GPT-5.6 SOL USES TWICE THE TOKENS OF GPT-5.5

Summary from the TLDR AI newsletter

GPT-5.6 Sol xhigh now uses more than twice as many tokens per session as GPT-5.5 xhigh in Codex workflows. This cuts the effective value of a token-based quota by more than half. At the same token price, 2.25x the tokens means roughly 2.25x the cost for a similar token mix. GPT-5.6 Sol also adds a cache-write charge that GPT-5.5 didn't have.