AI news for : 4 updates. Every card links to the maker's own page.
On Claude Opus 5.5, requests that set thinking to disabled or enabled return a 400 error. Thinking depth is set with the effort parameter instead.
Why it matters
Integrations moving to Claude Opus 5.5 need to drop the thinking field before they switch.
Tools can now be defined inside a mid-conversation system message, in beta on the Claude API. A tool can be added or changed partway through a conversation.
Why it matters
Agents on the Claude API whose tools change as a task moves along can update them without starting over.
Version 3.18.0 of the official OpenAI Python SDK adds GPT-6 Sol and Luna model identifiers.
Why it matters
Apps built on OpenAI's API can test the GPT-6 models through the official SDK.
Claude Opus 5.5 is the first model in Anthropic's new Claude 5.5 family.
Why it matters
Vetted organizations can apply to use Opus 5.5 for biology research.
Find dated assistant changes, one table per assistant, in the tracker.