Kimi K3: The Complete Developer Guide

Kimi K3, developed by Moonshot AI, is a groundbreaking open-source model with 2.8 trillion parameters, setting a new standard in open-weight models by being the first in the 3-trillion-parameter class. It is designed for advanced tasks such as long-horizon coding, deep reasoning, and end-to-end knowledge work, making it competitive with proprietary models like Claude Fable 5 and GPT 5.6 Sol. The model features innovations such as Kimi Delta Attention and Attention Residuals, enhancing its ability to process long sequences efficiently. Kimi K3 supports a 1M token context window and is available through Together AI, where it offers flexible reasoning capabilities and competitive pricing. The model excels in several coding and agentic benchmarks, demonstrating its frontier-level performance while also supporting vision tasks with multiple image inputs. By utilizing tools like automatic caching and dynamic tool loading, Kimi K3 provides a scalable and efficient solution for complex computational tasks, making it accessible for production use with a single API call on Together AI.

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