#GPT-5.6

On the morning of July 12, 2026, Anthropic and OpenAI both announced usage-limit relief within less than an hour: Claude extended Fable 5 availability across paid plans and kept Claude Code weekly limits 50% higher until July 19; OpenAI temporarily removed the 5-hour usage window for Plus, Business, and Pro, optimized GPT-5.6 Sol efficiency, and reset usage. This post explains what happened and why it matters for developers.

OpenAI previewed the GPT-5.6 family: Sol is the frontier tier, Terra is the balanced everyday tier, and Luna is the fast low-cost tier. The real shift is that model selection moves from 'which model is strongest' to 'which tier should this task be routed to'.