OpenAI
Trains the GPT models and runs ChatGPT, the chat assistant and its developer API.
Model lab|openai.com|models, assistant, api
Try first: ChatGPT
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Ai2Nonprofit institute releasing Olmo, a language model whose weights, data and training code are public.
AnthropicTrains the Claude models and ships them as a chat app, a terminal agent and an API.
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Google DeepMindRuns inside Google as its AI lab, behind Gemini, the Veo video models and AlphaFold.