Key Takeaways
GPT-5.2 Pro wins:
- Larger context window
- Higher intelligence benchmark
- Better at coding
- Better at math
o3 wins:
- Cheaper input tokens
- Cheaper output tokens
- Faster response time
- Has reasoning mode
Price Advantage
o3
Benchmark Advantage
GPT-5.2 Pro
Context Window
GPT-5.2 Pro
Speed
o3
Pricing Comparison
Price Comparison
| Metric | GPT-5.2 Pro | o3 | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $21.00 | $2.00 | o3 |
| Output (per 1M tokens) | $168.00 | $8.00 | o3 |
| Cache Read (per 1M) | N/A | $500000.00 | o3 |
Using a 3:1 input/output ratio, o3 is 94% cheaper overall.
GPT-5.2 Pro Providers
OpenAI $21.00 (Cheapest)
o3 Providers
OpenAI $2.00 (Cheapest)
Vercel $2.00 (Cheapest)
Benchmark Comparison
8
Benchmarks Compared
6
GPT-5.2 Pro Wins
0
o3 Wins
Benchmark Scores
| Benchmark | GPT-5.2 Pro | o3 | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 51.2 | 38.3 | |
Coding Index Code generation & understanding | 48.7 | 38.4 | |
Math Index Mathematical reasoning | 99.0 | 88.3 | |
MMLU Pro Academic knowledge | 87.4 | 85.3 | |
GPQA Graduate-level science | 90.3 | 82.7 | |
LiveCodeBench Competitive programming | 88.9 | 80.8 | |
Aider Real-world code editing | - | 81.3 | - |
AIME Competition math | - | 90.3 | - |
GPT-5.2 Pro significantly outperforms in coding benchmarks.
Cost vs Quality
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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
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 | Winner |
|---|---|---|---|
| Tokens/second | 98.3 tok/s | 109.7 tok/s | |
| Time to First Token | 46.57s | 20.34s |
o3 responds 12% faster on average.
Capabilities
Feature Comparison
| Feature | GPT-5.2 Pro | o3 |
|---|---|---|
| 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 |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | OpenAI | OpenAI |
| Released | Dec 2025 | Apr 2025 |
GPT-5.2 Pro Modalities
Input
imagetextfile
Output
text
o3 Modalities
Input
imagetextfile
Output
text