# GitHub: Incident with Copilot GPT-5.1-Codex

> GitHub status incident “Incident with Copilot GPT-5.1-Codex” on 2026-02-20: impact minor (vendor’s label), 1.6 h, 1 update(s). Archived by Rewindex.

Canonical: https://rewindex.com/company/github/incidents/8qvx6hqk3nz0
Last updated: 2026-02-20T11:41:00Z

- Impact (vendor’s label): minor
- Status: resolved
- Started: 2026-02-20 10:02 UTC · Resolved: 2026-02-20 11:41 UTC · Duration: 1.6 h
- Updates: 1
- [Vendor status page: https://www.githubstatus.com/incidents/8qvx6hqk3nz0](https://www.githubstatus.com/incidents/8qvx6hqk3nz0)
- [Company: GitHub](https://rewindex.com/company/github.md)

## Timeline of updates

- **resolved** 2026-02-20 11:41 UTC: On February 20, 2026, between 07:30 UTC and 11:21 UTC, the Copilot service experienced a degradation of the GPT 5.1 Codex model. During this time period, users encountered a 4.5% error rate when using this model. No other models were impacted. The issue was resolved by a mitigation put in place by the external model provider. GitHub is working with the external model provider to further improve the resiliency of the service to prevent similar incidents in the future.

_From the vendor’s published history: only the final update text is available for incidents before Rewindex began polling this page._

## Cite this

Status incident (vendor impact label: minor) posted by GitHub, started 2026-02-20 10:02 UTC, resolved after 1.6 h, 1 update(s).

- Canonical URL: https://rewindex.com/company/github/incidents/8qvx6hqk3nz0
- Citation: GitHub, “Incident with Copilot GPT-5.1-Codex” (2026-02-20 10:02 UTC). Archived by Rewindex: https://rewindex.com/company/github/incidents/8qvx6hqk3nz0 (CC BY 4.0).
- Markdown link: `[GitHub: Incident with Copilot GPT-5.1-Codex (2026-02-20)](https://rewindex.com/company/github/incidents/8qvx6hqk3nz0)`


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Canonical: https://rewindex.com/company/github/incidents/8qvx6hqk3nz0 · Markdown: https://rewindex.com/company/github/incidents/8qvx6hqk3nz0.md · JSON: https://rewindex.com/api/v1/companies/github/incidents/8qvx6hqk3nz0 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-04T17:55:48.311Z