OpenAI: o3 Pro

OpenAIID: openai/o3-pro

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

Pricing per 1M Tokens

Input (Prompt)$20
Output (Completion)$80
Cache ReadFree
Cache WriteFree
ImageN/A

Specifications

Context Length200K
Max Output Tokens100K
Input ModalitiesText + File + Image
Output ModalitiesText
TokenizerGPT
Instruct TypeN/A
Top Provider Context200K
Top Provider Max Output100K
ModeratedYes

Compare this model

See how OpenAI: o3 Pro stacks up against other models.

vs OpenAI: GPT-5.4 Nanovs OpenAI: GPT-5.4 Minivs OpenAI: GPT-5.4 Provs OpenAI: GPT-5.4vs OpenAI: GPT-5.3 Chat

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Last updated: March 23, 2026

First tracked: March 23, 2026