Key Takeaways
GPT-5.2 Pro wins:
- Larger context window
- Faster response time
- Higher intelligence benchmark
- Better at coding
- Better at math
Step3 wins:
- Cheaper input tokens
- Cheaper output tokens
Price Advantage
Step3
Benchmark Advantage
GPT-5.2 Pro
Context Window
GPT-5.2 Pro
Speed
GPT-5.2 Pro
Pricing Comparison
Price Comparison
| Metric | GPT-5.2 Pro | Step3 | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $21.00 | $0.57 | Step3 |
| Output (per 1M tokens) | $168.00 | $1.42 | Step3 |
Using a 3:1 input/output ratio, Step3 is 99% cheaper overall.
GPT-5.2 Pro Providers
OpenAI $21.00 (Cheapest)
Step3 Providers
SiliconFlow $0.57 (Cheapest)
Benchmark Comparison
6
Benchmarks Compared
0
GPT-5.2 Pro Wins
0
Step3 Wins
Benchmark Scores
| Benchmark | GPT-5.2 Pro | Step3 | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 51.2 | - | - |
Coding Index Code generation & understanding | 48.7 | - | - |
Math Index Mathematical reasoning | 99.0 | - | - |
MMLU Pro Academic knowledge | 87.4 | - | - |
GPQA Graduate-level science | 90.3 | - | - |
LiveCodeBench Competitive programming | 88.9 | - | - |
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
Step3
65,536
tokens
Max output: 65,536 tokens
GPT-5.2 Pro has a 84% larger context window.
Speed Performance
| Metric | GPT-5.2 Pro | Step3 | Winner |
|---|---|---|---|
| Tokens/second | 99.7 tok/s | N/A | |
| Time to First Token | 27.00s | N/A |
Capabilities
Feature Comparison
| Feature | GPT-5.2 Pro | Step3 |
|---|---|---|
| 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 | Step3 |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | OpenAI | Stepfun-ai |
| Released | Dec 2025 | Aug 2025 |
GPT-5.2 Pro Modalities
Input
imagetextfile
Output
text
Step3 Modalities
Input
imagetext
Output
text