How often the four largest AI labs ship major models — the observable pulse of the AI buildout, compiled from public announcements.
A vendor-neutral timeline of major AI model releases from Anthropic, Google, OpenAI, and xAI, with each lab's recent cadence: median time between releases, days since the last one, and a projected next-release window. A projection is a description of recent rhythm, not a forecast.
Flagship and numbered point releases only — mini, lite, and voice variants are excluded. Every figure is computed from the release dates; nothing is hand-entered.
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