Moonshot unveiled Kimi K3, a 2.8-trillion-parameter model that the Alibaba-backed company says will be the largest open-weight model available once released by July 27. Artificial Analysis ranks it just behind leading proprietary systems, while Arena.ai's leaderboard places it above Claude Fable 5 and GPT-5.6 Sol in front-end development. Moonshot acknowledges K3 still trails those models overall. Arena.ai CEO Anastasios Angelopoulos called it the moment OSS Chinese models surpassed US models.
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