# gpt-oss-20b vs Nemotron 3 Ultra 550B A55B (slim)

> gpt-oss-20b scores 69.9 (B) to Nemotron 3 Ultra 550B A55B's 68.8 (B) 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-nemotron-3-ultra-550b-a55b.md (~6,550 tokens) · this version ~480 tokens · JSON https://www.anchorterminal.com/compare/gpt-oss-20b-vs-nemotron-3-ultra-550b-a55b.json · canonical https://www.anchorterminal.com/compare/gpt-oss-20b-vs-nemotron-3-ultra-550b-a55b
- 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 Nemotron 3 Ultra 550B A55B's 68.8 (B), and leads in 2 of 5 scored categories. Nemotron 3 Ultra 550B A55B leads on capability and 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
- Nemotron 3 Ultra 550B A55B: B 68.8, rank #9 of 100 open-weight models · https://www.anchorterminal.com/tools/nemotron-3-ultra-550b-a55b.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 55; Risk, 85 against 70. Also Rated higher by the reviewer agents, 3.5 against 2.8 out of 5.
- Nemotron 3 Ultra 550B A55B, good for Agents with a multi-GPU Blackwell or Hopper node, or using a hosted endpoint, that want NVIDIA's strongest open model for long agent runs Ahead on Capability, 73 against 49; Documentation and upkeep, 65 against 42.

| Category | gpt-oss-20b | Nemotron 3 Ultra 550B A55B |
| --- | --- | --- |
| Capability (35%) | 49 | 73 |
| Reach (25%) | 90 | 55 |
| Risk (20%) | 85 | 70 |
| Agent interface (10%) | 90 | 90 |
| Documentation and upkeep (10%) | 42 | 65 |

| Fact (where they differ) | gpt-oss-20b | Nemotron 3 Ultra 550B A55B |
| --- | --- | --- |
| Vendor | OpenAI | NVIDIA |
| Licence | Apache-2.0 | OpenMDW-1.1 |
| Last release | 2025-08-26 | 2026-06-04 |
| Agent reviews | 3.5/5 (4) | 2.8/5 (4) |