The Agentic Foundation Model Reset: How April 2026's Thirty-Day Release Cascade Doubled Token Pricing and Quietly Closed the Chat Era
In thirty days every major frontier lab shipped an agentic-first foundation model. GPT-5.5 'Spud', Claude Mythos 5, Gemini 3.1, and DeepSeek V4 each arrived with two-to-three times the token economics of their chat-era predecessors and a benchmark portfolio that prizes operating-system control over multiple-choice trivia. The chat era did not end with an announcement; it ended with four near-simultaneous price hikes and a quietly retired benchmark suite.