looks like new Pareto frontiers across everything: - Context: 400K context in Codex and a 1M in API - API Pricing: 5/m input and 30/m outp…

looks like new Pareto frontiers across everything: - Context: 400K context in Codex and a 1M in API - API Pricing: 5/m input and 30/m output tokens. - Codex improved its own inference speed 20% lol - First generation co-designed with GB200 and GB300 NVL72 - 82.7% on Terminal-Bench 2.0 - 73.1% on Expert-SWE (new internal eval). - 58.6% on SWE-Bench Pro - 84.9% on GDPval (knowledge work ~solved?). - 98.0% on Tau2-bench Telecom (support). - 80.5% on BixBench (bioinformatics and data analysis) Introducing GPT-5.5 A new class of intelligence for real work and powering agents, built to understand complex goals, use tools, check its work, and carry more tasks through to completion. It marks a new way of getting computer work done. Now available in ChatGPT and Codex.

Source: Swyx (X) | 2026-04-23