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AI model comparison

Kimi K3.1 Pro vs DeepSeek V4.1 Flash

Side by side comparison of Kimi K3.1 Pro and DeepSeek V4.1 Flash on pricing, benchmark scores, context window, and more.

Kimi K3.1 Pro is Moonshot AI's flagship open-weight multimodal reasoning model and a post-trained successor to Kimi K3, with a 1M-token context window.

Input / 1M
$2
Output / 1M
$10
Context
1.05M

DeepSeek V4.1 Flash is a sparse mixture-of-experts model from DeepSeek, and the first built on the company's Causal Encoder-Decoder (CED) architecture.

Input / 1M
$0.02
Output / 1M
$1
Context
1.05M

Comparing image generators? Compare image models

At a glance

Quick verdict

How the two models stack up on the things people ask about most.

Lower price

deepseek logo

DeepSeek V4.1 Flash

16.7x cheaper for a typical chat

Higher intelligence score

moonshotai logo

Kimi K3.1 Pro

55.1 vs 24.7 on Artificial Analysis

Larger context window

Tie

1.05M vs 1.05M tokens

Newer release

moonshotai logo

Kimi K3.1 Pro

Released October 23, 2026

Benchmarks

Benchmark scores

Independent scores from Artificial Analysis. Higher is better.

Intelligence index

moonshotai logoKimi K3.1 Pro55.1
deepseek logoDeepSeek V4.1 Flash24.7

Coding index

moonshotai logoKimi K3.1 ProNot available
deepseek logoDeepSeek V4.1 FlashNot available

Agentic index

moonshotai logoKimi K3.1 ProNot available
deepseek logoDeepSeek V4.1 FlashNot available

Pricing

Kimi K3.1 Pro vs DeepSeek V4.1 Flash API pricing

Per-token API rates. Cheaper option highlighted.

Metricmoonshotai logoKimi K3.1 Prodeepseek logoDeepSeek V4.1 Flash
Input tokensPer 1M tokens$2$0.02
Output tokensPer 1M tokens$10$1
Cached input (read)Per 1M tokens$0.20$0.02
Cache writePer 1M tokensNot availableNot available

What it costs in practice

Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.

Chat message

2K in, 500 out

moonshotai logoKimi K3.1 Pro$9
deepseek logoDeepSeek V4.1 Flash$0.54

Coding task

30K in, 4K out

moonshotai logoKimi K3.1 Pro$100$46 cached
deepseek logoDeepSeek V4.1 Flash$4.60$4.45 cached

Long document summary

150K in, 2K out

moonshotai logoKimi K3.1 Pro$320$50 cached
deepseek logoDeepSeek V4.1 Flash$5$4.25 cached

Specs

Context window and capabilities

How much each model can read, how much it can write, and what it accepts as input.

Metricmoonshotai logoKimi K3.1 Prodeepseek logoDeepSeek V4.1 Flash
Context window1.05M tokens1.05M tokens
Max output944K tokens944K tokens
Input typesImage, Text, VideoImage, Text
Output typesTextText
Reasoning effort levelsMax, High, Low, NoneMax, High, Low, None
Default reasoning effortMaxHigh
Release dateOctober 23, 2026September 10, 2026

Features

Supported features

API features available for each model.

Metricmoonshotai logoKimi K3.1 Prodeepseek logoDeepSeek V4.1 Flash
Tool callingSupportedSupported
Structured outputsSupportedSupported
JSON modeSupportedSupported
ReasoningSupportedSupported
TemperatureNot supportedSupported
Stop sequencesSupportedSupported
Deterministic seedNot supportedSupported
Verbosity controlNot supportedNot supported

Our take

DeepSeek V4.1 Flash is 16.7x cheaper for a typical chat. Kimi K3.1 Pro scores higher on the Artificial Analysis Intelligence Index (55.1 vs 24.7). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.

FAQ

Frequently asked questions

Is Kimi K3.1 Pro or DeepSeek V4.1 Flash cheaper?

DeepSeek V4.1 Flash is cheaper for a typical chat (2K input tokens and 500 output tokens). DeepSeek V4.1 Flash costs $0.02 per 1M input tokens and $1 per 1M output tokens, while Kimi K3.1 Pro costs $2 per 1M input tokens and $10 per 1M output tokens.

Which has a bigger context window, Kimi K3.1 Pro or DeepSeek V4.1 Flash?

Kimi K3.1 Pro supports up to 1.05M tokens of context, compared with 1.05M for DeepSeek V4.1 Flash.

Is Kimi K3.1 Pro smarter than DeepSeek V4.1 Flash?

On the Artificial Analysis Intelligence Index, Kimi K3.1 Pro scores 55.1 and DeepSeek V4.1 Flash scores 24.7, putting Kimi K3.1 Pro ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.

Can I use Kimi K3.1 Pro and DeepSeek V4.1 Flash at the same time?

Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see Kimi K3.1 Pro and DeepSeek V4.1 Flash answer side by side and keep the better response.

moonshotai logodeepseek logo

Why choose? Ask both.

Send one prompt to Kimi K3.1 Pro and DeepSeek V4.1 Flash at the same time. Compare the answers side by side and keep the best one.

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