Kimi K3
Run frontier-level coding and reasoning tasks on a 2.8-trillion-parameter open-weight model, with the option to self-host once the full weights ship.
Alternatives
Overview
Kimi K3 is Moonshot AI's 2.8-trillion-parameter open-weight model, built for long-horizon reasoning and coding work that runs across many steps instead of a single response. It handles multi-file codebases, agentic tool-calling loops, and extended chains of reasoning at a scale that puts it in range of the top closed frontier models on independent coding and math benchmarks. Access is available now through the API at usage-based rates, with the full model weights scheduled for a free release so teams can self-host rather than depend on a single vendor's uptime and pricing.
The scale that makes K3 competitive also means it needs serious infrastructure to self-host once the weights are public, so most users will start on the hosted API and only move to self-hosting once they have the hardware to justify it. Kimi K3 fits engineering teams and researchers who want frontier-level reasoning and coding performance with the option to eventually run the model on their own infrastructure instead of staying locked into a single API.
Key Features
- 2.8-trillion-parameter open-weight architecture
- Long-horizon multi-step reasoning and agentic tool-calling
- Multi-file codebase support for real-world coding tasks
- Free self-hostable weights on public release
- • Competitive with closed frontier models on coding and math benchmarks
- • Open weights mean no long-term vendor lock-in
- • Pay-per-token API access available immediately, no waitlist
- • Self-hosting the full model requires substantial GPU infrastructure
- • Very new release with limited independent long-term reliability data
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