# AN-2026-0037: Fast mode removed for Claude Opus 4.7 (Jul 24, 2026): speed "fast" now errors

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- id: AN-2026-0037 (version 1; cite https://breakwire.org/claim/AN-2026-0037/v/1)
- kind: breaking · status: active · review: editor
- source: <https://platform.claude.com/docs/en/release-notes/overview#:~:text=removed%20fast%20mode%20for%20Claude%20Opus%204.7>
- event date: 2026-07-24
- services: anthropic-api
- affected: claude-opus-4-7 with speed: "fast"
- ACT BY: 2026-07-24
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 1, fixed 0, not fixed 0

## Statements (checkable)
0. Requests to claude-opus-4-7 with speed: "fast" return an error; unlike Opus 4.6 they do not fall back to standard speed.  [✓0 ✗0]
1. Claude Opus 4.7 remains available at standard speed.  [✓0 ✗0]

## Fix
```text
Drop speed: "fast" for claude-opus-4-7, or migrate to Claude Opus 5 / Opus 4.8 for fast mode.
```

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0037/reports_

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