Kimi API Platform
** – Developer platform
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What is Kimi API Platform?
Kimi API Platform is a large‑language‑model inference service that exposes Kimi’s K2 series models (including kimi-k2.6, kimi-k2.5, and kimi-k2 0905) as an OpenAI‑compatible API, enabling developers to build AI agents, code‑assistance tools, and data‑analysis workflows. The platform supports long‑context processing (up to hundreds of thousands of tokens), multi‑modal input (text, image, and video on some models), and tool calling, which lets models call external functions and execute code or fetch data. It is optimized for tasks like agent‑driven programming, deep research, legal‑document analysis, and conversation‑intelligent workflows, and it integrates with standard SDKs and frameworks such as LangChain, Dify, and Coze.
Key features include OpenAI‑style chat‑completions endpoints, JSON‑mode output that guarantees valid JSON, partial‑response mode for guiding generated text, and a growing suite of built‑in tools such as web search, Rethink, Excel analysis, code‑runner, and memory storage. Developers can estimate token usage, manage API keys and billing through a console, and plug the API into existing tooling via well‑documented SDKs in Python and Node.js. The platform also supports long‑running, multi‑step workflows via hundreds of tool‑call steps, enabling complex automation and agentic behaviors in code, research, and finance workflows.
The platform is aimed at professional developers, AI product teams, and enterprises that want to add Kimi’s large‑language‑model capabilities into their own applications, SaaS products, or internal tooling without building and hosting models themselves. It is particularly suited for companies in legal, financial, scientific, and software‑engineering domains that need high‑accuracy, long‑context reasoning alongside code generation and document analysis. At the same time, its flexible pay‑as‑you‑go plan and developer‑friendly documentation make it accessible for individual makers and small teams experimenting with AI agents or smart assistants.
Kimi API Platform pricing
Pricing model: Freemium
Kimi API Platform uses a pay‑as‑you‑go, usage‑based pricing model where costs are calculated per million tokens (MTok). For the latest models, kimi‑k2.6 is billed at 0.16 MTok for cache‑hit, 0.95 MTok for input, and 4.00 MTok for output; kimi‑k2.5 at 0.10 MTok cache‑hit, 0.60 MTok input, and 3.00 MTok output; and kimi‑k2 0905 at 0.15 MTok cache‑hit, 0.60 MTok input, and 2.50 MTok output. The platform offers flexible pay‑as‑you‑go billing for individual developers and small teams, with no fixed monthly subscription, and provides tiered usage benefits that automatically unlock higher rate limits as cumulative spend increases. For larger enterprises, Kimi offers high‑performance architecture, higher rate limits, security and compliance assurance, and dedicated technical support through custom enterprise solutions and SLAs.
Kimi API Platform pros
- OpenAI‑compatible API that works with existing OpenAI SDKs
- Support for very long context lengths for large codebases and documents
- Multiple Kimi K2 models (k2.6, k2.5, k2 0905) with different balances of speed and quality
- Strong code‑generation and agent‑programming capabilities
- Built‑in web search tool for up‑to‑date, citable information
- Pre‑built tools such as Excel analysis, code‑runner, and memory storage
- JSON‑mode output that guarantees parseable JSON responses
- Partial‑response mode to guide and control model output format
- High‑step tool‑calling support for complex, multi‑step workflows
- Excellent performance on long‑context programming and research tasks
- Built‑in date, unit, base64, and fetch tools for common utility tasks
- Official documentation and SDK guides for quick onboarding
- Integration with popular frameworks like LangChain, Dify, and Coze
- Usage‑based pricing with transparent token‑count billing
- Tiered usage benefits that unlock higher rate limits as spend increases
Kimi API Platform cons
- No direct model fine‑tuning support for end users
- Speech‑to‑text and text‑to‑speech not natively supported
- Vision capabilities limited to specific models and not universal across all plan tiers
- Pricing can escalate quickly for high‑volume, long‑context or high‑agent‑step workloads
- Complex workflows may require careful orchestration of tool calls and state management
- No built‑in UI or chat front‑end; implementation of interface is the user’s responsibility
- Rate limits and concurrency constraints may constrain some enterprise‑scale workloads
- Billing and usage monitoring are self‑managed through the console, not fully automated
Frequently asked questions about Kimi API Platform
What is the Kimi API Platform?
The Kimi API Platform is a hosted large‑language‑model service that exposes Kimi’s K2 series models (including k2.6, k2.5, and k2 0905) as an OpenAI‑compatible API endpoint. It lets developers send chat‑style requests, receive model responses, and integrate multi‑modal and tool‑calling capabilities into their own applications without managing infrastructure or model training.
Which models are available on the Kimi API Platform?
The platform currently offers several models: kimi‑k2.6 (the latest and most intelligent model with strong long‑context code and agent capabilities), kimi‑k2.5 (supporting visual and text input, thinking and non‑thinking modes, and dialogue and agent tasks), and kimi‑k2 0905 (a MoE‑based base model with 1 trillion total parameters and strong code and agent performance). Each model has distinct pricing, latency, and feature balances so developers can choose based on their workload.
Is the Kimi API compatible with OpenAI SDKs?
Yes, the Kimi API provides an OpenAI‑compatible interface for chat completions, meaning you can use the official OpenAI SDKs for Python and Node.js by simply pointing the base URL to Kimi’s endpoint. Most third‑party tools and frameworks that support OpenAI‑style APIs, such as LangChain, Dify, and Coze, can also integrate with Kimi by updating the base URL and API key.
Does Kimi support long‑context inputs?
Yes, Kimi supports very long context lengths, allowing you to pass large codebases, documents, or multi‑turn conversations into a single request. The exact limit depends on the model version, but Kimi is specifically optimized for long‑context tasks such as codebase analysis, document summarization, and multi‑step research workflows.
What built‑in tools does Kimi provide?
Kimi includes a suite of official tools such as web search (for fetching live information and authoritative sources), Rethink (for organizing ideas), Random‑Choice, Memory (for storing and retrieving conversation history and user preferences), Excel and CSV analysis, code‑runner, Quick JS (for safe JavaScript execution), date processing, URL content fetch, unit and currency conversion, and base64 encoding and decoding, all accessible via tool‑calling from the API.
Can I fine‑tune Kimi models?
Direct model fine‑tuning is not currently available for end users on the standard platform; the exposed models are fixed base models that you can prompt and tool‑call but not update. However, enterprise customers can contact Kimi’s sales team for custom model and enterprise‑scale options that may include tailored model behavior and extended capabilities.
Does Kimi support image and video input?
Certain Kimi models such as kimi‑k2.5 support visual and text input, enabling the API to reason over images and, in some cases, video, alongside textual context. This allows for image understanding, OCR‑style text extraction, and analysis of charts and tables, but the exact visual capabilities depend on the specific model and may not be present on all endpoint variants.
How is Kimi billed and what units are used?
Kimi charges per million tokens (MTok) for inputs, outputs, and cache‑hit tokens, with different rates for each model. The platform offers a flexible pay‑as‑you‑go model where you only pay for tokens consumed, and it provides transparent token‑count estimation and usage‑monitoring endpoints so you can track and budget your costs as usage scales.
Is there a free tier or trial?
The platform is primarily usage‑based without a clearly advertised free tier; instead it offers quick‑start access so developers can generate an API key and begin making calls, with costs accruing based on token usage. Enterprise and high‑volume customers may negotiate custom plans or trial arrangements directly with Kimi’s sales team, but the standard path is pay‑as‑you‑go with no fixed‑fee free tier listed on the public pricing section.