Key Takeaways
GPT-5.1-Codex wins:
- Cheaper input tokens
- Cheaper output tokens
- Faster response time
GPT-5.2 Pro wins:
- Higher intelligence benchmark
- Better at coding
- Better at math
Price Advantage
GPT-5.1-Codex
Benchmark Advantage
GPT-5.2 Pro
Context Window
GPT-5.2 Pro
Speed
GPT-5.1-Codex
Pricing Comparison
Price Comparison
| Metric | GPT-5.1-Codex | GPT-5.2 Pro | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $1.25 | $21.00 | GPT-5.1-Codex |
| Output (per 1M tokens) | $10.00 | $168.00 | GPT-5.1-Codex |
| Cache Read (per 1M) | $125000.00 | N/A | GPT-5.1-Codex |
Using a 3:1 input/output ratio, GPT-5.1-Codex is 94% cheaper overall.
GPT-5.1-Codex Providers
OpenAI $1.25 (Cheapest)
Azure $1.25 (Cheapest)
GPT-5.2 Pro Providers
OpenAI $21.00 (Cheapest)
Benchmark Comparison
6
Benchmarks Compared
0
GPT-5.1-Codex Wins
6
GPT-5.2 Pro Wins
Benchmark Scores
| Benchmark | GPT-5.1-Codex | GPT-5.2 Pro | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 42.2 | 51.2 | |
Coding Index Code generation & understanding | 36.6 | 48.7 | |
Math Index Mathematical reasoning | 95.7 | 99.0 | |
MMLU Pro Academic knowledge | 86.0 | 87.4 | |
GPQA Graduate-level science | 86.0 | 90.3 | |
LiveCodeBench Competitive programming | 84.9 | 88.9 |
GPT-5.2 Pro significantly outperforms in coding benchmarks.
Cost vs Quality
X-axis:
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GPT-5.1-Codex
Other models
Context & Performance
Context Window
GPT-5.1-Codex
400,000
tokens
Max output: 128,000 tokens
GPT-5.2 Pro
400,000
tokens
Max output: 128,000 tokens
Speed Performance
| Metric | GPT-5.1-Codex | GPT-5.2 Pro | Winner |
|---|---|---|---|
| Tokens/second | 166.3 tok/s | 98.3 tok/s | |
| Time to First Token | 15.87s | 46.57s |
GPT-5.1-Codex responds 69% faster on average.
Capabilities
Feature Comparison
| Feature | GPT-5.1-Codex | 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 | GPT-5.1-Codex | GPT-5.2 Pro |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | OpenAI | OpenAI |
| Released | Nov 2025 | Dec 2025 |
GPT-5.1-Codex Modalities
Input
textimage
Output
text
GPT-5.2 Pro Modalities
Input
imagetextfile
Output
text