gpt-oss-120b

OpenAI· released 5 Aug 2025

openai/gpt-oss-120b

Input / 1M tokens: $0.037
Output / 1M tokens: $0.17

Context window131K tokens

Longest answer: 118K tokens

reads textopen weightstool callingreasoning

About

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...

Details

Lab: OpenAIopenrouter.ai · 3 Oct 2026
Context: 131Kopenrouter.ai · 3 Oct 2026
Input price: $0.037 / 1Mopenrouter.ai · 3 Oct 2026
Output price: $0.17 / 1Mopenrouter.ai · 3 Oct 2026
Max output: 117,964 tokensopenrouter.ai · 3 Oct 2026
Inputs: textopenrouter.ai · 3 Oct 2026
Open weights: Yesopenrouter.ai · 3 Oct 2026

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Sources

openrouter.ai/openai/gpt-oss-120b· checked 3 Oct 2026