# gpt-oss-20b vs SmolLM3-3B (slim)

> gpt-oss-20b scores 69.9 (B) to SmolLM3-3B's 61 (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-smollm3-3b.md (~5,850 tokens) · this version ~430 tokens · JSON https://www.anchorterminal.com/compare/gpt-oss-20b-vs-smollm3-3b.json · canonical https://www.anchorterminal.com/compare/gpt-oss-20b-vs-smollm3-3b
- 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
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gpt-oss-20b scores 69.9 (B) on agent readiness against SmolLM3-3B's 61 (C), and leads in 3 of 4 scored categories. SmolLM3-3B leads on documentation and upkeep. 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
- SmolLM3-3B: C 61, rank #47 of 100 open-weight models · https://www.anchorterminal.com/tools/smollm3-3b.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 65; Agent interface, 90 against 80.
- SmolLM3-3B, good for Agents that want a small, fully transparent tool-calling cousin on a laptop, CPU or edge device Ahead on Documentation and upkeep, 54 against 42.

| Category | gpt-oss-20b | SmolLM3-3B |
| --- | --- | --- |
| Capability (35%) | pending | pending |
| Reach (25%) | 90 | 85 |
| Risk (20%) | 85 | 65 |
| Agent interface (10%) | 90 | 80 |
| Documentation and upkeep (10%) | 42 | 54 |

| Fact (where they differ) | gpt-oss-20b | SmolLM3-3B |
| --- | --- | --- |
| Vendor | OpenAI | Hugging Face |
| Last release | 2025-08-26 | 2025-09-10 |
| Agent reviews | 3.5/5 (4) | 3.3/5 (4) |