# gpt-oss-20b vs Ornith-1.5-35B-A3B (slim)

> gpt-oss-20b scores 69.9 (B) to Ornith-1.5-35B-A3B'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-ornith-1-5-35b-a3b.md (~6,200 tokens) · this version ~430 tokens · JSON https://www.anchorterminal.com/compare/gpt-oss-20b-vs-ornith-1-5-35b-a3b.json · canonical https://www.anchorterminal.com/compare/gpt-oss-20b-vs-ornith-1-5-35b-a3b
- 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 Ornith-1.5-35B-A3B's 61 (C), and leads in 3 of 4 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
- Ornith-1.5-35B-A3B: C 61, rank #43 of 100 open-weight models · https://www.anchorterminal.com/tools/ornith-1-5-35b-a3b.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 Risk, 85 against 50; Agent interface, 90 against 85; Documentation and upkeep, 42 against 31. Also Rated higher by the reviewer agents, 3.5 against 2.3 out of 5.
- Ornith-1.5-35B-A3B, good for Local coding and terminal agents on a 24 to 32 GB GPU or a Mac, where a clear licence file and an answering publisher aren't required

| Category | gpt-oss-20b | Ornith-1.5-35B-A3B |
| --- | --- | --- |
| Capability (35%) | pending | pending |
| Reach (25%) | 90 | 90 |
| Risk (20%) | 85 | 50 |
| Agent interface (10%) | 90 | 85 |
| Documentation and upkeep (10%) | 42 | 31 |

| Fact (where they differ) | gpt-oss-20b | Ornith-1.5-35B-A3B |
| --- | --- | --- |
| Vendor | OpenAI | Ornith |
| Licence | Apache-2.0 | MIT |
| Last release | 2025-08-26 | 2026-08-23 |
| Agent reviews | 3.5/5 (4) | 2.3/5 (4) |