Model Comparison
Gemini 1.5 Flash (May '24)
vs. Gemini 3.1 Flash-Lite
Comparing 2 AI models · 11 benchmarks · Google
Recommended Pick
Go Gemini 3.1 Flash-Lite 6 metric wins Strongest on: Throughput, Reasoning, Intelligence
Lowest Price
Gemini 1.5 Flash (May '24)
$0.00/1M input price
Best Reasoning
Gemini 3.1 Flash-Lite
44.0 reasoning score
Blends available reasoning benchmarks
Best for Coding
Gemini 3.1 Flash-Lite
30.1 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 (May '24) is ∞x cheaper on input tokens than Gemini 3.1 Flash-Lite.
Reasoning gap
Gemini 3.1 Flash-Lite leads Gemini 1.5 Flash (May '24) by 21.6 points on reasoning.
Top-pick rationale
Gemini 3.1 Flash-Lite wins 6 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 (May '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 3.1 Flash-Lite
TTFT
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Time
—
tok/s
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Tokens
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Cost
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Which answer was more useful?
Full Comparison
| Metric | Go Gemini 1.5 Flash (May '24) | Top Pick Go Gemini 3.1 Flash-Lite |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.00/1M | $0.25/1M |
| Output Cost | $0.00/1M | $1.50/1M |
| Blended (3:1) | — | $0.56/1M |
| Specifications | ||
| Organization | ||
| Release Date | May 14, 2024 | Mar 3, 2026 |
| Performance & Speed | ||
| Throughput | — | 289.7 tok/s |
| TTFT | — | 5253ms |
| Latency | — | 5253ms |
| Composite Indices | ||
| Value Score | — | 100.0 |
| Reasoning Score | 22.4 | 44.0 |
| Intelligence | 10.5 | 33.5 |
| Coding | — | 30.1 |
| Standard Benchmarks | ||
| GPQA | 32.4% | 82.2% |
| MMLU Pro | 57.4% | — |
| HLE | 4.2% | 16.2% |
| LiveCodeBench | 19.6% | — |
| MATH 500 | 55.4% | — |
| AIME (Original) | 9.3% | — |
| SciCode | 18.1% | 41.9% |
| LCR | — | 65.3% |
| IFBench | — | 77.2% |
| TAU-bench v2 | — | 31.3% |
| TerminalBench Hard | — | 24.2% |
Key Takeaways
Gemini 1.5 Flash (May '24) offers the best value at $0.00/1M, making it ideal for high-volume applications and cost-conscious projects.
Gemini 3.1 Flash-Lite has the strongest reasoning profile with a 44.0 reasoning score, combining the available reasoning-heavy benchmarks.
Gemini 3.1 Flash-Lite reaches a 30.1 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 (May '24)
- Cost-sensitive applications
- High-volume processing
Gemini 3.1 Flash-Lite
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
