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...
Tested on 10 benchmarks · BenchGecko score 74.2. Top scores: OpenCompass — AIME2025 (93.4%), OpenCompass — IFEval (90.2%), OpenCompass — MMLU-Pro (79.7%).
OpenCompass Live Code Bench v6. Fresh competitive programming problems to evaluate code generation without memorization.
Multi-language code editing from Aider. Tests editing ability across Python, JavaScript, TypeScript, Java, C++, Go, Rust, and more.
OpenCompass evaluation on AIME 2025 problems. Tests mathematical reasoning on fresh competition problems.
OpenCompass MMLU-Pro evaluation. Harder knowledge test with more answer choices.
OpenCompass evaluation of GPQA Diamond. PhD-level science questions from the hardest subset.
OpenCompass evaluation of Humanitys Last Exam. Expert-level cross-discipline knowledge test.
- Typetext
- Context131K tokens (~66 books)
- ReleasedAug 2025
- LicenseOpen Source
- StatusActive
- Cost / Message~$0.000
Frequently Asked Questions
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- gpt-oss-120b (free) by OpenAI. BenchGecko score 74.2, rank 26 of 312 scored models (normalized average of public benchmark scores).
- List price free input · free output per 1M tokens (as of 2026-07-11).
How to cite · data as of 2026-07-11
gpt-oss-120b (free) · benchmarks, pricing and providers. BenchGecko, data as of 2026-07-11. https://benchgecko.ai/model/gpt-oss-120b-free
Credit "Source: BenchGecko" with a link. Prices per provider and Gecko Tests are BenchGecko data (CC BY 4.0); benchmark scores keep their original source, listed in the JSON. JSON · llms.txt · MCP