Anthropic removed model-card guidance naming Claude Fable 5 and Claude Mythos 5.

Treat affected model routing references as stale until checked against the current Anthropic model card.

• Aug 23, 2026OpenAI pricing page removed business pricing copy and GPT-5.6 model rate listings.
• Aug 22, 2026OpenAI model docs removed GPT-5.6 Sol, Terra, and Luna model guidance.
• Aug 22, 2026Anthropic released v1.0 of the Python SDK, moving its HTTP layer from httpx to httpx2.

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