gpt-oss-20b
active
OpenAI2025-08-05
Specifications
Modalities
text
Context Window131K tokens
Max Output-
Training Cutoff-
Open SourceYes
Pricing (per 1M tokens)
Input$-
Output$-
Benchmarks
Arena score (text)1317
Arena ratings: LMArena leaderboard dataset, CC BY 4.0, snapshot 2026-10-28.
MMLU-Pro-
SWE-Bench-
GPQA Diamond-
HumanEval-
ARC-AGI-
MATH-
Sources
- OpenAI: All models | OpenAI API
general · as of 2026-07-04
- OpenAI: Introducing gpt-oss
release date · as of 2026-07-04
- LMArena: Arena leaderboard dataset, text_style_control overall: gpt-oss-20b
elo rating · as of 2026-10-28