GitHub Copilot: Claude Fable 5 experiencing degraded performance

MinorStatus: resolvedStarted 2026-07-16 21:05 UTCResolved 2026-07-16 22:04 UTC (59 min)1 updatewww.githubstatus.com

Part of an outage event

GitHub outage, Jul 16, 2026 · 10 vendors, 12 incidents

GitHub Copilot’s incident is the root of the event (the provider’s own post). (root, posted +0 min vs GitHub’s own post)

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GitHub Copilot is outlined in red. Groups show up to a few vendors each; the event page lists every incident.

Mermaid source

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

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Detected automatically from incidents that started together and named the same provider. A link means one vendor’s incident named another, not a confirmed cause.

Timeline of updates

resolved2026-07-16 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 GitHub Copilot’s published incident history: for incidents before Rewindex began polling this status page, only the final update text is available.

Archive proof

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This incident predates live tracking (October 17, 2026). It came from the vendor’s own published history, which is not covered by checkpoints.

Impact, status and times are the vendor’s own, as last archived. View on www.githubstatus.com (opens in new tab).

Cite this

Status incident (vendor impact label: minor) posted by GitHub Copilot, started 2026-07-16 21:05 UTC, resolved after 59 min, 1 update(s).

Title: Claude Fable 5 experiencing degraded performance
Vendor: GitHub Copilot
Date: 2026-07-16 21:05 UTC
URL: https://rewindex.com/company/github-copilot/incidents/0f6hndclsk21

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