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OpenAI: o3 Pro

openai/o3-pro

Released Jun 10, 2025Knowledge cutoff Jun 30, 2024200,000 context$20/M input tokens$80/M output tokens

The o-series of models are trained with reinforcement learning to think before they answer and perform complex reasoning. The o3-pro model uses more compute to think harder and provide consistently better answers.

Note that BYOK is required for this model. Set up here: https://openrouter.ai/settings/integrations(opens in new tab)

Recent activity on o3 Pro

Total usage per day on OpenRouter

Prompt
435K
Reasoning
70K
Completion
20K

Prompt tokens measure input size. Reasoning tokens show internal thinking before a response. Completion tokens reflect total output length.