moonshotai/Kimi-K3

moonshotai/Kimi-K3 is a frontier-tier language model from Together AI. moonshotai/Kimi-K3 is a proprietary model available exclusively through Together AI's API. The Kimi family is Together AI's model series for this capability tier.

moonshotai/Kimi-K3 is priced at $3/1M input tokens and $15/1M output tokens. Output tokens are 5× more expensive than input tokens — this ratio reflects the sequential nature of autoregressive generation, which requires a separate forward pass per output token versus parallel processing of all input tokens simultaneously. At a typical usage pattern of 1,000 input tokens and 500 output tokens per call, moonshotai/Kimi-K3 costs approximately $10.50 per 1,000 API calls. Together AI does not publish a prompt caching rate for this model, so repeated long contexts are billed at the standard $3/1M input rate.

Its 131K-token context window handles most long-document tasks — roughly 75,000 words or a full novel — without requiring chunking or retrieval augmentation. Median latency (P50 time-to-first-token) is approximately 600ms — suitable for interactive applications where sub-second response is acceptable. Throughput is approximately 90 tokens/second — adequate for streaming at comfortable reading speed. Maximum output length is 16K tokens — sufficient for long-form content generation, detailed code files, and extended reports.

moonshotai/Kimi-K3 is best suited to reasoning, coding, chat. Supported capabilities include function calling / tool use for agentic workflows, streaming token output for real-time UIs. Function calling support makes it suitable for building AI agents, structured data extraction pipelines, and any workflow requiring the model to invoke external APIs or return typed JSON. When evaluating this model for a specific workload, the most important factors are: context window (does your input fit?), output price (how long are your generations?), and latency (is this interactive or batch?). The pricing table above shows how moonshotai/Kimi-K3 compares to similar models across these dimensions.

moonshotai/Kimi-K3 sits in the frontier tier — the highest-capability models available, used when quality is the primary constraint and cost is secondary. Unlike open-weights alternatives, moonshotai/Kimi-K3 is only available via Together AI's API — there is no self-hosted option, which simplifies deployment but creates vendor dependency. When comparing moonshotai/Kimi-K3 to alternatives, use the similar models section on this page to find models at comparable price points with different capability tradeoffs. The intelligence score (88/100) reflects aggregate benchmark performance — a useful proxy for general capability, though real-world performance varies significantly by task type. Always test with your specific prompts and use case before committing to a model for production.