OpenAI: gpt-oss-20b (free)

openai/gpt-oss-20b:free

Released Aug 5, 2025131,072 context

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

gpt-oss-20b is an open-weight 21B parameter model released by OpenAI under the Apache 2.0 license. It uses a Mixture-of-Experts (MoE) architecture with 3.6B active parameters per forward pass, optimized for lower-latency inference and deployability on consumer or single-GPU hardware. The model is trained in OpenAI’s Harmony response format and supports reasoning level configuration, fine-tuning, and agentic capabilities including function calling, tool use, and structured outputs.

Providers for gpt-oss-20b (free)

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

Performance for gpt-oss-20b (free)

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Effective Pricing for gpt-oss-20b (free)

Actual cost per million tokens across providers over the past hour

Apps using gpt-oss-20b (free)

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Recent activity on gpt-oss-20b (free)

Total usage per day on OpenRouter

Prompt

80.1M

Reasoning

12.9M

Completion

3.69M

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

Uptime stats for gpt-oss-20b (free)

Uptime stats for gpt-oss-20b (free) across all providers

Sample code and API for gpt-oss-20b (free)

OpenRouter normalizes requests and responses across providers for you.

OpenRouter supports reasoning-enabled models that can show their step-by-step thinking process. Use the reasoning parameter in your request to enable reasoning, and access the reasoning_details array in the response to see the model's internal reasoning before the final answer. When continuing a conversation, preserve the complete reasoning_details when passing messages back to the model so it can continue reasoning from where it left off. Learn more about reasoning tokens.

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.

gpt-oss-20b (free) - API Pricing & Providers | OpenRouter