Model comparison
GPT-5.2 Pro vs Mercury 2.5
GPT-5.2 Pro is the stronger model overall, scoring 52.3 to 33.5 on the Noometry Index. Mercury 2.5 costs 856× less per token, which makes it the better buy when GPT-5.2 Pro's lead doesn't matter for your workload.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in math, where GPT-5.2 Pro leads 65.3 to 23.3.
- Mercury 2.5 is cheaper at $0.04 / $0.15 per million input/output tokens, against $21 / $168 for GPT-5.2 Pro.
- GPT-5.2 Pro accepts more context: 400K tokens versus 260K.
Side by side
| GPT-5.2 Pro | Mercury 2.5 | |
|---|---|---|
| Provider | OpenAI | Inception |
| Noometry Index | 52.3 | 33.5 |
| Released | 2025-12-11 | 2026-09-08 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | 260K |
| Max output | 128K | 66K |
| Input $ / M tokens | $21 | $0.04 |
| Output $ / M tokens | $168 | $0.15 |
| Results tracked | 8 | 4 |
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Category by category
Coding Not comparable
GPT-5.2 Pro: —, Mercury 2.5: 39.5 (#156)
Reasoning GPT-5.2 Pro leads
GPT-5.2 Pro: 51.5 (#33), Mercury 2.5: 22.4 (#193)
| Benchmark | GPT-5.2 Pro | Mercury 2.5 |
|---|---|---|
| ARC-AGI-2 | 54.2% | — |
| SimpleBench | 57.4% | — |
| NYT Connections (extended) | 79.3% | — |
| ARC-AGI-1 | 90.5% | — |
| CritPt | — | 0% |
| Epoch Capabilities Index | 155.4 | — |
Math GPT-5.2 Pro leads
GPT-5.2 Pro: 65.3 (#29), Mercury 2.5: 23.3 (#272)
| Benchmark | GPT-5.2 Pro | Mercury 2.5 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 74% | — |
| FrontierMath Tier 4 | 46% | — |
| ProofBench | — | 3% |
| FrontierMath Tier 4 (v1) | 31.3% | — |
Frequently asked questions
Is GPT-5.2 Pro better than Mercury 2.5?
GPT-5.2 Pro is the stronger model overall, scoring 52.3 to 33.5 on the Noometry Index. Mercury 2.5 costs 856× less per token, which makes it the better buy when GPT-5.2 Pro's lead doesn't matter for your workload.
Which is cheaper, GPT-5.2 Pro or Mercury 2.5?
Mercury 2.5 is cheaper. It lists at $0.04 per million input tokens and $0.15 per million output tokens; GPT-5.2 Pro lists at $21 and $168.
Which has the bigger context window?
GPT-5.2 Pro does, with 400K tokens against 260K.
How many benchmarks do GPT-5.2 Pro and Mercury 2.5 share?
0 benchmarks have published results for both models. GPT-5.2 Pro has 8 scored results on Noometry and Mercury 2.5 has 4.