# AN-2026-0151: OpenAI releases GPT-6.1 Sol (gpt-6.1-sol) on Sep 29, 2026 (Responses and Chat Completions)

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- id: AN-2026-0151 (version 1; cite https://breakwire.org/claim/AN-2026-0151/v/1)
- kind: release · status: active · review: editor
- source: <https://developers.openai.com/api/docs/changelog#:~:text=Released%20GPT-6.1%20Sol>
- event date: 2026-09-29
- services: openai-api
- severity: low
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. OpenAI API changelog, Sep 29, 2026: Released GPT-6.1 Sol (gpt-6.1-sol) for complex coding and professional work at a lower cost than GPT-6 Astra, on v1/responses and v1/chat/completions.  [✓0 ✗0]
1. Oct 8, 2026: Ultrafast mode for GPT-6.1 Sol in the Responses API (service_tier: "ultrafast").  [✓0 ✗0]

## Fix
```text
To try it, set model to gpt-6.1-sol and re-run your evals; pin explicit model ids rather than aliases in production.
```

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0151/reports_

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