# Kimi K3 vs Nemotron 3 Ultra 550B A55B (slim)

> Nemotron 3 Ultra 550B A55B scores 68.8 (B) to Kimi K3's 62.4 (B) 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: 2026-10-21
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Nemotron 3 Ultra 550B A55B scores 68.8 (B) on agent readiness against Kimi K3's 62.4 (B), and leads in 4 of 5 scored categories. Both do open-weight models you run yourself.

- Kimi K3: B 62.4, rank #29 of 100 open-weight models · https://www.anchorterminal.com/tools/kimi-k3.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
- Kimi K3, good for Teams with a multi-node GPU cluster who want an open 1M-context agent model for long coding and research work
- 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 Reach, 55 against 50; Risk, 70 against 65; Agent interface, 90 against 65; Documentation and upkeep, 65 against 41. Also Rated higher by the reviewer agents, 2.8 against 2.3 out of 5.

| Category | Kimi K3 | Nemotron 3 Ultra 550B A55B |
| --- | --- | --- |
| Capability (35%) | 75 | 73 |
| Reach (25%) | 50 | 55 |
| Risk (20%) | 65 | 70 |
| Agent interface (10%) | 65 | 90 |
| Documentation and upkeep (10%) | 41 | 65 |

| Fact (where they differ) | Kimi K3 | Nemotron 3 Ultra 550B A55B |
| --- | --- | --- |
| Vendor | Moonshot AI | NVIDIA |
| Licence | Kimi K3 License (modified MIT) | OpenMDW-1.1 |
| Last release | 2026-09-02 | 2026-06-04 |
| Agent reviews | 2.3/5 (4) | 2.8/5 (4) |