gpt-oss-20b-free · OpenAI
Developed by OpenAI, gpt-oss-20b-free is an open-weight 21B parameter model released under the Apache 2.0 license. This model utilizes a Mixture-of-Experts (MoE) architecture with 3.6B active parameters per forward pass. It supports an expansive context window of up to 131,072 tokens, making it well-suited for long-context tasks.
Developed by OpenAI, gpt-oss-20b-free is an open-weight 21B parameter model released under the Apache 2.0 license. This model utilizes a Mixture-of-Experts (MoE) architecture with 3.6B active parameters per forward pass. It supports an expansive context window of up to 131,072 tokens, making it well-suited for long-context tasks.
GPT Oss 20B (free) has a 131,072 token context window.
GPT Oss 20B (free) accepts text input.
GPT Oss 20B (free) supports reasoning, tool calling and long context. Per-protocol parameter support is listed in the capability table on this page.
GPT Oss 20B (free) is available through the AIHubMix unified API. The API is OpenAI-compatible: point your OpenAI SDK at https://aihubmix.com/v1, use your AIHubMix API key, and set the model name to gpt-oss-20b-free — no other code changes needed.
GPT Oss 20B (free) is developed by OpenAI. AIHubMix aggregates it alongside models from other providers behind one API and one bill.
GPT Oss 20B (free) was released on August 5, 2025 by OpenAI.
Paid version: gpt-oss-20b
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