Key Takeaways xAI shipped Grok 4.5 on July 8 at $2/$6 per million tokens, undercutting Opus 4.8 pricing by over 60%. Anthropic released Claude Opus 5 on July 24 as the new default model on Claude Max subscriptions. Moonshot AI published Kimi K3, its largest model at 2.8 trillion parameters. Grok 4.5 from xAI, Claude Opus 5 from Anthropic, the GPT-5.6 family from OpenAI, and Kimi K3 from Moonshot AI each target the same problem: getting an AI system to carry a multi-hour task, from research to coding to structured reporting, without losing track of the plan. Grok 4.5 Trains …


