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TRUE, BUTAnnounced Not Shipped

Its weights aren't downloadable

The model that closes the gap has no downloadable weights yet, and Artificial Analysis lists it as proprietary.

“Kimi K3.1 Pro puts open-source AI a month behind the best, reaching fourth on the Artificial Analysis index, about 3 points behind Claude Opus 5.5.”

ModelCompare blog post (23 October 2026); trending on Hacker News and r/artificial 24 to 25 October 2026

Recorded 25 October 2026. Our ruling means: literally true, materially misleading.

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Receipts pack

The evidence file for this verdict

17 receipts: 7 support the claim, 4 contradict it, 6 add context. 5 figures on the record, 4 traced to a quoted receipt.

The receipts

Each source, the line we quote from it, its date and which way it cuts. Free to read and to cite.

  1. 1Supports the claimmodelcompare.ai ↗

    In time, that puts open-source AI about a month behind: Claude Opus 5.5 first scored that high 31 days earlier.

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  2. 2Supports the claimmodelcompare.ai ↗

    In time, that puts open-source AI about a month behind:

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  3. 3Contextmodelcompare.ai ↗

    Only models Artificial Analysis marks as open weights count.

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  4. 4Contradicts the claimmodelcompare.ai ↗

    count it as open because Kimi says it will publish the weights by

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  5. 5Contradicts the claimmodelcompare.ai ↗

    until then it runs on Kimi’s own API.

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  6. 6Contextmodelcompare.ai ↗

    Our snapshot is from 18 October

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  7. 7Contradicts the claimartificialanalysis.ai ↗

    Kimi • Proprietary model • Released October 2026

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  8. 8Supports the claimartificialanalysis.ai ↗

    Kimi K3.1 Pro scores 55 on the Artificial Analysis Intelligence Index

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  9. 9Contextartificialanalysis.ai ↗

    it generated 150M tokens, which is very verbose in comparison to the median of 87M

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  10. 10Contextartificialanalysis.ai ↗

    it costs $2.11 per task to evaluate Kimi K3.1 Pro on the Intelligence Index

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  11. 11Contextartificialanalysis.ai ↗

    Intelligence Index is a primarily text-based, English-language evaluation suite

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  12. 12Contextartificialanalysis.ai ↗

    Artificial Analysis Intelligence Index v4.3.2 incorporates 10 evaluations

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  13. 13Supports the claimkimi.com ↗

    our most capable 3T-class open-weight model to date

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  14. 14Contradicts the claimkimi.com ↗

    The full model weights will be released by Nov 4.

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  15. 15Supports the claimmodelcompare.ai ↗

    scores 55.1 on the Artificial Analysis Intelligence Index, a blend of hard tests in reasoning, knowledge, coding and agent work.

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  16. 16Supports the claimmodelcompare.ai ↗

    That is 2.5 points short of Claude Opus 5.5

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  17. 17Supports the claimmodelcompare.ai ↗

    When Xiaomi released MiMo-V2.6-Pro in September , the gap was 104 days

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Members' extras

What each receipt proves, and what would change our mind.

  • What each receipt above proves, in our words
  • The figures table, each number traced to the receipt that states it
  • The trick behind the claim, explained, with the guide to spotting it
  • What would change our verdict
  • Our call on the record, with its due date

The verdict, the opening and every receipt above stay free. Membership adds our analysis to the evidence file for every checked story.

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