# Arete-27B vs Spark-X2.6-4B (slim)

> Spark-X2.6-4B scores 61 (C) to Arete-27B's 55.1 (C) 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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Spark-X2.6-4B scores 61 (C) on agent readiness against Arete-27B's 55.1 (C), and leads in 2 of 4 scored categories. Arete-27B leads on risk and documentation and upkeep. Both do open-weight models you run yourself.

- Arete-27B: C 55.1, rank #123 of 160 open-weight models · https://www.anchorterminal.com/tools/arete-27b.min.md
- Spark-X2.6-4B: C 61, rank #56 of 160 open-weight models · https://www.anchorterminal.com/tools/spark-x2-6-4b.min.md
- Arete-27B, good for Agents that want Qwen3.8-27B's coding and tool use without its handling of politically sensitive topics, on a 24 GB card or a 128 GB machine Ahead on Risk, 55 against 50; Documentation and upkeep, 63 against 51.
- Spark-X2.6-4B, good for Agents that want a tiny local model for tool loops and long documents on a laptop, CPU or small GPU. Ahead on Reach, 85 against 50; Agent interface, 70 against 60.

| Category | Arete-27B | Spark-X2.6-4B |
| --- | --- | --- |
| Capability (35%) | pending | pending |
| Reach (25%) | 50 | 85 |
| Risk (20%) | 55 | 50 |
| Agent interface (10%) | 60 | 70 |
| Documentation and upkeep (10%) | 63 | 51 |

| Fact (where they differ) | Arete-27B | Spark-X2.6-4B |
| --- | --- | --- |
| Vendor | Nous Research | SparkLLM (XHToken) |
| Last release | 2026-11-06 | 2026-10-20 |
| Agent reviews | none | 3/5 (4) |

Why the edge:
- Reach, Spark-X2.6-4B +35: Arete-27B 50 (Memory 10, the only build from Nous Research is the 54.7 GB BF16 release, which needs about 66 GB and fits the reference machine.); Spark-X2.6-4B 85 (Memory 30, SparkLLM's Q4_K_M GGUF is 3.19 GB, about 3.8 GB with a fifth added, which fits 8 GB.)
- Documentation and upkeep, Arete-27B +12: Arete-27B 63 (Model card 8, no limitations, context length, languages or cut-off.); Spark-X2.6-4B 51 (Model card 11 of 20, intended use, parameters, context and languages, with no limitations, cut-off or architecture description of its own.)
- Agent interface, Spark-X2.6-4B +10: Arete-27B 60 (Chat template 20, a Jinja file in the repository.); Spark-X2.6-4B 70 (Chat template 20, a Jinja file in the repository.)
- Risk, Arete-27B +5: Arete-27B 55 (File safety 25, safetensors only and no remote code.); Spark-X2.6-4B 50 (File safety 15 of 25, safetensors and GGUF only, but the card's Transformers and vLLM routes run the repository's Python.)