OpenAI modelcard diff removes the prior API docs navigation.

Treat the page as unstable before relying on scraped model-card metadata.

The removed snapshot included primary docs navigation, Agents SDK, Tools, run and scale, and reasoning sections.

• Jun 27, 2026OpenAI retired GPT-4.5 in ChatGPT, including custom GPTs, with existing conversations continuing on GPT-5.5.
• Jun 27, 2026OpenAI modelcard diff removed API docs navigation content.
• Jun 27, 2026Anthropic removed model-card text covering Claude Fable 5 and Claude Mythos 5.

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