OpenAI o3 requires bringing your own API key. Set up here: https://openrouter.ai/settings/integrations

OpenAI: o3

openai/o3

Created Apr 16, 2025200,000 context

$10/M input tokens$40/M output tokens$7.65/K input imgs

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. Note that BYOK is required for this model. Set up here: https://openrouter.ai/settings/integrations

Providers for o3

OpenRouter routes requests to the best providers that are able to handle your prompt size and parameters, with fallbacks to maximize uptime.

Apps using o3

Top public apps this week using this model

Recent activity on o3

Tokens processed per day

Uptime stats for o3

Uptime stats for o3 across all providers

Sample code and API for o3

OpenRouter normalizes requests and responses across providers for you.

OpenRouter provides an OpenAI-compatible completion API to 300+ models & providers that you can call directly, or using the OpenAI SDK. Additionally, some third-party SDKs are available.

In the examples below, the OpenRouter-specific headers are optional. Setting them allows your app to appear on the OpenRouter leaderboards.

Using third-party SDKs

For information about using third-party SDKs and frameworks with OpenRouter, please see our frameworks documentation.

See the Request docs for all possible fields, and Parameters for explanations of specific sampling parameters.