Anthropic removed fast mode for Claude Opus 4.6; fast requests now run and bill at standard speed.

Speed flags on Claude Opus 4.6 no longer buy fast mode, so billing and latency assumptions need checking.

Fast mode remains tied to supported models; migrate to Claude Opus 4.8 if that path is required.

• 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.