Model Comparison
Gemini 1.5 Flash-8B
vs. Gemini 2.5 Pro
Comparing 2 AI models · 12 benchmarks · Google
Recommended Pick
Go Gemini 2.5 Pro 10 metric wins Strongest on: Throughput, Reasoning, Intelligence
Lowest Price
Gemini 1.5 Flash-8B
$0.00/1M input price
Best Reasoning
Gemini 2.5 Pro
71.6 reasoning score
Blends available reasoning benchmarks
Best for Coding
Gemini 2.5 Pro
32.0 coding index
Composite Indices
Higher is better; speed and price are normalized
Standard Benchmarks
Only benchmarks with data are shown
Differences That Matter
Price gap
Gemini 1.5 Flash-8B is ∞x cheaper on input tokens than Gemini 2.5 Pro.
Reasoning gap
Gemini 2.5 Pro leads Gemini 1.5 Flash-8B by 46.8 points on reasoning.
Top-pick rationale
Gemini 2.5 Pro wins 10 measurable categories, including Throughput, Reasoning, Intelligence, GPQA.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
Gemini 1.5 Flash-8B
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Gemini 2.5 Pro
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Which answer was more useful?
Full Comparison
| Metric | Go Gemini 1.5 Flash-8B | Top Pick Go Gemini 2.5 Pro |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.00/1M | $1.25/1M |
| Output Cost | $0.00/1M | $10.00/1M |
| Blended (3:1) | — | $3.44/1M |
| Specifications | ||
| Organization | ||
| Release Date | Oct 3, 2024 | Jun 5, 2025 |
| Performance & Speed | ||
| Throughput | — | 155.2 tok/s |
| TTFT | — | 18620ms |
| Latency | — | 18620ms |
| Composite Indices | ||
| Value Score | — | 100.0 |
| Reasoning Score | 24.8 | 71.6 |
| Intelligence | 11.1 | 34.6 |
| Coding | — | 32.0 |
| Math | — | 87.7 |
| Standard Benchmarks | ||
| GPQA | 35.9% | 84.4% |
| MMLU Pro | 56.9% | 86.2% |
| HLE | 4.5% | 21.1% |
| LiveCodeBench | 21.7% | 80.1% |
| MATH 500 | 68.9% | 96.7% |
| AIME 2025 | — | 87.7% |
| AIME (Original) | 3.3% | 88.7% |
| SciCode | 22.9% | 42.8% |
| LCR | — | 66.0% |
| IFBench | — | 48.7% |
| TAU-bench v2 | — | 54.1% |
| TerminalBench Hard | — | 26.5% |
Key Takeaways
Gemini 1.5 Flash-8B offers the best value at $0.00/1M, making it ideal for high-volume applications and cost-conscious projects.
Gemini 2.5 Pro has the strongest reasoning profile with a 71.6 reasoning score, combining the available reasoning-heavy benchmarks.
Gemini 2.5 Pro reaches a 32.0 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 1.5 Flash-8B
- Cost-sensitive applications
- High-volume processing
Gemini 2.5 Pro
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
