OpenAI's GPT-5.5 Instant claims 52.5% fewer hallucinations on medical, legal, and financial prompts and is rolling out to all ChatGPT users.
GPT-5.5 Instant replaces prior ChatGPT default: 86% GPQA score (free tier), stronger factuality, memory personalization, API alias gpt-5.5-chat-latest.
GPT-5.5 chose its own party date — May 5 at 5:55 PM, OpenAI SF HQ. RSVP open; Codex will select attendees. Travel and hotel covered for non-locals.
OpenAI launches GPT-5.5 in ChatGPT and Codex with $5/$30 per-million token pricing, 1M context, and major token efficiency gains.
GPT-5.5 scores 2.5× better intelligence-per-token than 5.4, surpasses the human baseline on OS World, and expands Codex into a full desktop agent.
Sam Altman signaled via emoji reply that GPT-5.5 or GPT-6 may launch April 23 — confirmed independently by @swyx. No official announcement published yet.
Curated AI insights — sent when there's something worth your inbox.