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China's Kimi K3.1 Pro nears Claude Opus 5.5 in coding benchmark, weights to be free

By PulseAugur Editorial · [1 sources] ·

Moonshot AI's Kimi K3.1 Pro has achieved a score of 65.7% on the Terminal-Bench coding benchmark, narrowly trailing Anthropic's Claude Opus 5.5 by 0.7%. The Chinese AI company plans to release the weights for Kimi K3.1 Pro by November 4th, making them freely available. This development positions Kimi K3.1 Pro as a strong competitor in the coding assistance domain. AI

IMPACT Positions Kimi K3.1 Pro as a strong competitor in coding assistance and signals a trend towards open-weight frontier models.

RANK_REASON Frontier-lab model release with benchmark performance and open weights announcement. [lever_c_demoted from frontier_release: ic=1 ai=1.0]

Read on Mastodon — mastodon.social →

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

China's Kimi K3.1 Pro nears Claude Opus 5.5 in coding benchmark, weights to be free

How we ranked this

Signal score
12 / 100
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Significant
Frontier-lab model release with benchmark performance and open weights announcement. [lever_c_demoted from frontier_release: ic=1 ai=1.0]
Source corroboration
Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
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model release, product
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High
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Breaking (< 6h)
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COVERAGE [1]

  1. Mastodon — mastodon.social TIER_1 English(EN) · madrobotblog ·

    China’s Kimi K3.1 Pro comes within a point of Claude Opus 5.5 at coding, and its weights will be free Moonshot AI’s Kimi K3.1 Pro scores 65.7% on Terminal-Bench

    China’s Kimi K3.1 Pro comes within a point of Claude Opus 5.5 at coding, and its weights will be free Moonshot AI’s Kimi K3.1 Pro scores 65.7% on Terminal-Bench 4.0 vs Claude Opus 5.5’s 66.4%, costs $2/$10 on the API and gets open weights by Nov 4. # Kimi # OpenSource # AI https:…

    LINKS madrobot.blog/…/kimi-k3-1-pro-moonshot-op…

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