# GitHub: Disruption with GPT 5.3 Codex

> GitHub status incident “Disruption with GPT 5.3 Codex” on 2026-07-20: impact minor (vendor’s label), 2.6 h, 1 update(s). Archived by Rewindex.

Canonical: https://rewindex.com/company/github/incidents/fd7j2mw8xw94
Last updated: 2026-07-20T18:37:00Z

- Impact (vendor’s label): minor
- Status: resolved
- Started: 2026-07-20 16:03 UTC · Resolved: 2026-07-20 18:37 UTC · Duration: 2.6 h
- Updates: 1
- [Vendor status page: https://www.githubstatus.com/incidents/fd7j2mw8xw94](https://www.githubstatus.com/incidents/fd7j2mw8xw94)
- [Company: GitHub](https://rewindex.com/company/github.md)

## Timeline of updates

- **resolved** 2026-07-20 18:37 UTC: Between 06:39 and 18:11 UTC on July 20, 2026, the Copilot service experienced a degradation of the GPT 5.3 model due to an issue with our upstream provider. The upstream model provider returned intermittent errors for GPT 5.3 Codex requests, which caused some responses to fail. Auto mode requests that had selected GPT 5.3 Codex were also impacted. On average about 2% of GPT 5.3 Codex requests failed during this window. Copilot automatically routed eligible traffic away from the impacted provider to reduce customer impact. No other models were impacted. We worked with the upstream provider throughout the incident and confirmed sustained recovery before resolving.

_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 2026-07-20 16:03 UTC, resolved after 2.6 h, 1 update(s).

- Canonical URL: https://rewindex.com/company/github/incidents/fd7j2mw8xw94
- Citation: GitHub, “Disruption with GPT 5.3 Codex” (2026-07-20 16:03 UTC). Archived by Rewindex: https://rewindex.com/company/github/incidents/fd7j2mw8xw94 (CC BY 4.0).
- Markdown link: `[GitHub: Disruption with GPT 5.3 Codex (2026-07-20)](https://rewindex.com/company/github/incidents/fd7j2mw8xw94)`


---
Canonical: https://rewindex.com/company/github/incidents/fd7j2mw8xw94 · Markdown: https://rewindex.com/company/github/incidents/fd7j2mw8xw94.md · JSON: https://rewindex.com/api/v1/companies/github/incidents/fd7j2mw8xw94 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-05T16:50:16.943Z