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Moonshot AI releases Kimi K3.1 Pro on its Kimi API, offering a Highspeed variant and pricing per input and output token while planning full open-weight availability later

Model release Provisional 88% confidence first seen

Moonshot AI introduced Kimi K3.1 Pro via the Kimi API, positioning it as a coding- and agent-focused model with a 1-million-token context window and a Highspeed variant. The company set token-based pricing for input and output usage and stated that full model weights are expected by Nov 4, 2026, with open-weight availability coming later.

Kimi K3.1 Pro Moonshot Moonshot AI Artificial Analysis Claude Fable 5.1 Claude Opus 5.5 GPT-6.1 Sol Kimi Kimi API Kimi K3.1 MarkTechPost OpenAI Terminal-Bench 4.0

Source coverage

Introducing Kimi K3.1 Pro Simon Willison’s Weblog industry analysis Moonshot AI Releases Kimi K3.1 Pro: A 2.8T Total/104B Active Params (MoE) Model with 1M Context MarkTechPost

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