`session.thread_*` webhook events now include `session_thread_id` identifying the multi-agent thread that triggered the event.

The important part is explicit multi-agent thread identity inside the event payload.

This sits inside `session.thread_*` webhook handling, giving builders the triggering multi-agent thread ID in each event.

• Jun 11, 2026OpenAI modelcard diff shows the API docs navigation content removed.
• Jun 11, 2026OpenAI pricing page removed visible API pricing content for GPT-5.5, GPT-5.4, and realtime.
• Jun 11, 2026Anthropic launched Claude Fable 5 and Claude Mythos 5 with 1M context and 128k max output.

This is the world we build in. It moves this fast. We move with it.