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Moonshot AI retires Kimi K2 models, pushing users to K3.1 Pro with new cost structures

By PulseAugur Editorial · [1 sources] ·

Moonshot AI is phasing out its Kimi K2 series models, with new accounts no longer able to access them after October 31, 2026, and all K2 models scheduled for retirement by the end of December 2026. The successor model is Kimi K3.1 Pro. Migrating to K3.1 Pro requires more than just changing the model name, as certain sampling parameters are now fixed, and a new 'reasoning_effort' field defaults to 'max,' significantly impacting costs by increasing the proportion of thinking tokens. Moonshot AI has also promised open weights for K3.1 Pro, but they have not yet been released. AI

IMPACT Users of Moonshot AI's Kimi models must migrate to K3.1 Pro, adapting their code for new parameter constraints and potentially higher costs due to default reasoning effort settings.

RANK_REASON This is a product update and deprecation notice for an existing AI model series, not a frontier release.

Read on dev.to — LLM tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Moonshot AI retires Kimi K2 models, pushing users to K3.1 Pro with new cost structures

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COVERAGE [1]

  1. dev.to — LLM tag TIER_1 English(EN) · ai maya ·

    Kimi K2 closes in December: what moving to K3.1 Pro changes, and what the default reasoning effort costs

    <h2> TL;DR </h2> <p>Moonshot AI's documentation says that since 2026-10-31 the Kimi K2 series (<code>kimi-k2.6</code>, <code>kimi-k2.7-code</code> and its highspeed variant) is closed to newly registered accounts. Existing accounts keep working, and Moonshot plans to retire every…

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