DeepSeek: R1 0528 (free)

deepseek/deepseek-r1-0528:free

Created May 28, 2025163,840 context

$0/M input tokens$0/M output tokens

May 28th update to the original DeepSeek R1 Performance on par with OpenAI o1, but open-sourced and with fully open reasoning tokens. It's 671B parameters in size, with 37B active in an inference pass.

Fully open-source model.

DeepSeek: R1 0528 (free)

deepseek/deepseek-r1-0528:free

Created May 28, 2025163,840 context

$0/M input tokens$0/M output tokens

Fully open-source model.

Sample code and API for R1 0528 (free)

OpenRouter normalizes requests and responses across providers for you.

OpenRouter provides an OpenAI-compatible completion API to 400+ 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.