Developer Tools & APIs
Claude Opus 4.1 is retired: what breaks on 5 August 2026 and how to fix it
The claude-opus-4-1-20250805 model ID retired on 5 August 2026. API calls to it now return a hard 404. Here is what to do.
Topic
Opus 4 1
3 posts about Opus 4 1 from Simon Carter.
Developer Tools & APIs
Claude Opus 4.1 retires on 5 August 2026: migrate to Opus 4.8 now
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.
Developer Tools & APIs
Anthropic is retiring Claude Opus 4.1 on August 5, 2026 — here's what developers need to do
Anthropic has deprecated claude-opus-4-1-20250805 with a retirement date of August 5, 2026. Opus 4.8 is the recommended replacement.