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OpenAI: o3

openai/o3

Released Apr 16, 2025Knowledge cutoff Jun 30, 2024200,000 context
$2/M input tokens$8/M output tokens$10/K web search

o3 is a well-rounded and powerful model across domains. It sets a new standard for math, science, coding, and visual reasoning tasks. It also excels at technical writing and instruction-following. Use it to think through multi-step problems that involve analysis across text, code, and images.

Recent activity on o3

Total usage per day on OpenRouter

Prompt
143M
Completion
26.2M
Reasoning
21.3M

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