# Qwen3-4B-Instruct-2507 vs Qwen3.5-4B (slim)

> Qwen3.5-4B scores 61.2 (C) to Qwen3-4B-Instruct-2507's 55.7 (C) for open-weight models you run yourself. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/qwen3-4b-instruct-2507-vs-qwen3-5-4b.md (~6,250 tokens) · this version ~430 tokens · JSON https://www.anchorterminal.com/compare/qwen3-4b-instruct-2507-vs-qwen3-5-4b.json · canonical https://www.anchorterminal.com/compare/qwen3-4b-instruct-2507-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: 2026-10-21
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

Qwen3.5-4B scores 61.2 (C) on agent readiness against Qwen3-4B-Instruct-2507's 55.7 (C), and leads in 2 of 5 scored categories. Qwen3-4B-Instruct-2507 leads on reach and agent interface. Both do open-weight models you run yourself.

- Qwen3-4B-Instruct-2507: C 55.7, rank #77 of 100 open-weight models · https://www.anchorterminal.com/tools/qwen3-4b-instruct-2507.min.md
- Qwen3.5-4B: C 61.2, rank #33 of 100 open-weight models · https://www.anchorterminal.com/tools/qwen3-5-4b.min.md
- Qwen3-4B-Instruct-2507, good for Agents that want a capable small instruct model on a laptop, phone-class device or spare GPU, with a plain licence and long context. Ahead on Reach, 95 against 85; Agent interface, 75 against 70.
- 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 Capability, 53 against 31; Documentation and upkeep, 34 against 26.

| Category | Qwen3-4B-Instruct-2507 | Qwen3.5-4B |
| --- | --- | --- |
| Capability (35%) | 31 | 53 |
| Reach (25%) | 95 | 85 |
| Risk (20%) | 55 | 55 |
| Agent interface (10%) | 75 | 70 |
| Documentation and upkeep (10%) | 26 | 34 |

| Fact (where they differ) | Qwen3-4B-Instruct-2507 | Qwen3.5-4B |
| --- | --- | --- |
| Last release | 2025-09-17 | 2026-03-02 |