AIWire: AI model shutdowns, prices and API changes
The wire
Every change we detect, newest first. Times are Eastern (ET). Archive
TuesdaySeptember 29, 2026
Introducing GPT-6.1 Sol
What to do: Check whether this affects your integration and plan for it.
Added Ultrafast mode for GPT-6 Astra in the Responses API.
What to do: Use service_tier: "ultrafast" with gpt-6-astra in the Responses API to reduce inter-token latency, keeping in mind EU and other regional inference residency are not supported.
Released GPT-6.1 Sol (gpt-6.1-sol) for complex coding and professional work at a lower cost than GPT-6 Astra.
What to do: Use the Responses API for tool calling and see GPT-6 model guidance for reasoning settings and pricing for available processing tiers.
Added computer use to the Agents API.
What to do: No action needed; background reading.
MondaySeptember 28, 2026
Anthropic Python SDK 1.9.0
What to do: Update the Anthropic Python SDK to v1.9.0 to use new features including between_tools thinking, streaming tool calls, and cache diagnostics on Message/MessageCreateParams.
OpenAI Python SDK 3.20.0
What to do: Update to v3.20.0 to access new Agents credential and session options, Cyber access programs in Responses, and improved WebSocket handling for live and realtime features.
We've launched Claude Sonnet 5.5 (claude-sonnet-5-5).
What to do: Review the migration guide and update code that targets Claude Sonnet 5 before using Claude Sonnet 5.5, especially for tool_choice, thinking configuration, computer use tool names, and advisor model…
FridaySeptember 25, 2026
Fixed a bug in image encoding that degraded image understanding in GPT-6 Sol and GPT-6 Luna.
What to do: Rerun evaluations and retry affected workflows if your use cases involve image inputs.