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AI model comparison

DeepSeek V4.1 Flash vs o3 Pro

Side by side comparison of DeepSeek V4.1 Flash and o3 Pro on pricing, benchmark scores, context window, and more.

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
$0.30
Output / 1M
$1.20
Context
1.05M

The o-series of models are trained with reinforcement learning to think before they answer and perform complex reasoning.

Input / 1M
$20
Output / 1M
$80
Context
200K

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

66.7x cheaper for a typical chat

Higher intelligence score

deepseek logo

DeepSeek V4.1 Flash

24.7 vs 21.9 on Artificial Analysis

Larger context window

deepseek logo

DeepSeek V4.1 Flash

1.05M vs 200K tokens

Newer release

deepseek logo

DeepSeek V4.1 Flash

Released September 10, 2026

Benchmarks

Benchmark scores

Independent scores from Artificial Analysis. Higher is better.

Intelligence index

deepseek logoDeepSeek V4.1 Flash24.7
openai logoo3 Pro21.9

Coding index

deepseek logoDeepSeek V4.1 FlashNot available
openai logoo3 ProNot available

Agentic index

deepseek logoDeepSeek V4.1 FlashNot available
openai logoo3 ProNot available

Pricing

DeepSeek V4.1 Flash vs o3 Pro API pricing

Per-token API rates. Cheaper option highlighted.

Metricdeepseek logoDeepSeek V4.1 Flashopenai logoo3 Pro
Input tokensPer 1M tokens$0.30$20
Output tokensPer 1M tokens$1.20$80
Cached input (read)Per 1M tokens$0.01Not available
Cache writePer 1M tokensNot availableNot available
Web searchPer requestNot available$0.01

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

deepseek logoDeepSeek V4.1 Flash$1.20
openai logoo3 Pro$80

Coding task

30K in, 4K out

deepseek logoDeepSeek V4.1 Flash$13.80$4.98 cached
openai logoo3 Pro$920

Long document summary

150K in, 2K out

deepseek logoDeepSeek V4.1 Flash$47.40$3.30 cached
openai logoo3 Pro$3160

Specs

Context window and capabilities

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

Metricdeepseek logoDeepSeek V4.1 Flashopenai logoo3 Pro
Context window1.05M tokens200K tokens
Max output944K tokens100K tokens
Input typesImage, TextFile, Image, Text
Output typesTextText
Reasoning effort levelsMax, High, Low, NoneNot available
Default reasoning effortHighNot available
Release dateSeptember 10, 2026June 10, 2025

Features

Supported features

API features available for each model.

Metricdeepseek logoDeepSeek V4.1 Flashopenai logoo3 Pro
Tool callingSupportedSupported
Structured outputsSupportedSupported
JSON modeSupportedSupported
ReasoningSupportedSupported
TemperatureSupportedNot supported
Stop sequencesSupportedNot supported
Deterministic seedSupportedSupported
Verbosity controlNot supportedNot supported

Our take

DeepSeek V4.1 Flash is 66.7x cheaper for a typical chat. DeepSeek V4.1 Flash scores higher on the Artificial Analysis Intelligence Index (24.7 vs 21.9). DeepSeek V4.1 Flash has the larger context window (1.05M vs 200K tokens). 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 DeepSeek V4.1 Flash or o3 Pro cheaper?

DeepSeek V4.1 Flash is cheaper for a typical chat (2K input tokens and 500 output tokens). DeepSeek V4.1 Flash costs $0.30 per 1M input tokens and $1.20 per 1M output tokens, while o3 Pro costs $20 per 1M input tokens and $80 per 1M output tokens.

Which has a bigger context window, DeepSeek V4.1 Flash or o3 Pro?

DeepSeek V4.1 Flash supports up to 1.05M tokens of context, compared with 200K for o3 Pro.

Is DeepSeek V4.1 Flash smarter than o3 Pro?

On the Artificial Analysis Intelligence Index, DeepSeek V4.1 Flash scores 24.7 and o3 Pro scores 21.9, putting DeepSeek V4.1 Flash ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.

Can I use DeepSeek V4.1 Flash and o3 Pro at the same time?

Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see DeepSeek V4.1 Flash and o3 Pro answer side by side and keep the better response.

deepseek logoopenai logo

Why choose? Ask both.

Send one prompt to DeepSeek V4.1 Flash and o3 Pro at the same time. Compare the answers side by side and keep the best one.

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