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Moonshot AI Releases Kimi K3.1 Pro, Open-Source Model Rivals Top Closed SystemsYuchen Jin (@Yuchenj_UW)T1Models
Yuchen Jin (@Yuchenj_UW) · 10/24/2026, 01:27:58
Kimi K3.1 Pro Released: Open-Source Model Outperforms Claude Opus 5.5
By Yuchen Jin (@Yuchenj_UW)
68AI Score
Executive Summary
Moonshot AI released Kimi K3.1 Pro, claiming it is the strongest open-source model currently available. It outperforms Claude Opus 5.5 on the Terminal-Bench 4.0 benchmark at approximately one-third of the cost.
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Yuchen Jin (@Yuchenj_UW) · 2026-10-23 17
Kimi K3.1 Pro is out!
should be the strongest OSS model now.
It beats Claude Opus 5.5 on Terminal-Bench 4.0 at ~1/3 the cost!
