Key Takeaways
Gemini 2.5 Pro wins:
- Cheaper input tokens
- Larger context window
- Faster response time
- Higher intelligence benchmark
- Better at coding
- Better at math
GPT-5.1 wins:
- Has reasoning mode
Price Advantage
Gemini 2.5 Pro
Benchmark Advantage
Gemini 2.5 Pro
Context Window
Gemini 2.5 Pro
Speed
Gemini 2.5 Pro
Pricing Comparison
Price Comparison
| Metric | Gemini 2.5 Pro | GPT-5.1 | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $1.00 | $1.25 | Gemini 2.5 Pro |
| Output (per 1M tokens) | $10.00 | $10.00 | Tie |
| Cache Read (per 1M) | $0.13 | $0.13 | Tie |
| Cache Write (per 1M) | $0.38 | N/A | Gemini 2.5 Pro |
Using a 3:1 input/output ratio, Gemini 2.5 Pro is 5% cheaper overall.
Gemini 2.5 Pro Providers
No provider data available
GPT-5.1 Providers
No provider data available
Benchmark Comparison
7
Benchmarks Compared
6
Gemini 2.5 Pro Wins
0
GPT-5.1 Wins
Benchmark Scores
| Benchmark | Gemini 2.5 Pro | GPT-5.1 | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 34.6 | 27.4 | |
Coding Index Code generation & understanding | 31.9 | 27.3 | |
Math Index Mathematical reasoning | 87.7 | 38.0 | |
MMLU Pro Academic knowledge | 86.2 | 80.1 | |
GPQA Graduate-level science | 84.4 | 64.3 | |
LiveCodeBench Competitive programming | 80.1 | 49.4 | |
AIME Competition math | 88.7 | - | - |
Gemini 2.5 Pro shows stronger mathematical reasoning abilities.
Cost vs Quality
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Y-axis:
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Gemini 2.5 Pro
Other models
Context & Performance
Context Window
Gemini 2.5 Pro
1,048,576
tokens
GPT-5.1
400,000
tokens
Gemini 2.5 Pro has a 62% larger context window.
Speed Performance
| Metric | Gemini 2.5 Pro | GPT-5.1 | Winner |
|---|---|---|---|
| Tokens/second | 125.9 tok/s | 70.0 tok/s | |
| Time to First Token | 20.54s | 0.76s |
Gemini 2.5 Pro responds 80% faster on average.
Capabilities
Feature Comparison
| Feature | Gemini 2.5 Pro | GPT-5.1 |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | Gemini 2.5 Pro | GPT-5.1 |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | OpenAI | |
| Released | Jun 2025 | Nov 2025 |
Gemini 2.5 Pro Modalities
Input
textimagefileaudiovideo
Output
text
GPT-5.1 Modalities
Input
imagetextfile
Output
text