Where is the Kimi K2 0905 documentation?

The Kimi K2 0905 documentation on OpenRouter includes the Use OpenRouter Models in Cursor: Try it with Moonshot AI's Kimi K2 blog post. The quickstart covers API keys and your first request, and the API reference lists every parameter.

How much does Kimi K2 0905 cost?

Kimi K2 0905 costs $0.60/M input tokens and $2.50/M output tokens.

What is the context length of Kimi K2 0905?

Kimi K2 0905 has a 262,144 token context window. It supports up to 98,304 completion tokens.

Does Kimi K2 0905 support tool calling and structured outputs?

Yes. Kimi K2 0905 accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

Which providers serve Kimi K2 0905?

Kimi K2 0905 is served by 1 provider on OpenRouter: NovitaAI.

What other text models does MoonshotAI have?

Kimi K3.1 Pro, Kimi K3, Kimi K2.7 Code and 4 more are other text models from MoonshotAI.

When was Kimi K2 0905 released?

Kimi K2 0905 was released on September 4, 2025. Its knowledge cutoff is December 31, 2024.

MoonshotAI: Kimi K2 0905

moonshotai/kimi-k2-0905

Model weights

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Kimi K2 0905 is the September update of Kimi K2 0711. It is a large-scale Mixture-of-Experts (MoE) language model developed by Moonshot AI, featuring 1 trillion total parameters with 32 billion active per forward pass. It supports long-context inference up to 256k tokens, extended from the previous 128k.

This update improves agentic coding with higher accuracy and better generalization across scaffolds, and enhances frontend coding with more aesthetic and functional outputs for web, 3D, and related tasks. Kimi K2 is optimized for agentic capabilities, including advanced tool use, reasoning, and code synthesis. It excels across coding (LiveCodeBench, SWE-bench), reasoning (ZebraLogic, GPQA), and tool-use (Tau2, AceBench) benchmarks. The model is trained with a novel stack incorporating the MuonClip optimizer for stable large-scale MoE training.

Modalities

In / out price

$0.60 / $2.50per 1M

Context

262K

Released

Sep 4, 2025

Knowledge cutoff

Dec 2024

Providers

This model is hosted by one provider. OpenRouter forwards every request without routing.

Latency / throughput


	$0.60	$2.50	0.75s	38 tok/s	100.00%

Input $0.60Output $2.50
38 tok/s100.00% uptime

Pricing

The average price customers actually pay for this model, next to the prices providers post. Caching and discounts mean the price actually paid is often well below the listed one.

Weighted average

Input

$0.5999/M tokens

Output

$2.498/M tokens

Kimi K2 0905 — Price history

Price history

No effective price data for this selection

		$0.600	$2.50	51.4%	100.0%

Effective in $0.600Effective out $2.50
Token share
100.0%

Uptime

Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.

Uptime (3d)

100.00%

Availability (3d)

99.99%

Availability over the last 3 days

Last 72 hours

Availability 99.99%

3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability

99.99%

When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and provider routing options.

Benchmarks

Scores on standardized evaluations and this model’s own outputs on shared benchmark prompts. Higher percentages are better — and each rank shows where this model lands among the models evaluated on that source.

Benchmark score summary for MoonshotAI: Kimi K2 0905 (Artificial Analysis and Design Arena)
Source	Benchmark	Score
Artificial Analysis	Kimi K2 0905 GPQA Diamond	76.7%
Artificial Analysis	Kimi K2 0905 HLE	6.4%
Artificial Analysis	Kimi K2 0905 IFBench	41.7%
Artificial Analysis	Kimi K2 0905 τ²-Bench Telecom	73.4%
Artificial Analysis	Kimi K2 0905 AA-LCR	53.0%
Artificial Analysis	Kimi K2 0905 CritPt	0.0%
Artificial Analysis	Kimi K2 0905 LiveCodeBench	61.0%
Artificial Analysis	Kimi K2 0905 Terminal-Bench Hard	23.5%
Artificial Analysis	Kimi K2 0905 MMLU-Pro	81.9%
Artificial Analysis	Kimi K2 0905 AIME 2025	57.3%
Design Arena	Kimi K2 0905 Preview Models Arena Code Categories Elo	1087
Design Arena	Kimi K2 0905 Preview Models Arena Website Elo	1099

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

OpenHands

AI coding agent that can run commands, browse the web, call APIs

348Mtokens

Dify.AI

Effortlessly manage autonomous agents and workflows.

136Mtokens

T3.Chat

High performance AI chat app

120Mtokens

Yumina

new

113Mtokens

Hermes Agent

Hermes Agent is an open-source, self-improving AI agent by Nous Research that runs persistently with memory across sessions, and builds reusable skills from experience. It comes with 40+ built-in tools, including web search, browser automation, and vision, plus scheduled automations and subagents.

102Mtokens

Rest of OpenRouter

164M

Top 5 Apps

28.4M

Not currently available through EU in-region routing. In-region routing docs

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MoonshotAI: Kimi K2 0905

Providers