Claude Fable 5 and Claude Mythos 5 now omit thinking display by default.

Readable thinking summaries require an explicit display setting, and raw chain of thought is never returned.

This matches Opus and Mythos Preview defaults, so multi-turn builds must pass thinking blocks back unchanged.

• 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.