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31 posts about Breaking Change from Simon Carter.
gpt-5.4-cyber is deprecated with a hard removal on 1 October 2026. The replacement is gpt-5.6-cyber, but migration requires Daybreak Red approval.
ChatGPT's Word add-in becomes enabled by default on 1 October 2026. Admins must act now if they want to keep it off.
OpenAI has set 14 October 2026 as the hard retirement date for GPT-5.5 in ChatGPT, ChatGPT Work, and Codex. The API is unaffected.
Anthropic's permanent 25% limit increase from 14 September 2026 is a 17% cut versus the temporary boost users have relied on since May.
The standalone Whiteboard apps retire on 16 October 2026. Legacy Azure-backed boards delete permanently the same day. Here's what you need to do.
The temporary 50% boost to Claude Code weekly limits ends 13 September 2026. The permanent replacement is 25% above the original baseline: not today's.
Google Assistant is gone from Android, Wear OS, and Android Auto from 4 September 2026, replaced by Gemini with no option to revert.
Google deprecates gemini-omni-flash-preview on 30 September 2026. Teams must migrate to the GA gemini-omni-1.1-flash endpoint before that date.
Google begins removing Assistant from Android phones, tablets, Wear OS, headphones, and Android Auto on 4 September 2026, with no way to switch back.
Google retires gemini-robotics-er-1.6-preview on 31 August 2026. The replacement, gemini-robotics-er-2-preview, adds multi-robot coordination and agentic code execution.
From 31 August 2026, GPT-5.4 and GPT-5.4 mini no longer work in Codex under ChatGPT sign-in. Here is what to do.
Anthropic's Claude 3 Haiku on Vertex AI reached end-of-life on 23 August 2026. Any app still calling it will now receive errors.
On 26 August 2026, OpenAI removes o3 from ChatGPT's model picker and permanently shuts down the Assistants API. Here's what breaks and what to do.
The Files API beta header is no longer required on /v1/files endpoints, simplifying file-grounded Claude API integrations from 20 August 2026.
The xai/grok-4.1-fast-reasoning and xai/grok-4.1-fast-non-reasoning model IDs stop working on 20 August 2026. Here's how to migrate.
Three Imagen 4 API endpoints shut down permanently on 17 August 2026. Here's what broke, why, and how to migrate to gemini-3.1-flash-image.
The legacy Claude Workbench and three /v1/experimental/ prompt API endpoints reach end of life on 17 August 2026. Here's what to do.
OpenAI has disabled individual-user sync connections in ChatGPT Enterprise and Edu. Admins must migrate to admin-managed sync or plugins now.
Google has reversed its 4 August 2026 deadline to remove Gemini 3.5 Flash from the global-region endpoint. No new date has been set.
Anthropic's AI classifier replaces per-action approval prompts in Claude Code, catching 89% of dangerous commands vs 13.6% for human reviewers.
From 24 July 2026, speed: 'fast' on Opus 4.7 returns a hard 400 error. Here's what to fix and what the new fallbacks default mode gives you.
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.
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.
OpenAI is retiring GPT-5.4 and GPT-5.4 mini from Codex for ChatGPT-authenticated users on 31 August 2026. Here's what to do before the deadline.
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.
OpenAI's Assistants API is gone on 26 August 2026. This is a full architectural migration to the Responses API, not a quick endpoint swap.
The legacy Workbench and three /v1/experimental/ prompt endpoints shut down 17 August 2026. Here's what to export and what replaces them.
Imagen 4 model endpoints hard-shut-down 17 August 2026. Migration means switching method, model name, and response parsing.
Gemini's preview image generation models are deprecated with a hard shutdown on June 25, 2026. Here's what to change and when.
The fifth MCP spec drops stateful sessions for a request/response core, hardens OAuth/OIDC auth, and graduates MCP Apps and Tasks as versioned extensions.
The legacy Gemini Interactions API outputs schema was permanently removed on June 8, 2026. Here's what changed, what's broken, and how to migrate.