Model Comparison
Gemini 1.5 Flash (Sep '24)
vs. Gemini 2.5 Flash-Lite (Non-reasoning)
Comparing 2 AI models · 12 benchmarks · Google
Recommended Pick
Go Gemini 2.5 Flash-Lite (Non-reasoning) 8 metric wins Strongest on: Throughput, Reasoning, GPQA
Lowest Price
Gemini 1.5 Flash (Sep '24)
$0.00/1M input price
Best Reasoning
Gemini 2.5 Flash-Lite (Non-reasoning)
39.6 reasoning score
Blends available reasoning benchmarks
Best for Coding
Gemini 2.5 Flash-Lite (Non-reasoning)
7.4 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 (Sep '24) is ∞x cheaper on input tokens than Gemini 2.5 Flash-Lite (Non-reasoning).
Reasoning gap
Gemini 2.5 Flash-Lite (Non-reasoning) leads Gemini 1.5 Flash (Sep '24) by 6.7 points on reasoning.
Top-pick rationale
Gemini 2.5 Flash-Lite (Non-reasoning) wins 8 measurable categories, including Throughput, Reasoning, GPQA, MMLU Pro.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
Gemini 1.5 Flash (Sep '24)
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 2.5 Flash-Lite (Non-reasoning)
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
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Which answer was more useful?
Full Comparison
| Metric | Go Gemini 1.5 Flash (Sep '24) | Top Pick Go Gemini 2.5 Flash-Lite (Non-reasoning) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.00/1M | $0.10/1M |
| Output Cost | $0.00/1M | $0.40/1M |
| Blended (3:1) | — | $0.18/1M |
| Specifications | ||
| Organization | ||
| Release Date | Sep 24, 2024 | Jun 17, 2025 |
| Performance & Speed | ||
| Throughput | — | 229.0 tok/s |
| TTFT | — | 363ms |
| Latency | — | 363ms |
| Composite Indices | ||
| Value Score | — | 100.0 |
| Reasoning Score | 32.9 | 39.6 |
| Intelligence | 13.8 | 12.7 |
| Coding | — | 7.4 |
| Math | — | 35.3 |
| Standard Benchmarks | ||
| GPQA | 46.3% | 47.4% |
| MMLU Pro | 68.0% | 72.4% |
| HLE | 3.5% | 3.7% |
| LiveCodeBench | 27.3% | 40.0% |
| MATH 500 | 82.7% | 92.6% |
| AIME 2025 | — | 35.3% |
| AIME (Original) | 18.0% | 50.0% |
| SciCode | 26.7% | 17.7% |
| LCR | — | 31.3% |
| IFBench | — | 31.5% |
| TAU-bench v2 | — | 19.0% |
| TerminalBench Hard | — | 2.3% |
Key Takeaways
Gemini 1.5 Flash (Sep '24) offers the best value at $0.00/1M, making it ideal for high-volume applications and cost-conscious projects.
Gemini 2.5 Flash-Lite (Non-reasoning) has the strongest reasoning profile with a 39.6 reasoning score, combining the available reasoning-heavy benchmarks.
Gemini 2.5 Flash-Lite (Non-reasoning) reaches a 7.4 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 (Sep '24)
- Cost-sensitive applications
- High-volume processing
Gemini 2.5 Flash-Lite (Non-reasoning)
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
