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What is Kimi K3?

Kimi K3 is Moonshot AI’s most advanced model, designed for high-end reasoning, software engineering, multimodal understanding, knowledge work, and agentic AI applications. The model has 2.8 trillion parameters and is built on Kimi Delta Attention, a hybrid linear attention mechanism created for long-context performance. It also uses Attention Residuals and supports a native context window of up to 1 million tokens. This makes Kimi K3 suitable for tasks involving large codebases, long research materials, enterprise documentation, multi-file analysis, legal documents, technical manuals, and complex workflows. Kimi K3 always has thinking mode enabled, with reasoning effort configured through the reasoning_effort field and maximum effort currently supported as the default. Developers can use the model through an OpenAI-compatible API, making it easier to integrate with existing SDKs, clients, and application infrastructure. The model supports streaming responses with separate reasoning and final-answer deltas, allowing applications to display reasoning progress and final content differently. Kimi K3 also supports strict structured output with JSON Schema, partial mode for continuing from a prefix, custom tool calling, required tool use, and dynamic tool loading through system messages. Its vision capabilities support image and video inputs through base64 or uploaded files, enabling analysis of visual content alongside text. Automatic context caching helps workflows that reuse long prefixes, such as large knowledge bases or persistent system context, without requiring developers to manage cache IDs manually. By combining frontier-scale parameters, long-context processing, visual input, structured outputs, tool orchestration, and developer-friendly API compatibility, Kimi K3 gives teams a strong foundation for advanced AI agents, coding assistants, research systems, enterprise automation, and multimodal applications.

What is Grok Code Fast 1?

Grok Code Fast 1 is the latest model in the Grok family, engineered to deliver fast, economical, and developer-friendly performance for agentic coding. Recognizing the inefficiencies of slower reasoning models, the team at xAI built it from the ground up with a fresh architecture and a dataset tailored to software engineering. Its training corpus combines programming-heavy pre-training with real-world code reviews and pull requests, ensuring strong alignment with actual developer workflows. The model demonstrates versatility across the development stack, excelling at TypeScript, Python, Java, Rust, C++, and Go. In performance tests, it consistently outpaces competitors with up to 190 tokens per second, backed by caching optimizations that achieve over 90% hit rates. Integration with launch partners like GitHub Copilot, Cursor, Cline, and Roo Code makes it instantly accessible for everyday coding tasks. Grok Code Fast 1 supports everything from building new applications to answering complex codebase questions, automating repetitive edits, and resolving bugs in record time. The cost structure is intentionally designed to maximize accessibility, at just $0.20 per million input tokens and $1.50 per million outputs. Real-world human evaluations complement benchmark scores, confirming that the model performs reliably in day-to-day software engineering. For developers, teams, and platforms, Grok Code Fast 1 offers a future-ready solution that blends speed, affordability, and practical coding intelligence.

Media

Media

Integrations Supported

C
C#
C++
Cline
Go
Java
JavaScript
OpenCode
PHP
Python
Rust
Shiori
TypeScript
Visual Studio Code
Bash
EaseMate AI
OpenCode Go
Solidity

Integrations Supported

C
C#
C++
Cline
Go
Java
JavaScript
OpenCode
PHP
Python
Rust
Shiori
TypeScript
Visual Studio Code
GitHub Copilot
Kilo Code

API Availability

Has API

API Availability

Has API

Pricing Information

$3 per 1M tokens (input)
Kimi K3 is priced per 1 million tokens:

Cached input: $0.30
Uncached input: $3.00
Output: $15.00
Context window: 1,048,576 tokens

Cached inputs cost 90% less than uncached inputs, while generated output is the most expensive token category. Prices exclude applicable taxes, which are calculated based on the customer’s jurisdiction.

Pricing Information

$0.20 per million input tokens
$0.20 per million input tokens
$1.50 per million output tokens
$0.02 per million cached tokens
Free Version
Free Trial Offered?

Supported Platforms

SaaS

Supported Platforms

SaaS
Windows
Mac
Linux

Customer Service / Support

Web-Based Support

Customer Service / Support

Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub

Company Facts

Organization Name

Moonshot AI

Date Founded

2023

Company Location

China

Company Website

kimi.ai

Company Facts

Organization Name

SpaceXAI

Date Founded

2023

Company Location

United States

Company Website

x.ai

Categories and Features

AI Coding Models

Not specified

AI Models

Not specified

AI Reasoning Models

Not specified

Foundation Models

Not specified

Large Language Models

Not specified

Categories and Features

Agentic AI

Not specified

AI Coding Agents

Not specified

AI Coding Models

Not specified

AI Models

Not specified

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