# GPT-5.2 Pro vs Mercury 2.5

> GPT-5.2 Pro has enough public results to be ranked (#34); Mercury 2.5 does not yet, so treat this comparison as directional.

- Canonical page: https://noometry.com/compare/gpt-5-2-pro-vs-mercury-2-5
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in math, where GPT-5.2 Pro leads 64.8 to 22.4.
- 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.

## Snapshot

| | GPT-5.2 Pro | Mercury 2.5 |
|---|---|---|
| Provider | OpenAI | Inception |
| Noometry Index | 52.2 | 30.2 |
| Rank | 34 | — |
| Context | 400K | 260K |
| Input $/M | $21 | $0.04 |
| Output $/M | $168 | $0.15 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.2 Pro: —
- Mercury 2.5: —

| Benchmark | GPT-5.2 Pro | Mercury 2.5 |
|---|---|---|
| ALE-Bench | — | 301.65 |

## Reasoning

- GPT-5.2 Pro: 51.8 (#31)
- Mercury 2.5: —

| 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% | — |
| Epoch Capabilities Index | 155.41 | — |

## Math

- GPT-5.2 Pro: 64.8 (#23)
- Mercury 2.5: 22.4

| 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% | — |

## FAQ

### Is GPT-5.2 Pro better than Mercury 2.5?

GPT-5.2 Pro has enough public results to be ranked (#34); Mercury 2.5 does not yet, so treat this comparison as directional.

### 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 2.