Three Frontier Models in Ten Days: Architect for the Swap
Three frontier model releases landed inside ten days in early July 2026: Anthropic's Claude Sonnet 5, xAI's Grok 4.5, and OpenAI's GPT-5.6 family. The pace, not any single model, is the real event. It signals that 'best available' now resets on a roughly monthly clock while prices converge inside a few dollars per million tokens. For PMs, that turns model choice from a quarterly bet into a portability problem your architecture has to solve now.
