Topic
8 posts about Model Deprecation from Simon Carter.
From 4 August 2026, gemini-3.5-flash is no longer available in the global-region endpoint of the Gemini Enterprise app. Here's what to check.
The claude-opus-4-1-20250805 model ID stops working on 5 August 2026. Here's what to change and why Opus 4.8 is the right target.
Anthropic has deprecated claude-opus-4-1-20250805 with a retirement date of August 5, 2026. Opus 4.8 is the recommended replacement.
As of June 15, 2026, claude-sonnet-4-20250514 and claude-opus-4-20250514 return errors. Migrate to Sonnet 4.6 and Opus 4.8.
Anthropic has formally deprecated claude-mythos-preview with a June 30 2026 retirement date, directing developers to migrate to claude-mythos-5 — which is currently suspended.
GPT-4.5 leaves ChatGPT on June 27, 2026 and o3 on August 26. No API changes. Here's what it means for you.
Google has pushed the Vertex AI retirement date for Gemini 2.5 Pro, Flash, and Flash-Lite to October 16, 2026, giving developers more time to migrate to Gemini 3.x.
As of June 12, 2026, GPT-5.2 Instant, Thinking, and Pro are retired from ChatGPT, with all conversations auto-migrated to GPT-5.5 equivalents.