GPT-5.4, AI Modes, and Help Center Rewrite

New

• GPT-5.4 - OpenAI's latest model is now available as a quality model option.
• 3 AI Modes - Economy (Gemini only, lowest cost), Smart (Gemini for reading + Claude for building), and Pro (Claude for everything).

Improved

• Help Center rewritten - All help articles updated to reflect current AI features, modes, and model names.