OpenAI
gpt-oss-120b is a 117B-parameter open-weight Mixture-of-Experts (MoE) language model from OpenAI, designed for high-reasoning, agentic, and general-purpose production use cases. Activating just 5.1B parameters per pass, it is optimized to run on a single H100 GPU with native MXFP4 quantization. The model features configurable reasoning depth, full chain-of-thought access, and native tool use, including function calling, browsing, and structured output generation.
gpt-oss-120b is a 117B-parameter open-weight Mixture-of-Experts (MoE) language model from OpenAI, designed for high-reasoning, agentic, and general-purpose production use cases. Activating just 5.1B parameters per pass, it is optimized to run on a single H100 GPU with native MXFP4 quantization. The model features configurable reasoning depth, full chain-of-thought access, and native tool use, including function calling, browsing, and structured output generation.
gpt-oss-120b has a 131,072 token context window.
On AIHubMix, gpt-oss-120b costs $0.18 per million input tokens and $0.9 per million output tokens.
gpt-oss-120b accepts text input.
gpt-oss-120b supports thinking, function calling and structured outputs. Per-protocol parameter support is listed in the capability table on this page.
gpt-oss-120b 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-120b — no other code changes needed.
gpt-oss-120b is developed by OpenAI. AIHubMix aggregates it alongside models from other providers behind one API and one bill.
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Use gpt-oss-120b via the AIHubMix unified API — one interface for every major LLM.