DeepSeek V3.1 vs Gemini 2.5 Flash (Comparative Analysis)
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Comparative Analysis: DeepSeek V3.1 vs. Gemini 2.5 Flash
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Overview
Gemini 2.5 Flash was released 2 months before DeepSeek V3.1.
 DeepSeek V3.1 |  Gemini 2.5 Flash | |
|---|---|---|
Model Provider The organization behind this AI's development | DeepSeek | Google |
Input Context Window Maximum input tokens this model can process at once | 163.8K tokens | 1M tokens |
Output Token Limit Maximum output tokens this model can generate at once | 32.8K tokens | 65.5K tokens |
Release Date When this model first became publicly available | August 21, 2025 11 months ago August 21st, 2025 | June 17, 2025 1 year ago June 17th, 2025 |
Knowledge Cutoff Latest training-data date reported by the provider | March 31, 2025 | January 31, 2025 |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
DeepSeek V3.1 | Gemini 2.5 Flash | |
|---|---|---|
Input Types Supported input formats | 📝Text | 📁File🖼️Image📝Text🎵Audio🎬Video |
Reasoning Controls Defaults and configurable reasoning effort | Optional | Optional |
Output Types Supported output formats | 📝Text | 📝Text |
Tokenizer Text encoding system | DeepSeek | Gemini |
Key Features Advanced capabilities | ✓Function Calling✓Structured Output✓Reasoning ModeContent Moderation | ✓Function Calling✓Structured Output✓Reasoning ModeContent Moderation |
Open Source Model availability | Available on HuggingFace → | Proprietary |
Pricing
DeepSeek V3.1 is roughly 0.8x less expensive compared to Gemini 2.5 Flash for input tokens and roughly 0.4x less expensive for output tokens.
| DeepSeek V3.1 | Gemini 2.5 Flash | |
|---|---|---|
Input Token Cost Cost per million input tokens | $0.25 per million tokens | $0.30 per million tokens |
Output Token Cost Cost per million output tokens | $0.95 per million tokens | $2.50 per million tokens |
Web Search Cost Additional cost for each web search operation | Not specified | $0.014 per search |
Cache Read Cost Cost to reuse cached input tokens | $0.13 per million tokens | $0.03 per million tokens |
Cache Write Cost Cost to write input tokens to the cache | Not specified | $0.08 per million tokens |
Reasoning Token Cost Cost for internal reasoning tokens | Not specified | $2.50 per million tokens |
Image Input Cost Additional cost for each image input | Not specified | $0.0000003 per image |
Audio Input Cost Additional cost for audio input | Not specified | $0.000001 per unit |
Audio Cache Cost Cost to reuse cached audio input tokens | Not specified | $0.10 per million tokens |
Benchmarks
Compare relevant benchmarks between DeepSeek V3.1 and Gemini 2.5 Flash.
| DeepSeek V3.1 | Gemini 2.5 Flash | |
|---|---|---|
Best Design Arena Score Highest human-preference Elo score across design arenas | 1,149 Elo (#72 in Website (48.0% win rate)) | 1,159 Elo (#67 in Data Viz (48.4% win rate)) |
At a Glance
Quick overview of what makes DeepSeek V3.1 and Gemini 2.5 Flash unique.
DeepSeek V3.1 by DeepSeek can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 163.8K token context window. Very affordable at $0.25/M input and $0.95/M output tokens. Released August 21st, 2025.Gemini 2.5 Flash by Google understands both text and images, handles audio, analyzes video, can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 1M token context window. Reasonably priced at $0.30/M input and $2.50/M output tokens. Released June 17th, 2025.Explore More Comparisons
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Compare Gemini 2.5 Flash with:
🚀Programming
Best models for coding and development
🎨Creative & Roleplay
Models optimized for creative writing
📢Marketing
Content creation and marketing tasks
💻Technology
Technical analysis and explanations
🔬Science
Scientific research and analysis
🌐Translation
Multilingual translation tasks