xAI added per-request priority scheduling for text inference via `service_tier: "priority"`.

Priority is now explicit at request time, with billing tied to actual priority use.

It sits on Chat Completions and Responses, giving builders a response field to verify the applied service tier.

• Aug 05, 2026OpenAI removed model selection copy naming GPT-5.6 Sol, Terra, and Luna.
• Aug 05, 2026Anthropic removed model card copy for Claude Fable 5 and Claude Mythos 5.
• Aug 05, 2026Google pricing page removed Gemini model navigation and Interactions API availability note

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