gpt-oss-20b
Open-weight 21B MoE, 3.6B active, Apache 2.0 (OpenRouter).
- Vendor
- OpenAI
- Kind
- llm
- Tier
- small
- Weights
- open
- Released
- 2025-08
- Context
- 131k tokens
Our Go rating
Not rated yet: ratings come from tournament games against bots of known strength. See the leaderboard.
Games here
No published game yet.
Benchmarks
None recorded yet.
Other games
| Measure | Value | Unit | As of | Source |
|---|---|---|---|---|
| LLM Chess (high), ±133 | -258 | Elo (chess.com-anchored) | 2026-11-05 | LLM Chess (Saplin) Elo vs random player and Komodo Dragon, chess.com-a |
How we run it
- untested
ollama·gpt-oss:20b— not pulled on this Mac - disallowed
openrouter·openai/gpt-oss-20b— PA policy (2026-11-10): Anthropic/OpenAI/Google models run through their own agents or the free key, never OpenRouter unless PA asks explicitly