Disruption with GPT 5.3 Codex
Final update
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.
Timeline
- Resolved · Jul 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.
More from GitHub
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|---|---|---|---|
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| Sep 1720:59 UTC | Elevated rate of errors for OpenAI models provided by Copilot | minor | 50m |
| Sep 1607:20 UTC | Degradation with Gemini 3.8 Flash | major | 10h 28m |
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Also caused by third-party dependency
All| Started | Vendor | Incident | Impact | Duration |
|---|---|---|---|---|
| Sep 1609:48 UTC |  DigitalOcean | Support Portal Service DisruptionDigitalOcean | minor | 11h 21m |
| Sep 1608:31 UTC |  Cloudflare | Support Helpdesk Availability IssuesCloudflare | minor | 6h 27m |
| Sep 417:03 UTC |  Grafana Labs | Degradation of Hosted Grafana in US Central RegionGrafana Labs | major | 3h 39m |
| Sep 416:05 UTC |  Expo | Elevated Linux worker queue timesExpo | major | 15h 4m |
| Sep 115:25 UTC | Grafana Labs | Investigating issues in US Central (prod-us-central-0, prod-us-central-5)Grafana Labs | minor | 4h 54m |
| Aug 3106:26 UTC |  Fly.io | Packet loss in ORDFly.io | minor | 1h 44m |
Sources: vendors' own status pages, published postmortems and SEC 8-K Item 1.05 filings, read daily. Times as reported. Logos via logo.dev; trademarks belong to their owners.