OpenAI o1 is a reasoning model trained with reinforcement learning to handle complex tasks. It thinks before it answers, producing a long internal chain of thought before responding, and is well suited to math, science, coding, and multi-step analytical reasoning. Supports a 200,000-token input context with 100,000 output tokens, accepts text and image inputs, and exposes streaming, function calling, and structured outputs. Priced at $15 / $60 per 1M input/output tokens ($7.50 cached input).
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