# GPT-5.4 mini vs Mercury

> GPT-5.4 mini is the stronger model overall, scoring 45.0 to 37.6 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-4-mini-vs-mercury
- Last updated: 2026-10-10
- Shared benchmarks: 9

## Summary

- They share 9 benchmarks with published results for both. GPT-5.4 mini scores higher in 6 categories and Mercury in 0 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where GPT-5.4 mini leads 64.0 to 46.2.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 37.9% for GPT-5.4 mini and 21.6% for Mercury.

## Snapshot

| | GPT-5.4 mini | Mercury |
|---|---|---|
| Provider | OpenAI | Inception |
| Noometry Index | 45.0 | 37.6 |
| Rank | 76 | 199 |
| Context | 400K | — |
| Input $/M | $0.75 | — |
| Output $/M | $4.50 | — |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.4 mini: 45.2 (#72)
- Mercury: 38.7 (#170)

| Benchmark | GPT-5.4 mini | Mercury |
|---|---|---|
| LMArena Coding | 1438 | 1322 |
| FrontierCode | 27% | — |
| LMArena WebDev | 1397 | — |
| SciCode | 49.9% | — |
| WeirdML | 60.3% | — |
| ALE-Bench | 1,189 | — |

## Agentic & Tool Use

- GPT-5.4 mini: 29.9 (#81)
- Mercury: —

| Benchmark | GPT-5.4 mini | Mercury |
|---|---|---|
| DeepResearch Bench | 36.3% | — |

## Reasoning

- GPT-5.4 mini: 30.4 (#85)
- Mercury: 17.5 (#293)

| Benchmark | GPT-5.4 mini | Mercury |
|---|---|---|
| Kagi LLM Benchmark | 37.9% | 21.6% |
| LMArena Hard Prompts | 1424 | 1285 |
| ARC-AGI-2 | 18.9% | — |
| NYT Connections (extended) | 61.8% | — |
| ARC-AGI-1 | 63.7% | — |
| CritPt | 10% | — |
| Chess Puzzles | 24% | — |
| Thematic Generalization | 61.7% | — |
| Mystery Game Puzzles | 11% | — |
| DTBench | 80% | — |
| LMCA | 40.8% | — |
| Epoch Capabilities Index | 148.84 | — |
| ForecastBench | 57 | — |

## Math

- GPT-5.4 mini: 45.5 (#75)
- Mercury: —

| Benchmark | GPT-5.4 mini | Mercury |
|---|---|---|
| FrontierMath (Tiers 1-3) | 51.2% | — |
| FrontierMath Tier 4 | 9.8% | — |
| OTIS Mock AIME 2024-2025 | 88.9% | — |
| ProofBench | 21% | — |
| LMArena Math | 1419 | — |
| FrontierMath (Feb 2025 set) | 28.3% | — |
| FrontierMath Tier 4 (v1) | 2.1% | — |

## Knowledge

- GPT-5.4 mini: 51.5 (#67)
- Mercury: —

| Benchmark | GPT-5.4 mini | Mercury |
|---|---|---|
| GPQA Diamond | 86.9% | — |
| SimpleQA Verified | 29.4% | — |
| Vectara Hallucination Rate | 5.5% | — |
| LMArena Expert | 1435 | — |

## Multimodal

- GPT-5.4 mini: 39.7 (#56)
- Mercury: —

| Benchmark | GPT-5.4 mini | Mercury |
|---|---|---|
| LMArena Vision | 1245 | — |

## Multilingual

- GPT-5.4 mini: 51.9 (#96)
- Mercury: 41.6 (#206)

| Benchmark | GPT-5.4 mini | Mercury |
|---|---|---|
| LMArena Non-English | 1405 | 1260 |
| LMArena Chinese | 1446 | — |
| LMArena French | 1440 | — |
| LMArena German | 1409 | — |
| LMArena Japanese | 1374 | — |
| LMArena Korean | 1368 | — |
| LMArena Russian | 1417 | — |
| LMArena Spanish | 1405 | — |

## Instruction Following

- GPT-5.4 mini: 74.1 (#102)
- Mercury: 65.2 (#224)

| Benchmark | GPT-5.4 mini | Mercury |
|---|---|---|
| LMArena Instruction Following | 1405 | 1239 |

## Long Context

- GPT-5.4 mini: 43.0 (#112)
- Mercury: 38.4 (#198)

| Benchmark | GPT-5.4 mini | Mercury |
|---|---|---|
| LMArena Longer Query | 1407 | 1266 |

## Writing & Preference

- GPT-5.4 mini: 64.0 (#58)
- Mercury: 46.2 (#221)

| Benchmark | GPT-5.4 mini | Mercury |
|---|---|---|
| LMArena Text | 1412 | 1282 |
| LMArena Creative Writing | 1370 | 1191 |
| LMArena Multi-Turn | 1429 | 1282 |
| EQ-Bench Creative Writing | 1665 | — |

## FAQ

### Is GPT-5.4 mini better than Mercury?

GPT-5.4 mini is the stronger model overall, scoring 45.0 to 37.6 on the Noometry Index.

### Is GPT-5.4 mini or Mercury better for coding?

GPT-5.4 mini scores higher on coding benchmarks: 45.2 versus 38.7 in the Noometry coding category.

### How many benchmarks do GPT-5.4 mini and Mercury share?

9 benchmarks have published results for both models. GPT-5.4 mini has 46 scored results on Noometry and Mercury has 9.