DeepSeek V4 Pro vs Gemini 3 Flash for reasoning: which is better in 2026?

A head-to-head look at DeepSeek V4 Pro and Gemini 3 Flash for reasoning. Benchmarks via artificialanalysis.ai, pricing as of May 2026. Compare AI models like these inside Admix.

Quick verdict

For reasoning in May 2026, DeepSeek V4 Pro edges out Gemini 3 Flash on the intelligenceIndex metric. Cheapest frontier-class pricing.

Side-by-side specs

Spec	DeepSeek	Flash
Intelligence index	72.8	63.2
Coding index	74.5	60.5
Context window	256K tokens	1M tokens
Speed (tok/s)	120	260
Input $/M	$0.27	$0.15
Output $/M	$1.10	$0.60
Released	Mar 4, 2026	Feb 12, 2026

How they handle reasoning

DeepSeek V4 Pro: Cheapest frontier-class pricing. The main caveat is weaker english creative writing.

Gemini 3 Flash: Fastest mainstream model. The main caveat is weaker on nuanced reasoning.

Cost per 1,000 queries

Assuming 1,500 input and 800 output tokens per query:

DeepSeek V4 Pro: $1.29 per 1,000 queries
Gemini 3 Flash: $0.70 per 1,000 queries

Verdict by sub-task

Best raw quality on reasoning:
Best price: Gemini 3 Flash
Longest context: Gemini 3 Flash
Fastest: Gemini 3 Flash

FAQ

Is DeepSeek V4 Pro better than Gemini 3 Flash for reasoning?

On May 2026 benchmarks (artificialanalysis.ai), DeepSeek V4 Pro ranks higher than Gemini 3 Flash for reasoning on the intelligenceIndex metric. The gap is small enough that the choice often comes down to price, context length, and tone.

Which is cheaper, DeepSeek V4 Pro or Gemini 3 Flash?

DeepSeek V4 Pro costs $0.27 input and $1.10 output per million tokens. Gemini 3 Flash costs $0.15 input and $0.60 output per million tokens.

Can I use both DeepSeek and Flash in one app?

Yes. Admix is a multi model AI chat aggregator that lets you run DeepSeek V4 Pro and Gemini 3 Flash side by side under one subscription.

Sources

Benchmarks from artificialanalysis.ai (May 2026).

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