---
id: "INC-github-24t8gsgqx2qb"
kind: "incident"
aliases: []
title: "GitHub: Errors with the Fable 5 Model in Copilot"
severity: "medium"
cvss: null
epss: null
exploited: false
status: "resolved"
category: "vendor"
products: [{"name": "GitHub", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["ci", "git", "github", "incident", "ops", "vendor"]
not_affected_if: []
published_at: "2026-08-13T14:43:25+00:00"
first_seen_at: "2026-10-23T19:12:22+00:00"
updated_at: "2026-10-23T21:55:04+00:00"
sources: [{"source": "statuspage", "url": "https://stspg.io/8htrnxk0q09v", "first_seen_at": "2026-10-23T19:12:22+00:00"}]
---

# GitHub: Errors with the Fable 5 Model in Copilot

## Affected

- vendor:GitHub affected ? fixed ?

## Timeline

- 2026-10-23T19:12:22+00:00 statuspage https://stspg.io/8htrnxk0q09v

## From the sources

On August 13th, 2026, between approximately 14:06 and 15:47 UTC, the Copilot service experienced a degradation of the Claude Fable 5 model due to an issue with our upstream provider. Users encountered elevated error rates, peaking at 43% and averaging 12%. Users who selected Auto or alternative models were unaffected.The issue was resolved by a mitigation put in place by our provider. GitHub is working with our provider to further improve the resiliency of the service to prevent similar incidents in the future.

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