gpt-oss-120b
by OpenAI
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. I
Models
gpt-oss-120b
Added 10 July 2026
Overview
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...
How to use / API access
Call via OpenRouter with model id `openai/gpt-oss-120b`.
- openrouter ·
openai/gpt-oss-120bDocs
OpenRouter id: openai/gpt-oss-120b
Benchmarks
- Intelligence Index (artificial-analysis) : 12.3 index
- Coding Index (artificial-analysis) : 30.4 index
- Agentic Index (artificial-analysis) : 6.2 index
- Design Arena 3d (other) : 930 elo · #107
- Design Arena codecategories (other) : 979 elo · #115
- Design Arena dataviz (other) : 1003 elo · #105
- Design Arena gamedev (other) : 1017 elo · #104
Notes
gpt-oss-120b is listed in the EDNA Models directory from the OpenRouter catalogue.
Get the free Developer’s Field Guide
A 27-page field guide to the AI coding workflow with Claude. Claude Code, MCP servers, the prompt patterns that work, and what to delegate. Free.
Enter your work email. We send it straight over, plus a few short notes worth knowing. Unsubscribe any time.