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Moonshot has open-sourced the Kimi K2.6 model, supporting 4,000 tool calls in a single session and 300 parallel sub-agents, achieving SOTA on benchmarks like SWE-Bench Pro and claiming performance on par with Claude Opus 4.6 and GPT-5.4.
Kimi K2.6 is released as an open-source model that achieves state-of-the-art performance on long-horizon coding and agent swarm benchmarks.
LongCoT introduces two new agent leaderboards (Restricted & Open Harness), with GPT 5.2 RLM topping the Open Harness at 25.12%.