
GPT-5.5 Review Inside OpenAIs Smartest and Most Intuitive AI Model
Key Takeaways GPT-5.5 was released by OpenAI on April 23, 2026, with GPT-5.5 Instant becoming ChatGPT’s default model for free users on May 5, 2026. The model scores 93.6% on GPQA Diamond (PhD-level science questions) and 82.7% on Terminal-Bench 2.0, outperforming Claude Opus 4.7 by…









