1-style reasoningStep-by-step logical thinking in AI models — chain-of-thought before answering hard problems. models before leaving to start Safe Superintelligence.

Sutskever defined OpenAIAn AI research company — created GPT, ChatGPT, DALL-E, and the o-series reasoning models.'s research direction from inception through the LLMLarge language model — a neural network trained on vast text to generate and reason about language. era.

His leadership turned transformerA neural network architecture using attention — the foundation of modern large language models. scaling into consumer products.