Key Takeaways
Gemini 3 Flash Preview wins:
- Cheaper input tokens
- Cheaper output tokens
- Larger context window
- Faster response time
- Has reasoning mode
GPT-5.2 Pro wins:
- Higher intelligence benchmark
- Better at coding
- Better at math
Price Advantage
Gemini 3 Flash Preview
Benchmark Advantage
GPT-5.2 Pro
Context Window
Gemini 3 Flash Preview
Speed
Gemini 3 Flash Preview
Pricing Comparison
Price Comparison
| Metric | Gemini 3 Flash Preview | GPT-5.2 Pro | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $0.50 | $21.00 | Gemini 3 Flash Preview |
| Output (per 1M tokens) | $3.00 | $168.00 | Gemini 3 Flash Preview |
| Cache Read (per 1M) | $50000.00 | N/A | Gemini 3 Flash Preview |
| Cache Write (per 1M) | $83300.00 | N/A | Gemini 3 Flash Preview |
Using a 3:1 input/output ratio, Gemini 3 Flash Preview is 98% cheaper overall.
Gemini 3 Flash Preview Providers
Google AI Studio $0.50 (Cheapest)
Google $0.50 (Cheapest)
GPT-5.2 Pro Providers
OpenAI $21.00 (Cheapest)
Benchmark Comparison
6
Benchmarks Compared
1
Gemini 3 Flash Preview Wins
5
GPT-5.2 Pro Wins
Benchmark Scores
| Benchmark | Gemini 3 Flash Preview | GPT-5.2 Pro | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 35.1 | 51.2 | |
Coding Index Code generation & understanding | 37.8 | 48.7 | |
Math Index Mathematical reasoning | 55.7 | 99.0 | |
MMLU Pro Academic knowledge | 88.2 | 87.4 | |
GPQA Graduate-level science | 81.2 | 90.3 | |
LiveCodeBench Competitive programming | 79.7 | 88.9 |
GPT-5.2 Pro significantly outperforms in coding benchmarks.
Cost vs Quality
X-axis:
Y-axis:
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Gemini 3 Flash Preview
Other models
Context & Performance
Context Window
Gemini 3 Flash Preview
1,048,576
tokens
Max output: 65,535 tokens
GPT-5.2 Pro
400,000
tokens
Max output: 128,000 tokens
Gemini 3 Flash Preview has a 62% larger context window.
Speed Performance
| Metric | Gemini 3 Flash Preview | GPT-5.2 Pro | Winner |
|---|---|---|---|
| Tokens/second | 174.5 tok/s | 85.7 tok/s | |
| Time to First Token | 0.93s | 36.70s |
Gemini 3 Flash Preview responds 104% faster on average.
Capabilities
Feature Comparison
| Feature | Gemini 3 Flash Preview | GPT-5.2 Pro |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | Gemini 3 Flash Preview | GPT-5.2 Pro |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | OpenAI | |
| Released | Dec 2025 | Dec 2025 |
Gemini 3 Flash Preview Modalities
Input
textimagefileaudiovideo
Output
text
GPT-5.2 Pro Modalities
Input
imagetextfile
Output
text