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Moonshot AI releases Kimi K3.1 Pro with 1-million-token context window, promises open weights

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Moonshot AI announced Kimi K3.1 Pro (and a Highspeed variant) as the first model in its K3.1 series on October 24, 2026, describing the flagship as a 3T-class open-weight model with a 1,048,576-token context window, availability across Kimi apps and APIs, benchmark results the company says top some competitors on select tasks, and a full-weight release scheduled for November 4, 2026.

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Moonshot AI positioned K3.1 Pro as its most capable 3T-class open-weight model, pairing it with a Highspeed variant claimed to run two to three times faster; the company published internal benchmark scores (Terminal‑Bench 4.0, BenchCAD, OfficeQA Pro v2 and others) and said it removed cyber-related data from training to lower vulnerability capabilities, while scheduling full weight publication by November 4, 2026.

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