Key Takeaways
GPT-5.2 Pro wins:
- Higher intelligence benchmark
- Better at coding
- Better at math
Grok 4 Fast wins:
- Cheaper input tokens
- Cheaper output tokens
- Larger context window
- Faster response time
Price Advantage
Grok 4 Fast
Benchmark Advantage
GPT-5.2 Pro
Context Window
Grok 4 Fast
Speed
Grok 4 Fast
Pricing Comparison
Price Comparison
| Metric | GPT-5.2 Pro | Grok 4 Fast | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $21.00 | $0.20 | Grok 4 Fast |
| Output (per 1M tokens) | $168.00 | $0.50 | Grok 4 Fast |
| Cache Read (per 1M) | N/A | $50000.00 | Grok 4 Fast |
Using a 3:1 input/output ratio, Grok 4 Fast is 100% cheaper overall.
GPT-5.2 Pro Providers
OpenAI $21.00 (Cheapest)
Grok 4 Fast Providers
xAI $0.20 (Cheapest)
Benchmark Comparison
6
Benchmarks Compared
6
GPT-5.2 Pro Wins
0
Grok 4 Fast Wins
Benchmark Scores
| Benchmark | GPT-5.2 Pro | Grok 4 Fast | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 51.2 | 22.6 | |
Coding Index Code generation & understanding | 48.7 | 19.0 | |
Math Index Mathematical reasoning | 99.0 | 41.3 | |
MMLU Pro Academic knowledge | 87.4 | 73.0 | |
GPQA Graduate-level science | 90.3 | 60.6 | |
LiveCodeBench Competitive programming | 88.9 | 40.1 |
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
Grok 4 Fast
2,000,000
tokens
Max output: 30,000 tokens
Grok 4 Fast has a 80% larger context window.
Speed Performance
| Metric | GPT-5.2 Pro | Grok 4 Fast | Winner |
|---|---|---|---|
| Tokens/second | 93.4 tok/s | 172.3 tok/s | |
| Time to First Token | 30.81s | 0.60s |
Grok 4 Fast responds 84% faster on average.
Capabilities
Feature Comparison
| Feature | GPT-5.2 Pro | Grok 4 Fast |
|---|---|---|
| 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 | Grok 4 Fast |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | OpenAI | Xai |
| Released | Dec 2025 | Sep 2025 |
GPT-5.2 Pro Modalities
Input
imagetextfile
Output
text
Grok 4 Fast Modalities
Input
textimage
Output
text