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xAI's Timeline Dates Grok to November 3, 2023. The Open Weights Are a 314 Billion Parameter Model.
The announcing post describes Grok-1 and a 33 billion parameter Grok-0. The open-release post says Apache 2.0, 314 billion parameters, and a pretraining run that concluded in October 2023. The company timeline dates that release to March 17, 2024. Later model posts carry their own dates where the article prints one.