Kimi K2 0905

Kimi K2 0905 is a Mixture-of-Experts language model from Moonshot AI with a 262K token context window, released in September 2025.

Strengths

The model handles long-context tasks efficiently through its MoE architecture, which activates a subset of parameters per forward pass to balance capability with inference speed.

Best for

Applications requiring extended context windows where token efficiency matters, such as document analysis, long conversation history, or working with multiple file inputs simultaneously.

Limitations

As a predecessor to K2.6 and K2.5, it lacks the Agent Swarm coordination capabilities and multimodal features available in later Moonshot releases, making it less suitable for agentic or vision-dependent workflows.