Development ·
GitHub retires six Copilot models and names replacements
Gemini 3.7 Flash, four GPT model variants and Grok 4.5 were retired across most Copilot experiences.
Why it matters
Saved model choices and enterprise policies may need updating before existing coding workflows can continue with supported models.
What to watch
Check for surface-specific exceptions and verify replacement behavior on representative tasks.
Still uncertain. The notice covers most Copilot surfaces. Account policy and task-level behavior were not tested here.
Impact assessment reviewed 2026-10-20.
- Who it helps
- Developers and administrators maintaining Copilot workflows.
- Availability
- The change applies to most Copilot surfaces. Enterprise policy may need to permit a replacement before users can select it.
The replacement list
GitHub maps Gemini 3.7 Flash to 3.8 Flash; GPT-5.5 and GPT-5.4 to GPT-6.1 Sol; GPT-5.4 mini and GPT-5 mini to GPT-6 Luna; and Grok 4.5 to Grok 4.7.
A migration check
Identify affected saved model choices and verify a supported replacement is enabled. Repeat a representative task and compare its output before relying on the change.
What you can do
- Use GitHub’s retirement table to check the exact models and affected experiences in your workflow. Open reference ↗
Where the evidence stops
No account policy or model call was changed. This announcement concerns Copilot, and does not establish retirement at each original model provider.
Sources read. Sources checked October 20, 2026 UTC. No external product workflow, model training or inference was executed.
Sources & further reading
Web · official
October 19 Copilot model retirements ↗
Publisher-owned announcement or help page establishing the dated change, current access or stated operating constraints.
GitHub · page checked 2026-10-20 · Published 2026-10-19
Coverage note: The source bundle is a bounded sample. Independent replications and matching original discussion across all platforms were not established.
The record over time (1)
Dated source checks and published explanations. An observation date can differ from the original release date.
- · Added to Current
2026-10-19: Gemini 3.7 Flash, four GPT model variants and Grok 4.5 were retired across most Copilot experiences.
Assessment: Saved model choices and enterprise policies may need updating before existing coding workflows can continue with supported models.