gpt-oss-20b (free) chat

openrouter
openai
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...

Capabilities

Context Window 131k tokens
Max Output 32k tokens
Inputs
Outputs

Pricing (per 1M tokens)

Input $-
Output $-
Cache Read -
Cache Write -

Supported Parameters

frequency_penaltyinclude_reasoningmax_tokensmin_ppresence_penaltyreasoningrepetition_penaltyresponse_formatseedstopstructured_outputstemperaturetool_choicetoolstop_atop_ktop_p

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