# gpt-oss-120b vs gpt-oss-20b (slim)

> gpt-oss-120b and gpt-oss-20b score within a point of each other for open-weight models you run yourself, 70.2 and 69.9 out of 100. Prices, MCP, x402, uptime and agent notes side by side.

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gpt-oss-120b and gpt-oss-20b score within a point of each other on agent readiness, 70.2 (BB) and 69.9 (B). gpt-oss-20b leads on reach. Both do open-weight models you run yourself.

- gpt-oss-120b: BB 70.2, rank #6 of 100 open-weight models · https://www.anchorterminal.com/tools/gpt-oss-120b.min.md
- gpt-oss-20b: B 69.9, rank #8 of 100 open-weight models · https://www.anchorterminal.com/tools/gpt-oss-20b.min.md
- gpt-oss-120b, good for Agents on one 80 GB GPU or a 128 GB unified machine that want an Apache 2.0 reasoning model with wide runtime support Ahead on Capability, 54 against 49; Risk, 95 against 85. Also Agent-ready, a grade of BB or better.
- gpt-oss-20b, good for Local agents on a 24 GB GPU or Mac that want a permissive licence, wide runtime support and documented structured output, one tool call at a time Ahead on Reach, 90 against 75.

| Category | gpt-oss-120b | gpt-oss-20b |
| --- | --- | --- |
| Capability (35%) | 54 | 49 |
| Reach (25%) | 75 | 90 |
| Risk (20%) | 95 | 85 |
| Agent interface (10%) | 90 | 90 |
| Documentation and upkeep (10%) | 45 | 42 |

| Fact (where they differ) | gpt-oss-120b | gpt-oss-20b |
| --- | --- | --- |