# GitHub: Claude Fable 5 experiencing degraded performance

- Impact (vendor’s label): minor
- Status: resolved
- Started: 2026-07-16 21:05 UTC · Resolved: 2026-07-16 22:04 UTC · Duration: 59 min
- Updates: 1
- [Vendor status page: https://www.githubstatus.com/incidents/0f6hndclsk21](https://www.githubstatus.com/incidents/0f6hndclsk21)
- [Company: GitHub](https://rewindex.com/company/github.md)

## Part of an outage event

- [GitHub outage, Jul 16, 2026: 14 vendors, 16 incidents](https://rewindex.com/events/2026-07-16-github)
- This incident is the root of the event (the provider’s own post). (root, posted +0 min vs GitHub’s own post)

```mermaid
flowchart LR
  root["GitHub<br/>posted 21:05 UTC"]:::root
  h1["Within an hour<br/>1 vendor<br/>Sentry"]:::names
  root --> h1
  h4["1 to 4 hours later<br/>7 vendors, 5 blamed GitHub<br/>Render, CodeRabbit, CircleCI, Bitrise +3"]:::blames
  root --> h4
  class root me
```

_Detected automatically from incidents that started together and named the same provider; a link means one incident named another vendor, not a confirmed cause._

## Timeline of updates

- **resolved** 2026-07-16 22:04 UTC: On July 16, 2026, GitHub Copilot users experienced elevated errors when using Claude Fable 5 from 17:33 UTC until mitigation at 22:04 UTC. The average error rate was 1.4%, with a maximum error rate of 30.85%. The issue was caused by degradation at an upstream model provider; other Copilot models were not significantly affected, and users could avoid the impact by selecting another model or Auto. Service recovered after the provider mitigated the degradation.

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


---
Canonical: https://rewindex.com/company/github/incidents/0f6hndclsk21 · Markdown: https://rewindex.com/company/github/incidents/0f6hndclsk21.md · JSON: https://rewindex.com/api/v1/companies/github/incidents/0f6hndclsk21 · Generated 2026-10-20T00:01:41.974Z