Model Comparison
Gemini 2.5 Pro
vs. Gemini 3.5 Flash (high)
Comparing 2 AI models · 12 benchmarks · Google
Recommended Pick
Go Gemini 3.5 Flash (high) 14 metric wins Strongest on: Output price, Blended price, Throughput
Best Value
Gemini 2.5 Pro
100.0 value score
70.5 reasoning / $3.44/1M
Lowest Price
Gemini 2.5 Pro
$1.25/1M input price
Best Reasoning
Gemini 2.5 Pro
70.5 reasoning score
Blends available reasoning benchmarks
Best for Coding
Gemini 3.5 Flash (high)
45.0 coding index
Composite Indices
Higher is better; speed and price are normalized
Standard Benchmarks
Only benchmarks with data are shown
Differences That Matter
Best value
Gemini 2.5 Pro has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
Gemini 2.5 Pro is 1.2x cheaper on input tokens than Gemini 3.5 Flash (high).
Speed gap
Gemini 3.5 Flash (high) generates about 1.7x as many tokens per second as Gemini 2.5 Pro.
Reasoning gap
Gemini 2.5 Pro leads Gemini 3.5 Flash (high) by 9.3 points on reasoning.
Coding gap
Gemini 3.5 Flash (high) leads Gemini 2.5 Pro by 13.0 points on coding.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
Gemini 2.5 Pro
TTFT
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Time
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tok/s
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Tokens
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Cost
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Gemini 3.5 Flash (high)
TTFT
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Time
—
tok/s
—
Tokens
—
Cost
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Which answer was more useful?
Full Comparison
| Metric | Go Gemini 2.5 Pro | Top Pick Go Gemini 3.5 Flash (high) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $1.25/1M | $1.50/1M |
| Output Cost | $10.00/1M | $9.00/1M |
| Blended (3:1) | $3.44/1M | $3.38/1M |
| Specifications | ||
| Organization | ||
| Release Date | Jun 5, 2025 | May 19, 2026 |
| Performance & Speed | ||
| Throughput | 131.2 tok/s | 218.8 tok/s |
| TTFT | 21230ms | 16405ms |
| Latency | 21230ms | 16405ms |
| Composite Indices | ||
| Value Score | 100.0 | 88.4 |
| Reasoning Score | 70.5 | 61.1 |
| Intelligence | 27.0 | 50.2 |
| Coding | 32.0 | 45.0 |
| Math | 87.7 | — |
| Standard Benchmarks | ||
| GPQA | 84.4% | 92.2% |
| MMLU Pro | 86.2% | — |
| HLE | 21.1% | 41.0% |
| LiveCodeBench | 80.1% | — |
| MATH 500 | 96.7% | — |
| AIME 2025 | 87.7% | — |
| AIME (Original) | 88.7% | — |
| SciCode | 42.8% | 53.1% |
| LCR | 66.0% | 69.3% |
| IFBench | 48.7% | 76.3% |
| TAU-bench v2 | 54.1% | 95.3% |
| TerminalBench Hard | 26.5% | 40.9% |
Key Takeaways
Gemini 2.5 Pro offers the best value at $1.25/1M, making it ideal for high-volume applications and cost-conscious projects.
Gemini 2.5 Pro has the strongest reasoning profile with a 70.5 reasoning score, combining the available reasoning-heavy benchmarks.
Gemini 3.5 Flash (high) reaches a 45.0 coding index, making it the top choice for software development and code generation tasks.
All models support context windows of ∞+ tokens, suitable for processing lengthy documents and maintaining extended conversations.
When to Choose Each Model
Gemini 2.5 Pro
- Cost-sensitive applications
- High-volume processing
- Complex reasoning tasks
- Research & analysis
Gemini 3.5 Flash (high)
- Code generation
- Software development
