Key Takeaways
Mercury 2 wins:
- Cheaper input tokens
- Cheaper output tokens
- Faster response time
GPT-5.2 Pro wins:
- Larger context window
- Higher intelligence benchmark
- Better at coding
- Better at math
- Supports vision
- Supports tool calls
Price Advantage
Mercury 2
Benchmark Advantage
GPT-5.2 Pro
Context Window
GPT-5.2 Pro
Speed
Mercury 2
Pricing Comparison
Price Comparison
| Metric | Mercury 2 | GPT-5.2 Pro | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $0.25 | $10.50 | Mercury 2 |
| Output (per 1M tokens) | $0.75 | $84.00 | Mercury 2 |
| Cache Read (per 1M) | $0.03 | N/A | Mercury 2 |
Using a 3:1 input/output ratio, Mercury 2 is 99% cheaper overall.
Mercury 2 Providers
No provider data available
GPT-5.2 Pro Providers
No provider data available
Benchmark Comparison
6
Benchmarks Compared
0
Mercury 2 Wins
3
GPT-5.2 Pro Wins
Benchmark Scores
| Benchmark | Mercury 2 | GPT-5.2 Pro | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 32.8 | 51.3 | |
Coding Index Code generation & understanding | 30.6 | 48.7 | |
Math Index Mathematical reasoning | - | 99.0 | - |
MMLU Pro Academic knowledge | - | 87.4 | - |
GPQA Graduate-level science | 77.0 | 90.3 | |
LiveCodeBench Competitive programming | - | 88.9 | - |
GPT-5.2 Pro significantly outperforms in coding benchmarks.
Cost vs Quality
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Other models
Context & Performance
Context Window
Mercury 2
128,000
tokens
GPT-5.2 Pro
400,000
tokens
GPT-5.2 Pro has a 68% larger context window.
Speed Performance
| Metric | Mercury 2 | GPT-5.2 Pro | Winner |
|---|---|---|---|
| Tokens/second | 794.9 tok/s | 72.0 tok/s | |
| Time to First Token | 3.59s | 119.13s |
Mercury 2 responds 1004% faster on average.
Capabilities
Feature Comparison
| Feature | Mercury 2 | 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 | Mercury 2 | GPT-5.2 Pro |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | Inception | OpenAI |
| Released | Mar 2026 | Dec 2025 |
Mercury 2 Modalities
Input
text
Output
text
GPT-5.2 Pro Modalities
Input
imagetextfile
Output
text