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OpenAI: gpt-oss-120b

openai/gpt-oss-120b:free

Model weights

gpt-oss-120b is an open-weight, 117B-parameter Mixture-of-Experts (MoE) language model from OpenAI designed for high-reasoning, agentic, and general-purpose production use cases. It activates 5.1B parameters per forward pass and is optimized to run on a single H100 GPU with native MXFP4 quantization. The model supports configurable reasoning depth, full chain-of-thought access, and native tool use, including function calling, browsing, and structured output generation.

Modalities

Price

Free

Context

131K

Released

Aug 5, 2025

Knowledge Cutoff

Jun 2024

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Activity

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Frequently asked questions

gpt-oss-120b is an open-weight, 117B-parameter Mixture-of-Experts (MoE) language model from OpenAI designed for high-reasoning, agentic, and general-purpose production use cases. It activates 5.1B parameters per forward pass and is optimized to run on a single H100 GPU with native MXFP4 quantization.

Yes. The pricing shown on this page for gpt-oss-120b is zero, so you are not charged for prompt or completion tokens. Free endpoints are rate limited — see the rate limit docs.

gpt-oss-120b has a 131,072 token context window.

GPT-5.6 Luna Pro, GPT-5.6 Luna, GPT-5.6 Terra Pro and 55 more are other text models from OpenAI.

gpt-oss-120b was released on August 5, 2025. Its knowledge cutoff is June 30, 2024.