Claude Fable 5 requires 30-day data retention on the Claude API, with no zero data retention availability.

If zero data retention is mandatory, this model is out of scope for API use.

Data retention is model-specific here, so builders need retention checks before selecting Claude Fable 5 on the API.

• 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.