GPT-5.5 Launches: 82.7% on Terminal-Bench 2.0, Doubles API Pricing

OpenAI·high signal

OpenAI released GPT-5.5 on April 23 in standard and Pro tiers. The standard model scores 82.7% on Terminal-Bench 2.0 (vs Claude Opus 4.7's 69.4%), while GPT-5.5 Pro nearly doubles Opus 4.7 on FrontierMath Tier 4 (39.6% vs 22.9%). API pricing doubles to $5/$30 per million input/output tokens for standard, and $30/$180 for Pro — a significant cost increase that signals OpenAI believes the capability gap justifies premium pricing.