Model Comparison
Gemini 3.5 Flash (high)
vs. GPT-5.4 mini (xhigh)
Comparing 2 AI models · 7 benchmarks · Google, OpenAI
Recommended Pick
Go Gemini 3.5 Flash (high) 8 metric wins Strongest on: Throughput, Reasoning, Intelligence
Best Value
GPT-5.4 mini (xhigh)
100.0 value score
54.3 reasoning / $1.69/1M
Lowest Price
GPT-5.4 mini (xhigh)
$0.75/1M input price
Best Reasoning
Gemini 3.5 Flash (high)
62.8 reasoning score
Blends available reasoning benchmarks
Best for Coding
GPT-5.4 mini (xhigh)
51.5 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
GPT-5.4 mini (xhigh) has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
GPT-5.4 mini (xhigh) is 2.0x cheaper on input tokens than Gemini 3.5 Flash (high).
Speed gap
Gemini 3.5 Flash (high) generates about 1.3x as many tokens per second as GPT-5.4 mini (xhigh).
Reasoning gap
Gemini 3.5 Flash (high) leads GPT-5.4 mini (xhigh) by 8.5 points on reasoning.
Coding gap
GPT-5.4 mini (xhigh) leads Gemini 3.5 Flash (high) by 6.5 points on coding.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
Gemini 3.5 Flash (high)
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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GPT-5.4 mini (xhigh)
OpenAI
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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Which answer was more useful?
Full Comparison
| Metric | Top Pick Go Gemini 3.5 Flash (high) | Op GPT-5.4 mini (xhigh) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $1.50/1M | $0.75/1M |
| Output Cost | $9.00/1M | $4.50/1M |
| Blended (3:1) | $3.38/1M | $1.69/1M |
| Specifications | ||
| Organization | OpenAI | |
| Release Date | May 19, 2026 | Mar 17, 2026 |
| Performance & Speed | ||
| Throughput | 227.2 tok/s | 173.4 tok/s |
| TTFT | 20541ms | 5541ms |
| Latency | 20541ms | 5541ms |
| Composite Indices | ||
| Value Score | 57.8 | 100.0 |
| Reasoning Score | 62.8 | 54.3 |
| Intelligence | 55.3 | 48.9 |
| Coding | 45.0 | 51.5 |
| Standard Benchmarks | ||
| GPQA | 92.2% | 87.5% |
| HLE | 41.0% | 26.6% |
| SciCode | 53.1% | 49.9% |
| LCR | 69.3% | 69.3% |
| IFBench | 76.3% | 73.3% |
| TAU-bench v2 | 95.3% | 83.3% |
| TerminalBench Hard | 40.9% | 52.3% |
Key Takeaways
GPT-5.4 mini (xhigh) offers the best value at $0.75/1M, making it ideal for high-volume applications and cost-conscious projects.
Gemini 3.5 Flash (high) has the strongest reasoning profile with a 62.8 reasoning score, combining the available reasoning-heavy benchmarks.
GPT-5.4 mini (xhigh) reaches a 51.5 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 3.5 Flash (high)
- Complex reasoning tasks
- Research & analysis
GPT-5.4 mini (xhigh)
- Cost-sensitive applications
- High-volume processing
- Code generation
- Software development
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