Frontier AI labs have settled into a near-monthly release cadence, with this week's GPT-5.6, GPT-Live, ChatGPT Work, Grok 4.5, and Muse Spark 1.1 revealing a shift where the model is becoming a runtime and "answering" is giving way to execution. OpenAI split GPT-5.6 into Sol, Terra, and Luna, optimizing for intelligence and performance per dollar, with a geekiest feature of programmatic tool calling that lets the model write programs to coordinate tools. GPT-Live's full-duplex architecture can listen and speak simultaneously, replacing turn-based interaction with an event loop for human-machine collaboration. ChatGPT Work can operate across connected apps, websites, and files, producing editable documents, spreadsheets, presentations, and sites, making the unit of value a finished artifact. Meta’s Muse Spark 1.1 combines a million-token context window with multimodal perception, coding, computer use, and multi-agent orchestration, while the paid Meta Model API marks a strategic turn to sell metered intelligence. Grok 4.5, built for coding, agentic tasks, and knowledge work, pushes into application generation with aggressive pricing. Frontier labs are vertically integrating models, voice interfaces, agents, browsers, desktop environments, and artifact layers, fighting for ownership of the loop between intent and outcome.