Four models dropped this week: GPT Live, Grok 4.5, Cognition SWE 1.7, and GPT-5.6 Sol. The pace is accelerating and the specialization is sharpening. This is not a story about one breakthrough. It is a story about the AI stack fragmenting into purpose-built layers.
GPT Live brings full-duplex voice with background model orchestration, targeting translation, tutoring, and live conversation. Grok 4.5 and Cognition SWE 1.7 are built for agentic coding and workflow automation at low cost and high speed. GPT-5.6 Sol is positioned as a fast practical workhorse, explicitly contrasted against Fable's deeper reasoning tier. Each model has a job. None of them are trying to do everything.
The original breakdown is worth reading for how these models map to actual work tasks, not just benchmarks. The more important question buried in this release week: if model cadence keeps compressing and specialization keeps increasing, how do teams decide which model runs which part of their stack? That answer is still being written.
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