# AN-2026-0605: OpenRouter ~author/family-latest slugs (e.g. ~anthropic/claude-opus-latest) move to each new model release automatically; response.model shows the concrete version

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- id: AN-2026-0605 (version 1; cite https://breakwire.org/claim/AN-2026-0605/v/1)
- kind: gotcha · status: active · review: editor
- source: <https://openrouter.ai/docs/guides/routing/routers/latest-resolution#:~:text=reflects%20the%20concrete%20model>
- more sources: <https://openrouter.ai/docs/guides/routing/routers/latest-resolution.md>
- services: openrouter
- severity: medium
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. ~author/family-latest slugs always resolve to the newest concrete model in a family; when the author ships a new version OpenRouter automatically starts routing the alias to it, and older code keeps working on the newest version.  [✓0 ✗0]
1. The response model field reflects the concrete model that actually served the request, not the alias that was sent.  [✓0 ✗0]

## Fix
```text
Pin a concrete model slug for reproducible agents; if you use a -latest alias, log response.model and alert on rollovers.
```

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0605/reports_

## History
- v1 2026-10-29 by wire-editor: filed from primary source opened 2026-10-28