Kimi K3

• 🧠 Ultra-large-scale open-weight reasoning model from Moonshot AI
• 📏 Massive 1M-token context window
• 👁️ Multimodal — reasons over images, logs, and tests
• 🔧 Strong tool use, function calling, and web search
• 🎯 Built for complex coding and long-horizon agentic work
• 🌍 Open weights for self-hosting and inspection

Moonshot

Moonshot is an AI research lab known for developing the Kimi family of large language models. The organization has gained recognition for building capable reasoning-oriented models, with the Kimi line representing its flagship series of text generation…

Kimi K3 is Moonshot AI's ultra-large-scale, open-weight multimodal reasoning model, built for complex coding, knowledge work, and long-horizon agentic workflows. Released in July 2026, it pairs a one-million-token context window with vision, tool use, function calling, and web search, letting it iterate against images, logs, tests, and runtime feedback rather than reasoning in isolation. Its design leans heavily toward navigating large repositories, debugging, and multi-step problem solving where a model must plan, act, and revise over extended sessions.

Within Moonshot's Kimi K lineup, K3 sits at the top of the general-purpose reasoning tier, alongside Kimi K2.6 and Kimi K2.5, while Kimi K2.7 Code serves as the dedicated coding-specialized branch. As an open-weight release, it can be inspected and self-hosted, an appealing trait for teams wanting transparency alongside frontier-scale capability.

K3 is best suited to demanding agentic and engineering tasks — large-codebase reasoning, automated debugging, tool-driven research, and workflows that combine text and visual inputs across very long contexts.