Key Takeaways
GPT-5.2 Pro wins:
- Larger context window
- Higher intelligence benchmark
- Better at coding
- Better at math
- Supports vision
o3 Mini wins:
- Cheaper input tokens
- Cheaper output tokens
- Faster response time
- Has reasoning mode
Price Advantage
o3 Mini
Benchmark Advantage
GPT-5.2 Pro
Context Window
GPT-5.2 Pro
Speed
o3 Mini
Pricing Comparison
Price Comparison
| Metric | GPT-5.2 Pro | o3 Mini | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $21.00 | $1.10 | o3 Mini |
| Output (per 1M tokens) | $168.00 | $4.40 | o3 Mini |
| Cache Read (per 1M) | N/A | $550000.00 | o3 Mini |
Using a 3:1 input/output ratio, o3 Mini is 97% cheaper overall.
GPT-5.2 Pro Providers
OpenAI $21.00 (Cheapest)
o3 Mini Providers
OpenAI $1.10 (Cheapest)
Vercel $1.10 (Cheapest)
Azure $1.10 (Cheapest)
Benchmark Comparison
8
Benchmarks Compared
5
GPT-5.2 Pro Wins
0
o3 Mini Wins
Benchmark Scores
| Benchmark | GPT-5.2 Pro | o3 Mini | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 51.2 | 25.9 | |
Coding Index Code generation & understanding | 48.7 | 17.9 | |
Math Index Mathematical reasoning | 99.0 | - | - |
MMLU Pro Academic knowledge | 87.4 | 79.1 | |
GPQA Graduate-level science | 90.3 | 74.8 | |
LiveCodeBench Competitive programming | 88.9 | 71.7 | |
Aider Real-world code editing | - | 60.4 | - |
AIME Competition math | - | 77.0 | - |
GPT-5.2 Pro significantly outperforms in coding benchmarks.
Cost vs Quality
X-axis:
Y-axis:
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GPT-5.2 Pro
Other models
Context & Performance
Context Window
GPT-5.2 Pro
400,000
tokens
Max output: 128,000 tokens
o3 Mini
200,000
tokens
Max output: 100,000 tokens
GPT-5.2 Pro has a 50% larger context window.
Speed Performance
| Metric | GPT-5.2 Pro | o3 Mini | Winner |
|---|---|---|---|
| Tokens/second | 98.3 tok/s | 135.2 tok/s | |
| Time to First Token | 46.57s | 17.00s |
o3 Mini responds 37% faster on average.
Capabilities
Feature Comparison
| Feature | GPT-5.2 Pro | o3 Mini |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | GPT-5.2 Pro | o3 Mini |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | OpenAI | OpenAI |
| Released | Dec 2025 | Jan 2025 |
GPT-5.2 Pro Modalities
Input
imagetextfile
Output
text
o3 Mini Modalities
Input
textfile
Output
text