Key Takeaways
DeepSeek V3.1 wins:
- Cheaper input tokens
- Cheaper output tokens
- Higher intelligence benchmark
- Better at coding
Gemini 2.5 Flash wins:
- Larger context window
- Faster response time
- Better at math
- Supports vision
- Has reasoning mode
Price Advantage
DeepSeek V3.1
Benchmark Advantage
DeepSeek V3.1
Context Window
Gemini 2.5 Flash
Speed
Gemini 2.5 Flash
Pricing Comparison
Price Comparison
| Metric | DeepSeek V3.1 | Gemini 2.5 Flash | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $0.15 | $0.30 | DeepSeek V3.1 |
| Output (per 1M tokens) | $0.75 | $2.50 | DeepSeek V3.1 |
| Cache Read (per 1M) | N/A | $0.03 | Gemini 2.5 Flash |
| Cache Write (per 1M) | N/A | $0.08 | Gemini 2.5 Flash |
Using a 3:1 input/output ratio, DeepSeek V3.1 is 65% cheaper overall.
DeepSeek V3.1 Providers
Chutes $0.20 (Cheapest)
DeepInfra $0.21
SiliconFlow $0.27
Novita $0.27
AtlasCloud $0.30
Gemini 2.5 Flash Providers
Vercel $0.30 (Cheapest)
Google AI Studio $0.30 (Cheapest)
Google $0.30 (Cheapest)
Benchmark Comparison
8
Benchmarks Compared
5
DeepSeek V3.1 Wins
1
Gemini 2.5 Flash Wins
Benchmark Scores
| Benchmark | DeepSeek V3.1 | Gemini 2.5 Flash | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 28.1 | 21.1 | |
Coding Index Code generation & understanding | 28.4 | 17.8 | |
Math Index Mathematical reasoning | 49.7 | 60.3 | |
MMLU Pro Academic knowledge | 83.3 | 80.9 | |
GPQA Graduate-level science | 73.5 | 68.3 | |
LiveCodeBench Competitive programming | 57.7 | 49.5 | |
Aider Real-world code editing | - | 55.1 | - |
AIME Competition math | - | 50.0 | - |
DeepSeek V3.1 significantly outperforms in coding benchmarks.
Cost vs Quality
X-axis:
Y-axis:
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DeepSeek V3.1
Other models
Context & Performance
Context Window
DeepSeek V3.1
32,768
tokens
Max output: 7,168 tokens
Gemini 2.5 Flash
1,048,576
tokens
Max output: 65,535 tokens
Gemini 2.5 Flash has a 97% larger context window.
Speed Performance
| Metric | DeepSeek V3.1 | Gemini 2.5 Flash | Winner |
|---|---|---|---|
| Tokens/second | 0.0 tok/s | 246.2 tok/s | |
| Time to First Token | 0.00s | 0.47s |
Gemini 2.5 Flash responds Infinity% faster on average.
Capabilities
Feature Comparison
| Feature | DeepSeek V3.1 | Gemini 2.5 Flash |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | DeepSeek V3.1 | Gemini 2.5 Flash |
|---|---|---|
| License | Open Source | Proprietary |
| Author | Deepseek | |
| Released | Aug 2025 | Jun 2025 |
DeepSeek V3.1 Modalities
Input
text
Output
text
Gemini 2.5 Flash Modalities
Input
fileimagetextaudiovideo
Output
text