What the evidence says
- Developer
- OpenAI
- Released
- August 5, 2025
- Domains
- Language
- Tasks
- Language modeling/generation · Question answering
- Access
- Open weights (unrestricted)
- Weights
- Open weights
Across the boards
Each row is one named authority's own current view. Nothing is combined.
- LMArena overall
- 1352.5 · rank #179 · 30,611 battles · published July 20, 2026 · board
- LMArena coding arena
- 1390.2 · rank #183 · board
- LMArena creative writing arena
- 1277.5 · rank #231 · board
- LMArena instruction following arena
- 1325.4 · rank #193 · board
- LMArena hard prompts arena
- 1362.0 · rank #184 · board
- LMArena multi-turn arena
- 1327.7 · rank #199 · board
- LMArena long queries arena
- 1324.3 · rank #223 · board
- LMArena math arena
- 1381.2 · rank #153 · board
- Aider polyglot
- 41.8% · rank #43 · system gpt-oss-120b (high) (system result, not a bare-model score)
- EQ-Bench 3
- 1167.5 · rank #49
Benchmark results
Epoch AI Benchmarking Hub scores for this reviewed identity. Rows with a scaffold are system results, not bare-model results. Fraction-unit scores shown as percentages.
- Terminal-Bench
- 18.7% · Terminus 2
Platform facts
OpenRouter's platform listing, retrieved July 22, 2026. Routed platform prices, not first-party provider prices.
- Input price
- $0.037 per 1M tokens
- Output price
- $0.17 per 1M tokens
- Context length
- 131,072 tokens
- Listed on OpenRouter
- August 5, 2025
Common questions
What is gpt-oss-120b?
gpt-oss-120b is a OpenAI model released August 5, 2025, according to Epoch AI's reviewed catalog record. The record classifies it under language.
How does gpt-oss-120b rank on LMArena?
In the LMArena style-controlled text snapshot published July 20, 2026, gpt-oss-120b holds official rank 179 with a rating of 1352.5 across 30,611 battles.
What does gpt-oss-120b cost?
OpenRouter lists it at $0.037 per million input tokens and $0.17 per million output tokens, retrieved July 22, 2026. Those are the platform's routed prices, not first-party provider prices.