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The release of ChatGPT 5.5 on April 23, 2026, has shifted the AI landscape yet again. Unlike previous incremental updates, this model (internally codenamed "Spud") represents the first full retraining of OpenAI’s base architecture since GPT-4.5. It arrives just days after major releases from Anthropic (Claude Opus 4.7) and Moonshot AI (Kimi K2.6), setting up a high-stakes battle for agentic supremacy. The Benchmarks: A New Leader in Agentic Work ChatGPT 5.5 has reclaimed the top spot on several key benchmarks, particularly those measuring a model’s ability to use a computer like a human. | Benchmark | ChatGPT 5.5 | Claude...