Kimi K3 — Launch and Evaluation Disclosures
launch coverage · source date 2026-07-16 · added 2026-08-07 15:52:43 · updated 2026-08-07 15:52:43 · Open original blog
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Problems / challenges / motivations
- The largest open-weight releases now ship with vendor eval tables well before any technical report or independent check exists.
- Practitioners have to decide whether to trust those tables in the gap between launch and verification.
- Open-weight releases are irreversible, which raises the stakes on that gap.
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Key ideas
- Kimi K3 is a 2.8T-parameter model (16 of 896 experts active) with a 1M-token context, released as open weights.
- Vendor eval tables report GPQA-Diamond 93.5, Terminal-Bench 2.1 88.3, BrowseComp 91.2, MCP-Atlas 84.2, and SWE-Marathon 42.0.
- Moonshot claims top open-weight standing, behind only GPT-5.6 Sol and Claude Fable 5.
- Full weights and the technical report were promised for 2026-07-27, after the launch numbers circulated.
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Why it matters for evals
- It is a live case study in eval-disclosure practice: the numbers arrived first, the report second, and independent verification third.
- Read it against the UK AISI + CAISI cyber assessment of the same model, which is the credible independent signal and lands more conservatively.
- Caveat: numbers are vendor-reported and pre-technical-report. This link is credible practitioner coverage (The Batch), not the primary Moonshot report.
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