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## Problem
Sentry is reporting an `AI_APICallError` on the AI proxy path:
> This model is unavailable for free. The paid version is available now
- use this slug instead: `z-ai/glm-4.5-air`
OpenRouter discontinued the **free** tier for GLM 4.5 Air. The model
selection matrix still pinned the `:free` variant for the **dumb / slow
/ authenticated** path, so every request routed there fails.
## Fix
Drop the `:free` suffix in `apps/backend/src/lib/ai/models.ts` so it
uses the paid slug OpenRouter recommends:
```diff
- authenticated: { modelId: "z-ai/glm-4.5-air:free" },
+ authenticated: { modelId: "z-ai/glm-4.5-air" },
```
`ALLOWED_MODEL_IDS` is derived from the matrix, so the new slug is
picked up automatically.
## Notes
- This was the only `:free` slug in the matrix; nothing else is exposed
to the same break.
- This moves a previously-free path onto paid inference (cheap model,
but no longer $0).
<!-- This is an auto-generated description by cubic. -->
---
## Summary by cubic
Switch the dumb/slow/authenticated path to the paid `z-ai/glm-4.5-air`
slug, replacing the retired `:free` variant to stop “This model is
unavailable for free” errors. Restores successful requests after
OpenRouter ended the free tier.
- **Bug Fixes**
- Updated model matrix in apps/backend/src/lib/ai/models.ts to use
`z-ai/glm-4.5-air`; `ALLOWED_MODEL_IDS` picks up the new slug
automatically.
<sup>Written for commit
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