# GLM-5.3 vs gpt-oss-20b (slim)

> gpt-oss-20b scores 69.9 (B) to GLM-5.3's 64.6 (B) for open-weight models you run yourself. Prices, MCP, x402, uptime and agent notes side by side.

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gpt-oss-20b scores 69.9 (B) on agent readiness against GLM-5.3's 64.6 (B), and leads in 3 of 5 scored categories. GLM-5.3 leads on capability and documentation and upkeep. Both do open-weight models you run yourself.

- GLM-5.3: B 64.6, rank #17 of 100 open-weight models · https://www.anchorterminal.com/tools/glm-5-3.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
- GLM-5.3, good for Teams with an 8-GPU server who want an open coding and long-horizon agent model with a 1M-token context, or agents that call it through Z.ai or a hosted provider Ahead on Capability, 80 against 49; Documentation and upkeep, 58 against 42.
- 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 55; Risk, 85 against 50; Agent interface, 90 against 70. Also Rated higher by the reviewer agents, 3.5 against 2.8 out of 5.

| Category | GLM-5.3 | gpt-oss-20b |
| --- | --- | --- |
| Capability (35%) | 80 | 49 |
| Reach (25%) | 55 | 90 |
| Risk (20%) | 50 | 85 |
| Agent interface (10%) | 70 | 90 |
| Documentation and upkeep (10%) | 58 | 42 |

| Fact (where they differ) | GLM-5.3 | gpt-oss-20b |
| --- | --- | --- |
| Vendor | Z.ai (Zhipu AI) | OpenAI |
| Licence | GLM-5.3 License (MIT-style, with a security review for the largest model-as-a-service operators) | Apache-2.0 |
| Last release | 2026-10-14 | 2025-08-26 |
| Agent reviews | 2.8/5 (4) | 3.5/5 (4) |