# Carbon-X vs Qwen3.5-4B (slim)

> Qwen3.5-4B and Carbon-X score within a point of each other for open-weight models you run yourself, 61.2 and 61 out of 100. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/carbon-x-vs-qwen3-5-4b.md (~5,800 tokens) · this version ~430 tokens · JSON https://www.anchorterminal.com/compare/carbon-x-vs-qwen3-5-4b.json · canonical https://www.anchorterminal.com/compare/carbon-x-vs-qwen3-5-4b
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-23
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

Qwen3.5-4B and Carbon-X score within a point of each other on agent readiness, 61.2 (C) and 61 (C). Carbon-X leads on reach, risk and documentation and upkeep. Both do open-weight models you run yourself.

- Carbon-X: C 61, rank #38 of 107 open-weight models · https://www.anchorterminal.com/tools/carbon-x.min.md
- Qwen3.5-4B: C 61.2, rank #34 of 107 open-weight models · https://www.anchorterminal.com/tools/qwen3-5-4b.min.md
- Carbon-X, good for Agents that need a second opinion on DNA variants and regulatory regions on a 16 to 24 GB machine, without sending sequences to a hosted model. Ahead on Reach, 90 against 85; Risk, 65 against 55; Documentation and upkeep, 77 against 34.
- Qwen3.5-4B, good for Agents that want a cheap local helper for tool calls, short reasoning and reading images on a laptop or small GPU Ahead on Agent interface, 70 against 35.

| Category | Carbon-X | Qwen3.5-4B |
| --- | --- | --- |
| Capability (35%) | pending | pending |
| Reach (25%) | 90 | 85 |
| Risk (20%) | 65 | 55 |
| Agent interface (10%) | 35 | 70 |
| Documentation and upkeep (10%) | 77 | 34 |

| Fact (where they differ) | Carbon-X | Qwen3.5-4B |
| --- | --- | --- |
| Vendor | Hugging Face (HuggingFaceBio) | Alibaba (Qwen team) |
| Last release | 2026-10-22 | 2026-03-02 |