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...
openai/gpt-oss-20bgpt-oss-20b is an API model from OpenAI, released on Aug 5, 2025, with a context window of 131,072 tokens, pricing of $0.03 per million input tokens and $0.13 per million output tokens. It accepts text input and produces text output.
At listed prices, a request with 10,000 input tokens and 1,000 output tokens costs about $0.00043.
Specs are sourced from OpenRouter and were last checked on Nov 3, 2026. Always confirm current pricing and limits with the provider before production use.
gpt-oss-20b supports a context window of 131,072 tokens.
gpt-oss-20b is listed at $0.03 per million input tokens and $0.13 per million output tokens on OpenRouter.
gpt-oss-20b was published on Aug 5, 2025.
gpt-oss-20b accepts text input and produces text output.