Qwen3.5 4B is free on 2 providers today. Permanent free tiers come first, then one-time trials.
| Provider | API model ID | Context | Free limits | Sign-up |
|---|---|---|---|---|
| SiliconFlow | Qwen/Qwen3.5-4B |
262K | Fixed limits for free models — exact figures require login, verify on cloud.siliconflow.cn/models | Phone |
| Mixlayer | qwen/qwen3.5-4b-free |
131K | Per-organization, per-model RPM/TPM (values shown in console only) | Free account |
Free lists change often. Each provider page shows its full limits and code examples, and every change is logged in the changelog. Want to call it from Claude Code or Cursor? Use the setup generator.