Degraded availability GPT 5.6 Luna
This summary is created by Generative AI and may differ from the actual content.
Overview
GPT-5.6 Luna model in GitHub Copilot experienced degraded availability in intermittent intervals between approximately 08:05 UTC and 16:30 UTC on August 1st, 2026. Requests frequently failed or timed out during four specific timeframes: 10:00-10:20 UTC, 10:45-11:50 UTC, 13:00-14:25 UTC, and 16:00-16:30 UTC. The issue was caused by an outage at an upstream model provider. Other Copilot models remained unaffected, and users could continue working by selecting alternative models or 'Auto'. Full availability was restored once the provider resolved their outage at 16:30 UTC.
Impact
Degraded availability for GPT-5.6 Luna model affecting Copilot chat and IDE surfaces. Requests frequently failed or timed out during the incident window. No quantified metrics on number of affected users or failed requests were provided in the postmortem.
Trigger
An issue with an upstream model provider caused the degraded availability of GPT-5.6 Luna.
Detection
Investigation began at 11:16 UTC when reports of degraded performance for Copilot AI Model Providers were received. Status updates were communicated starting at 11:20 UTC.
Resolution
Mitigation was provided by recommending users select an alternative model or 'Auto' to continue using Copilot while the upstream provider worked to resolve their outage. Full resolution occurred when the upstream model provider resolved their outage at 16:30 UTC. Continued monitoring was maintained to ensure stability post-recovery.
Root Cause
An outage at an upstream model provider caused the degraded availability of the GPT-5.6 Luna model in GitHub Copilot.