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Model Pricing

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K3 Series Models

All K3 series models support a 1,048,576-token context window. Note: The Kimi API automatically enables context caching billing for repeated request prefixes, with a default TTL (time-to-live) of 5m. For TTL settings and cost optimization tips, see Best Practices for Context Caching.

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K2 Series Models

All K2 series models support a 262,144-token context window.
Dear Kimi Users, starting October 31, 2026, K2 series models will no longer be available to newly registered users; existing users are not affected. We plan to retire all K2 series models by the end of December 2026, please prepare your migration in advance.
Here, 1 MTok = 1,000,000 tokens. The prices in the table represent the cost per MTok consumed. Explanation: Prices exclude applicable taxes. Specific tax obligations are subject to local tax regulations and will be calculated at checkout based on your jurisdiction.

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Concepts

Model inference on the Kimi API platform is billed on a pay-as-you-go basis, with no subscription plan. It differs from products such as the Kimi membership and Kimi Code. See the product comparison.

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Billing Unit

Token: A token represents a common sequence of characters. The number of tokens used for each English character may vary. For example, a single character like “antidisestablishmentarianism” might be broken down into several tokens, while a short and common phrase like “word” might use just one token. Generally speaking, for a typical English text, 1 token is roughly equivalent to 3-4 English characters. The exact number of tokens generated by each call can be obtained through the Token Calculation API.

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Billing Logic

Model inference APIs bill both Input and Output based on usage. For K3 series models, cache writes are billed separately by TTL (5min / 1h); cached input is billed at the cache-hit price only, with no additional cache write charge. If you upload and extract content from a document and then pass the extracted content as Input to the model, the document content will also be billed based on usage. File-related APIs (file content extraction and file storage) are temporarily free: if you only upload and extract a document, the file APIs themselves incur no charges. For tips on improving cache hit rates and choosing a TTL tier, see Best Practices for Context Caching.

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Model Notes

See each model’s guide for capabilities and recommended use cases: