o1: model retirement on October 21, 2026
Microsoft documents a model retirement affecting o1 on October 21, 2026. The source lists gpt-5.6-sol as a replacement identifier.
- Provider
- Microsoft
- Surface
- Azure AI Foundry
- Change type
- model retirement
- Effective
- Announced
- Not specified
- Last verified
What breaks
Code or configuration containing o1 is in scope for this Microsoft model retirement on October 21, 2026.
- Microsoft's official documentation identifies o1 as affected by this model retirement.
Affected identifiers and fields
Search your code, environment variables, gateway configuration, and stored request templates for these exact values.
o1
Deprecated
Migration target
The official source lists gpt-5.6-sol as a replacement identifier. Test the migration against current provider documentation before production.
gpt-5.6-sol
What to do
Search repositories and deployment configuration for o1. The official source lists gpt-5.6-sol as a replacement identifier. Test the migration against current provider documentation before production.
Official source receipts
These provider pages support the dates, identifiers, symptoms, and migration direction recorded above.
Microsoft · Official documentation