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-20b:freegpt-oss-20b (free) is an API model from OpenAI, released on Aug 5, 2025, with a context window of 131,072 tokens, pricing of Free per million input tokens and Free 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 Free.
Specs are sourced from OpenRouter and were last checked on Aug 14, 2026. Always confirm current pricing and limits with the provider before production use.
gpt-oss-20b (free) supports a context window of 131,072 tokens.
gpt-oss-20b (free) is listed at Free per million input tokens and Free per million output tokens on OpenRouter.
gpt-oss-20b (free) was published on Aug 5, 2025.
gpt-oss-20b (free) accepts text input and produces text output.