GPT-5.5, Opus 4.7, DeepSeek V4: Frontier AI

Between April 16 and April 24, three of the biggest AI labs in the world shipped frontier models. Opus 4.7. GPT-5.5. DeepSeek V4. Anthropic's Mythos Preview landed a week before that, gated behind an invite list. Google's Gemini 3.1 Pro set the pace back in February with a 77.1% on ARC-AGI-2. 1 2 3 4 5 TL;DR. Four frontier AI models, eight days, one feature set. Agentic, 1M context, better coding, priced within a few multiples of each other. This is what Matt Ridley calls simultaneous invention