Model Comparison

Gemini 3 Flash vs DeepSeek-V3.1Which is better in 2026?

Gemini 3 Flash significantly outperforms across most benchmarks. DeepSeek-V3.1 is 2.5x cheaper per token.

Verdict: Gemini 3 Flash vs DeepSeek-V3.1 — which is better?

Gemini 3 Flash (by Google) and DeepSeek-V3.1 (by DeepSeek) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

Gemini 3 Flash outperforms in 4 benchmarks (AIME 2025, GPQA, Humanity's Last Exam, SWE-Bench Verified), while DeepSeek-V3.1 is better at 1 benchmark (SimpleQA). Gemini 3 Flash significantly outperforms across most benchmarks.

On price, DeepSeek-V3.1 is roughly 2.5x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Gemini 3 Flash also accepts a larger context window (1,000,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose Gemini 3 Flash if…

  • you want the strongest raw capability — it leads on 4 of 5 shared benchmarks
  • you process long inputs — it offers a 1,000,000 token context window
  • you want the most recent training data — it shipped Dec 2025

Choose DeepSeek-V3.1 if…

  • cost matters — it's about 2.5x cheaper per token
  • you need open weights you can self-host or fine-tune
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Performance Benchmarks

Comparative analysis across standard metrics

5 benchmarks

Gemini 3 Flash outperforms in 4 benchmarks (AIME 2025, GPQA, Humanity's Last Exam, SWE-Bench Verified), while DeepSeek-V3.1 is better at 1 benchmark (SimpleQA).

Gemini 3 Flash significantly outperforms across most benchmarks.

Mon Jun 08 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

DeepSeek-V3.1 costs less

For input processing, Gemini 3 Flash ($0.50/1M tokens) is 1.9x more expensive than DeepSeek-V3.1 ($0.27/1M tokens).

For output processing, Gemini 3 Flash ($3.00/1M tokens) is 3.0x more expensive than DeepSeek-V3.1 ($1.00/1M tokens).

In conclusion, Gemini 3 Flash is more expensive than DeepSeek-V3.1.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Mon Jun 08 2026 • llm-stats.com
Google
Gemini 3 Flash
Input tokens$0.50
Output tokens$3.00
Best providerGoogle
DeepSeek
DeepSeek-V3.1
Input tokens$0.27
Output tokens$1.00
Best providerDeepinfra
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Gemini 3 Flash accepts 1,000,000 input tokens compared to DeepSeek-V3.1's 163,840 tokens. DeepSeek-V3.1 can generate longer responses up to 163,840 tokens, while Gemini 3 Flash is limited to 65,536 tokens.

Google
Gemini 3 Flash
Input1,000,000 tokens
Output65,536 tokens
DeepSeek
DeepSeek-V3.1
Input163,840 tokens
Output163,840 tokens
Mon Jun 08 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Gemini 3 Flash supports multimodal inputs, whereas DeepSeek-V3.1 does not.

Gemini 3 Flash can handle both text and other forms of data like images, making it suitable for multimodal applications.

Gemini 3 Flash

Text
Images
Audio
Video

DeepSeek-V3.1

Text
Images
Audio
Video

License

Usage and distribution terms

Gemini 3 Flash is licensed under a proprietary license, while DeepSeek-V3.1 uses MIT.

License differences may affect how you can use these models in commercial or open-source projects.

Gemini 3 Flash

Proprietary

Closed source

DeepSeek-V3.1

MIT

Open weights

Release Timeline

When each model was launched

Gemini 3 Flash was released on 2025-12-17, while DeepSeek-V3.1 was released on 2025-01-10.

Gemini 3 Flash is 11 months newer than DeepSeek-V3.1.

Gemini 3 Flash

Dec 17, 2025

5 months ago

11mo newer
DeepSeek-V3.1

Jan 10, 2025

1.4 years ago

Knowledge Cutoff

When training data ends

Gemini 3 Flash has a documented knowledge cutoff of 2025-01-31, while DeepSeek-V3.1's cutoff date is not specified.

We can confirm Gemini 3 Flash's training data extends to 2025-01-31, but cannot make a direct comparison without DeepSeek-V3.1's cutoff date.

Gemini 3 Flash

Jan 2025

DeepSeek-V3.1

—

Provider Availability

Gemini 3 Flash is available from Google. DeepSeek-V3.1 is available from DeepInfra, Novita.

Gemini 3 Flash

google logo
Google
Input Price:Input: $0.50/1MOutput Price:Output: $3.00/1M

DeepSeek-V3.1

deepinfra logo
Deepinfra
Input Price:Input: $0.27/1MOutput Price:Output: $1.00/1M
novita logo
Novita
Input Price:Input: $0.27/1MOutput Price:Output: $1.00/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Google
Larger context window (1,000,000 tokens)
Supports multimodal inputs
Higher AIME 2025 score (99.7% vs 49.8%)
Higher GPQA score (90.4% vs 74.9%)
Higher Humanity's Last Exam score (43.5% vs 15.9%)
Higher SWE-Bench Verified score (78.0% vs 66.0%)
DeepSeek
Less expensive input tokens
Less expensive output tokens
Has open weights
Higher SimpleQA score (93.4% vs 68.7%)

Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini 3 Flash
DeepSeek
DeepSeek-V3.1

FAQ

Common questions about Gemini 3 Flash vs DeepSeek-V3.1.

Which is better, Gemini 3 Flash or DeepSeek-V3.1?

Gemini 3 Flash significantly outperforms across most benchmarks. Gemini 3 Flash is made by Google and DeepSeek-V3.1 is made by DeepSeek. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Gemini 3 Flash compare to DeepSeek-V3.1 in benchmarks?

Gemini 3 Flash scores Vending-Bench 2: 100.0%, AIME 2025: 99.7%, Global PIQA: 92.8%, MMMLU: 91.8%, GPQA: 90.4%. DeepSeek-V3.1 scores SimpleQA: 93.4%, MMLU-Redux: 91.8%, MMLU-Pro: 83.7%, GPQA: 74.9%, CodeForces: 69.7%.

Is Gemini 3 Flash cheaper than DeepSeek-V3.1?

DeepSeek-V3.1 is 1.9x cheaper for input tokens. Gemini 3 Flash costs $0.50/M input and $3.00/M output via google. DeepSeek-V3.1 costs $0.27/M input and $1.00/M output via deepinfra.

What are the context window sizes for Gemini 3 Flash and DeepSeek-V3.1?

Gemini 3 Flash supports 1.0M tokens and DeepSeek-V3.1 supports 164K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Gemini 3 Flash and DeepSeek-V3.1?

Key differences include context window (1.0M vs 164K), input pricing ($0.50 vs $0.27/M), multimodal support (yes vs no), licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 3 Flash and DeepSeek-V3.1?

Gemini 3 Flash is developed by Google and DeepSeek-V3.1 is developed by DeepSeek.

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