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28 posts about API Developers from Simon Carter.
Google's antigravity-preview-05-2026 agent harness reached its hard shutdown on 5 October 2026. All API calls must now target antigravity-preview-09-2026.
OpenAI's Ultrafast service tier for GPT-6 Astra exits its grace period on 5 October 2026. Here's what you'll pay and what to expect.
The gpt-5.4-cyber model ID was removed from the OpenAI API on 1 October 2026. Calls to it now return errors. Migrate to gpt-5.6-cyber.
OpenAI's Ultrafast tier delivers up to 8× faster token generation for GPT-6 Astra. Available now via service_tier: 'ultrafast'. Billing starts 5 October 2026.
Google's new Antigravity harness brings PascalCase tool parameters and line-range file edits. Here's who needs to act before 5 October 2026.
The Sora 2 Videos API closed permanently on 24 September 2026. No successor model exists. Developers must migrate and export data now.
Anthropic's Claude Opus 5.5 matches Fable 5.1 on key benchmarks, cuts API costs 20: 60%, and raises usage limits for Pro and Team subscribers.
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.
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.
Anthropic launches Claude Fable 5.1 with cache reads cut 75% to $0.25/MTok, saving up to 45% on agentic workloads. Mythos 5.1 stays restricted.
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 has confirmed the $2/$10 per million token rate for Claude Sonnet 5 is now permanent. The planned 50% increase from 1 September 2026 will not happen.
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.
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.
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.
Anthropic has deprecated claude-opus-4-1-20250805 with a retirement date of August 5, 2026. Opus 4.8 is the recommended replacement.
OpenAI drops Luna API prices to $0.20/$1.20 per million tokens and trims Terra by 20%, calling it the beginning of an 'abundance flywheel' strategy.
Claude Code Pro/Max limits stay 50% higher through August 19, 2026. Sonnet 5 API intro pricing ends August 31 — and a tokenizer change makes the real cost rise bigger than it looks.