# Disruption with some GitHub services

- Provider: [GitHub](https://down.guide/github)
- Level: confirmed
- Impact: Degraded
- lasted 2h 15m
- started 2026-04-27 16:48 UTC
- id: DWN-3b6e605744
- Official page: https://stspg.io/sqvl4sp1cfgz

## Updates from GitHub
### 2026-04-27 16:48 UTC: investigating
We are investigating reports of impacted performance for some GitHub services.

### 2026-04-27 17:01 UTC: investigating
Copilot Cloud Agent (CCA) jobs using the Codex agent are failing after starting. To avoid this issue, please choose a different agent. We are investigating the cause and working towards remediation

### 2026-04-27 17:26 UTC: investigating
We've found the issue and are working on deploying a solution to get Codex agent runs working again.

### 2026-04-27 19:01 UTC: monitoring
The degradation has been mitigated. We are monitoring to ensure stability.

### 2026-04-27 19:02 UTC: resolved
On April 22, 2026 from 18:49 to 19:32 UTC , the Copilot Cloud Agent service began failing during session execution for users running the Agent HQ Codex agent. Codex agent sessions failed to start for all entry points (issue assignment, @copilot comment mentions). 0.5% of total Copilot Cloud Agent jobs were impacted (~2,000 failed jobs). Copilot and other agent sessions were unaffected.
This was caused by a model resolution mismatch in Codex agent sessions, resulting in an incompatible model being used at runtime. A mitigation was deployed to select a stable default model for Codex agent sessions.
We are working to harden the underlying model-resolution path so it correctly scopes to the requesting agent's supported models to prevent similar failure mode in the future.

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