# GPT-5.2 vs Mercury 2.5

> Side-by-side benchmark comparison for GPT-5.2 and Mercury 2.5 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-2-vs-mercury-2-5
- Last updated: September 8, 2026

- Shared sourced benchmarks: 0
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

No benchmark verdict yet: there is no shared sourced benchmark row for GPT-5.2 and Mercury 2.5.

## Summary

- GPT-5.2 and Mercury 2.5 do not currently share a sourced benchmark row. The mirror therefore compares metadata, pricing, context windows, and each model's separately reported coverage without naming a benchmark winner.

## Model Snapshot

| Property | GPT-5.2 | Mercury 2.5 |
|----------|----------|----------|
| Creator | OpenAI | Inception |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 400K | 260K |
| Independent public score (not head-to-head) | 64.87 | null |
| Benchmarks Covered | 15 | 5 |
| Pricing (input/output) | $1.75 / $14.00 | $0.04 / $0.15 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-5.2 public-lane score: 42.9 (Supported · #106/152)
- Mercury 2.5 public-lane score: 44.5 (Estimated · #91/152)

| Benchmark | GPT-5.2 | Mercury 2.5 | Winner |
|-----------|-----------|-----------|--------|
| BrowseComp | 65.8% | Coming soon | Coming soon |
| OSWorld-Verified | 47.3% | Coming soon | Coming soon |
| Gert Labs | 46.54% | Coming soon | Coming soon |
| JobBench | 34.3% | Coming soon | Coming soon |
| τ³-bench results | Coming soon | 96.0% | Coming soon |
| DeepSearchQA | Coming soon | 34.0% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-5.2 public-lane score: 46.5 (Supported · #83/151)
- Mercury 2.5 public-lane score: 47.8 (Estimated · #73/151)

| Benchmark | GPT-5.2 | Mercury 2.5 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 80% | Coming soon | Coming soon |
| SWE-bench Pro | 55.6% | Coming soon | Coming soon |
| Vibe Code Bench | 53.50% | Coming soon | Coming soon |
| SciCode | Coming soon | 38% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-5.2 public-lane score: 66.3 (#23/48)
- Mercury 2.5 public-lane score: Coming soon

| Benchmark | GPT-5.2 | Mercury 2.5 | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 79.5% | Coming soon | Coming soon |
| MathVision | 83.0% | Coming soon | Coming soon |
| CharXiv | 82.1% | Coming soon | Coming soon |
| V* | 75.9% | Coming soon | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- GPT-5.2 public-lane score: 53.7 (Unranked · 3 rankable rows)
- Mercury 2.5 public-lane score: 67.7 (Unranked · 1 rankable row)

| Benchmark | GPT-5.2 | Mercury 2.5 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 52.9% | Coming soon | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- GPT-5.2 public-lane score: 61.8 (Supported · #30/182)
- Mercury 2.5 public-lane score: 48.3 (Estimated · #94/182)

| Benchmark | GPT-5.2 | Mercury 2.5 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 92.4% | Coming soon | Coming soon |
| GPQA-D | Coming soon | 79.0% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-5.2 public-lane score: 92.6 (#14/121)
- Mercury 2.5 public-lane score: 80.1 (#53/121)

| Benchmark | GPT-5.2 | Mercury 2.5 | Winner |
|-----------|-----------|-----------|--------|
| IFBench | Coming soon | 77% | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- GPT-5.2 public-lane score: 57.5 (Unranked · 2 rankable rows)
- Mercury 2.5 public-lane score: Coming soon

| Benchmark | GPT-5.2 | Mercury 2.5 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 40.700% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 18.800% | Coming soon | Coming soon |

## FAQ

### Can I compare GPT-5.2 and Mercury 2.5 on BenchLM yet?

Not fully yet. BenchLM is tracking both models, but sourced benchmark coverage is still incomplete for a fair score-level comparison.

### Why does this page show "coming soon" values?

BenchLM only calls winners when public benchmark coverage is available on both sides of the comparison.

## Related Comparisons

- [GPT-5.2 vs GPT-5.2 Pro](/compare/gpt-5-2-vs-gpt-5-2-pro)
- [Mercury 2.5 vs GPT-5.2 Pro](/compare/gpt-5-2-pro-vs-mercury-2-5)
- [GPT-5.2 vs GPT-5.2 Instant](/compare/gpt-5-2-vs-gpt-5-2-instant)
- [Mercury 2.5 vs GPT-5.2 Instant](/compare/gpt-5-2-instant-vs-mercury-2-5)

## Explore More

- [GPT-5.2 profile](/models/gpt-5-2)
- [Mercury 2.5 profile](/models/mercury-2-5)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)