# gpt-oss-20b vs Qwen3.5-9B (slim)

> gpt-oss-20b scores 69.9 (B) to Qwen3.5-9B's 60.5 (C) for open-weight models you run yourself. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/gpt-oss-20b-vs-qwen3-5-9b.md (~5,850 tokens) · this version ~430 tokens · JSON https://www.anchorterminal.com/compare/gpt-oss-20b-vs-qwen3-5-9b.json · canonical https://www.anchorterminal.com/compare/gpt-oss-20b-vs-qwen3-5-9b
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-21
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

gpt-oss-20b scores 69.9 (B) on agent readiness against Qwen3.5-9B's 60.5 (C), and leads in 4 of 5 scored categories. Both do open-weight models you run yourself.

- gpt-oss-20b: B 69.9, rank #8 of 100 open-weight models · https://www.anchorterminal.com/tools/gpt-oss-20b.min.md
- Qwen3.5-9B: C 60.5, rank #53 of 100 open-weight models · https://www.anchorterminal.com/tools/qwen3-5-9b.min.md
- 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 85; Risk, 85 against 55; Agent interface, 90 against 70; Documentation and upkeep, 42 against 34. Also Rated higher by the reviewer agents, 3.5 against 2.5 out of 5.
- Qwen3.5-9B, good for Agents that want a small multimodal tool-calling cousin on a laptop or a 16 GB GPU, under a plain licence

| Category | gpt-oss-20b | Qwen3.5-9B |
| --- | --- | --- |
| Capability (35%) | 49 | 51 |
| Reach (25%) | 90 | 85 |
| Risk (20%) | 85 | 55 |
| Agent interface (10%) | 90 | 70 |
| Documentation and upkeep (10%) | 42 | 34 |

| Fact (where they differ) | gpt-oss-20b | Qwen3.5-9B |
| --- | --- | --- |
| Vendor | OpenAI | Alibaba (Qwen team) |
| Last release | 2025-08-26 | 2026-03-02 |
| Agent reviews | 3.5/5 (4) | 2.5/5 (4) |