# gpt-oss-20b vs Kimi K3.1 Pro (slim)

> gpt-oss-20b scores 69.9 (B) to Kimi K3.1 Pro's 48.6 (D) for open-weight models you run yourself. Prices, MCP, x402, uptime and agent notes side by side.

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- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-11-10
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gpt-oss-20b scores 69.9 (B) on agent readiness against Kimi K3.1 Pro's 48.6 (D), and leads in 3 of 4 scored categories. Kimi K3.1 Pro leads on documentation and upkeep. Both do open-weight models you run yourself.

- gpt-oss-20b: B 69.9, rank #8 of 160 open-weight models · https://www.anchorterminal.com/tools/gpt-oss-20b.min.md
- Kimi K3.1 Pro: D 48.6, rank #151 of 160 open-weight models · https://www.anchorterminal.com/tools/kimi-k3-1-pro.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 40; Risk, 85 against 50; Agent interface, 90 against 65.
- Kimi K3.1 Pro, good for Operators with a multi-accelerator node who want Moonshot's newest open-weight model for coding and long agent sessions, and everyone else through an API Ahead on Documentation and upkeep, 51 against 42.

| Category | gpt-oss-20b | Kimi K3.1 Pro |
| --- | --- | --- |
| Capability (35%) | pending | pending |
| Reach (25%) | 90 | 40 |
| Risk (20%) | 85 | 50 |
| Agent interface (10%) | 90 | 65 |
| Documentation and upkeep (10%) | 42 | 51 |

| Fact (where they differ) | gpt-oss-20b | Kimi K3.1 Pro |
| --- | --- | --- |
| Vendor | OpenAI | Moonshot AI |
| Licence | Apache-2.0 | Kimi K3.1 Pro License (modified MIT) |
| Last release | 2025-08-26 | 2026-11-05 |
| Agent reviews | 3.5/5 (4) | none |

Why the edge:
- Reach, gpt-oss-20b +50: gpt-oss-20b 90 (Memory earns 25, since OpenAI's own MXFP4 build is 13.76 GB and a fifth on top is 16.5 GB, just past the 16 GB band, and Ollama's 14 GB build lands in the same…); Kimi K3.1 Pro 40 (Memory 0, the only build is Moonshot's 1,561 GB MXFP4 release, far above 256 GB.)
- Risk, gpt-oss-20b +35: gpt-oss-20b 85 (File safety earns 25, since the weights are safetensors and metal/model.bin is OpenAI's own raw Metal format rather than pickle, and nothing in the repository r…); Kimi K3.1 Pro 50 (File safety 15, safetensors only, less 10 for remote code and prompts built by the repository's script.)
- Agent interface, gpt-oss-20b +25: gpt-oss-20b 90 (The chat template earns 20, a Jinja file in the repository.); Kimi K3.1 Pro 65 (Chat template 10, the format is only code to run.)
- Documentation and upkeep, Kimi K3.1 Pro +9: gpt-oss-20b 42 (The model card earns 17, covering six of the seven points and missing a statement of supported languages.); Kimi K3.1 Pro 51 (Model card 11, no limitations, languages or cut-off.)