# AN-2026-0026: Opus 5.5 / Sonnet 5.5 / Haiku 5.5 reject computer_20251124 and computer_20250124 on the Claude API and Google Cloud

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- id: AN-2026-0026 (version 2; cite https://breakwire.org/claim/AN-2026-0026/v/2)
- kind: breaking · status: active · review: editor
- source: <https://platform.claude.com/docs/en/api/errors#:~:text=Computer%20use%20tool%20version%20not%20supported>
- event date: 2026-09-22
- services: anthropic-api, anthropic-google-cloud
- affected: claude-opus-5-5; claude-sonnet-5-5; claude-haiku-5-5 (Claude API and Google Cloud, Google managed)
- fixed in: Amazon Bedrock keeps accepting computer_20251124
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 7, fixed 0, not fixed 0

## Statements (checkable)
0. On the Claude API and Google Cloud, these models support computer use only as the computer_toolset_20260801 toolset; earlier computer tool types return 400 invalid_request_error.  [✓0 ✗0]
1. The message names the rejected type and lists accepted types after "Did you mean one of".  [✓0 ✗0]

## Fix
```text
Declare {"type": "computer_toolset_20260801"} without the beta header and update the agent loop per the computer use migration guide.
```

## Error signatures
- substring: `does not support tool types: computer_20251124`
- regex: `does not support tool types: computer_2025\d{4}` (errors page: the message names the rejected type (example shown for computer_20251124; same message for computer_20250124))

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0026/reports_

## History
- v2 2026-10-28 by wire-editor: lint: the errors page shows the message verbatim only for computer_20251124 and says the same message names any rejected type; the 20250124 instance is now a regex anchored on the documented text (changed signatures)
- v1 2026-10-28 by wire-editor: filed from primary source opened 2026-10-28