Kimi K2.5
Discover Moonshot AI's Kimi K2.5, a 1T-parameter open-source agentic model featuring native multimodal capabilities, a 262K context window, and SOTA reasoning.
moonshotKimi K-seriesJanuary 27, 2026About Kimi K2.5
Learn about Kimi K2.5's capabilities, features, and how it can help you achieve better results.
A New Frontier in Agentic Intelligence
Kimi K2.5 is a flagship open-source agentic model from Moonshot AI, representing a major leap in unified multimodal intelligence. Built on a massive 1-trillion parameter Mixture-of-Experts (MoE) architecture with 32 billion active parameters, it natively integrates text, image, and video processing into a single reasoning framework. Unlike traditional LLMs, K2.5 is designed specifically for autonomous execution, featuring a unique 'Thinking' mode that allows it to self-correct and reason through complex, multi-step problems without human intervention.
Architectural Breakthroughs
The model introduces a revolutionary feature known as 'Agent Swarm,' which enables the system to dynamically coordinate up to 100 parallel sub-agents to solve massive research or engineering tasks. By achieving top-tier performance on benchmarks like SWE-Bench and AIME 2025, Kimi K2.5 effectively bridges the gap between open-source models and proprietary frontier AI, offering elite capabilities at a fraction of the operational cost. Its integration of the MoonViT-3D encoder allows for unprecedented video understanding, spanning several hours of content with high temporal accuracy.
Unmatched Efficiency
Beyond raw power, K2.5 focuses on sustainable token economics. By utilizing aggressive context caching and a highly optimized MoE structure, it delivers performance that rivals the most expensive proprietary models while maintaining a highly competitive price point of $0.60 per million input tokens. This makes it an ideal backbone for enterprises looking to deploy complex, long-context autonomous agents at scale.
Use Cases for Kimi K2.5
Discover the different ways you can use Kimi K2.5 to achieve great results.
Autonomous Software Engineering
Resolving complex GitHub issues and performing full-stack website cloning from visual UI sketches.
Olympiad-Level Math Solving
Tackling advanced mathematical proofs and competition-level problems with over 96% accuracy on AIME 2025.
Long-Form Video Reasoning
Analyzing and summarizing content from videos up to two hours long without context loss or temporal degradation.
Dynamic Research Agents
Using 'Agent Swarm' to conduct multi-threaded web research and synthesize data from hundreds of sources in parallel.
Aesthetic Frontend Generation
Converting hand-drawn UI wireframes or screenshots into polished, functional React code with expressive motion.
Autonomous Terminal Control
Executing complex bash commands and system-level operations to manage server clusters and development environments.
Strengths
Limitations
API Quick Start
fireworks/kimi-k2p5
import OpenAI from 'openai';
const client = new OpenAI({
apiKey: process.env.MOONSHOT_API_KEY,
baseURL: 'https://api.moonshot.cn/v1'
});
async function main() {
const response = await client.chat.completions.create({
model: 'kimi-k2.5',
messages: [{ role: 'user', content: 'Create a full-stack Next.js dashboard with a dark mode glassmorphism UI.' }],
max_tokens: 2048,
});
console.log(response.choices[0].message.content);
}
main();Install the SDK and start making API calls in minutes.
What People Are Saying About Kimi K2.5
See what the community thinks about Kimi K2.5
"The reasoning capabilities on AIME 2025 are absolutely insane for an open model."
"Kimi K2.5 just set the new bar for long video understanding. Finally a model that doesn't forget the start of the clip."
"Using K2.5 as a coding agent is a game changer. Its SWE-Bench score isn't just a number, you can feel the competence."
"China just released Kimi K2.5 and like clockwork the performance is on par with American frontier AI models."
"Kimi from China just destroyed OpenAI's trillion business dream... 8x cheaper."
"Kimi K2.5 is the first model that actually feels like a co-pilot rather than just a chat box."
Videos About Kimi K2.5
Watch tutorials, reviews, and discussions about Kimi K2.5
“Testing the AIME problems, Kimi K2.5 got almost everything right, even the ones GPT-4o struggled with.”
“For coding tasks, the agentic capabilities are clearly where this model shines compared to standard LLMs.”
“The open-source nature of a trillion-parameter model like this is unprecedented in the current market.”
“You're seeing logic processing here that rivaled o1 in my initial math tests.”
“The token pricing is so low it effectively kills the argument for using proprietary closed models for basic tasks.”
“The ability to process two-hour videos in one go without losing context is a massive breakthrough.”
“It's not just a chat model; it's designed from the ground up to use tools and terminals.”
“When you trigger the Swarm mode, the parallelism for web research is basically unmatched.”
“This is Moonshot AI putting the world on notice that they have the compute and the talent.”
“Seeing it navigate a live terminal to fix a bug is the future of autonomous engineering.”
“Kimi K2.5's jump in the BrowseComp benchmark suggests it can navigate the web with a level of persistence we haven't seen.”
“The fact that it's unifying vision and thinking modes into one architecture is the real architectural story here.”
“Performance on MMLU and GSM8k proves that the data quality used for training was top-tier.”
“Unlike previous versions, the video understanding here doesn't suffer from temporal degradation.”
“If you're a developer, the OpenAI compatibility makes switching to this model for testing almost zero-effort.”
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Pro Tips for Kimi K2.5
Expert tips to help you get the most out of Kimi K2.5 and achieve better results.
Leverage Thinking Mode
Explicitly prompt the model with 'Think step-by-step' to activate its reasoning mode for logic-heavy math or coding tasks.
Video Context Advantage
Use the model's MoonViT-3D encoder to process extremely long videos; it excels at finding specific details in 2-hour clips.
Agent Orchestration
For large projects, utilize the swarm capability to let K2.5 break down tasks into sub-tasks for faster execution.
Cache Hit Savings
Structure your API calls to take advantage of Moonshot's aggressive context caching to reduce input costs by up to 75%.
Testimonials
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Frequently Asked Questions About Kimi K2.5
Find answers to common questions about Kimi K2.5