Claude Fable 5 experiencing degraded performance

What to do

• Check whether you use GitHub Copilot AI Model Providers. Check your stack

  Paste a package.json, lockfile, Terraform or a list of domains at down.guide/stack to see every provider you depend on.

• Confirm your retries, queues and scheduled jobs caught up after the 59m it lasted.

  Anything that failed between 2026-07-16 21:05 UTC and 2026-07-16 22:04 UTC may need a replay.

• Subscribe to GitHub's feed to hear about the next one first. RSS feed

  https://down.guide/feed?provider=github works in Slack (/feed subscribe), Discord feed bots and any RSS reader.

Updates from GitHub 3

1. investigatingJul 16, 2026, 9:05 PM UTC

   We are investigating reports of degraded performance for Copilot AI Model Providers

   provider

2. investigatingJul 16, 2026, 9:06 PM UTC

   We are experiencing degraded availability for the Claude Fable 5 model in Copilot products and IDE surfaces. This is due to an issue with an upstream model provider. While we work with them to resolve the issue, we recommend choosing another model or selecting 'Auto' to continue using Copilot.

   provider

3. resolvedJul 16, 2026, 10:04 PM 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.

   provider

Corrections

None so far.

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