# GPT-5.4 mini vs Step 3

> GPT-5.4 mini is the stronger model overall, scoring 44.8 to 39.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-4-mini-vs-step-3
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. GPT-5.4 mini scores higher in 9 categories and Step 3 in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where GPT-5.4 mini leads 51.4 to 36.2.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 37.9% for GPT-5.4 mini and 62.3% for Step 3.
- Step 3 has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.4 mini | Step 3 |
|---|---|---|
| Provider | OpenAI | StepFun |
| Noometry Index | 44.8 | 39.9 |
| Rank | 69 | 145 |
| Context | 400K | — |
| Input $/M | $0.75 | — |
| Output $/M | $4.50 | — |
| Weights | Proprietary | Open |

## Coding

- GPT-5.4 mini: 45.0 (#67)
- Step 3: 39.5 (#144)

| Benchmark | GPT-5.4 mini | Step 3 |
|---|---|---|
| LMArena Coding | 1438 | 1367 |
| FrontierCode | 27% | — |
| LMArena WebDev | 1397 | — |
| SciCode | 49.9% | — |
| WeirdML | 60.3% | — |
| ALE-Bench | 1,189 | — |

## Agentic & Tool Use

- GPT-5.4 mini: 29.6 (#74)
- Step 3: —

| Benchmark | GPT-5.4 mini | Step 3 |
|---|---|---|
| DeepResearch Bench | 36.3% | — |

## Reasoning

- GPT-5.4 mini: 30.3 (#77)
- Step 3: 27.6 (#102)

| Benchmark | GPT-5.4 mini | Step 3 |
|---|---|---|
| Kagi LLM Benchmark | 37.9% | 62.3% |
| LMArena Hard Prompts | 1424 | 1355 |
| 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 | 148.83 | — |
| ForecastBench | 57 | — |

## Math

- GPT-5.4 mini: 45.4 (#63)
- Step 3: 34.9 (#148)

| Benchmark | GPT-5.4 mini | Step 3 |
|---|---|---|
| LMArena Math | 1418 | 1366 |
| FrontierMath (Tiers 1-3) | 51.2% | — |
| FrontierMath Tier 4 | 9.8% | — |
| OTIS Mock AIME 2024-2025 | 88.9% | — |
| ProofBench | 21% | — |
| FrontierMath (Feb 2025 set) | 28.3% | — |
| FrontierMath Tier 4 (v1) | 2.1% | — |

## Knowledge

- GPT-5.4 mini: 51.4 (#62)
- Step 3: 36.2 (#161)

| Benchmark | GPT-5.4 mini | Step 3 |
|---|---|---|
| LMArena Expert | 1434 | 1333 |
| GPQA Diamond | 86.9% | — |
| SimpleQA Verified | 29.4% | — |
| Vectara Hallucination Rate | 5.5% | — |

## Multimodal

- GPT-5.4 mini: 39.0 (#51)
- Step 3: 34.9 (#81)

| Benchmark | GPT-5.4 mini | Step 3 |
|---|---|---|
| LMArena Vision | 1245 | 1176 |

## Multilingual

- GPT-5.4 mini: 52.1 (#94)
- Step 3: 46.5 (#154)

| Benchmark | GPT-5.4 mini | Step 3 |
|---|---|---|
| LMArena Non-English | 1405 | 1327 |
| LMArena Chinese | 1446 | 1396 |
| LMArena German | 1407 | 1371 |
| LMArena Korean | 1369 | 1271 |
| LMArena Russian | 1417 | 1331 |
| LMArena Spanish | 1403 | 1372 |
| LMArena French | 1440 | — |
| LMArena Japanese | 1375 | — |

## Instruction Following

- GPT-5.4 mini: 74.3 (#99)
- Step 3: 70.6 (#159)

| Benchmark | GPT-5.4 mini | Step 3 |
|---|---|---|
| LMArena Instruction Following | 1405 | 1332 |

## Long Context

- GPT-5.4 mini: 42.9 (#107)
- Step 3: 40.3 (#152)

| Benchmark | GPT-5.4 mini | Step 3 |
|---|---|---|
| LMArena Longer Query | 1407 | 1326 |

## Writing & Preference

- GPT-5.4 mini: 64.2 (#56)
- Step 3: 54.5 (#146)

| Benchmark | GPT-5.4 mini | Step 3 |
|---|---|---|
| LMArena Text | 1411 | 1351 |
| LMArena Creative Writing | 1370 | 1322 |
| LMArena Multi-Turn | 1429 | 1340 |
| EQ-Bench Creative Writing | 1665 | — |

## FAQ

### Is GPT-5.4 mini better than Step 3?

GPT-5.4 mini is the stronger model overall, scoring 44.8 to 39.9 on the Noometry Index.

### Is GPT-5.4 mini or Step 3 better for coding?

GPT-5.4 mini scores higher on coding benchmarks: 45.0 versus 39.5 in the Noometry coding category.

### How many benchmarks do GPT-5.4 mini and Step 3 share?

17 benchmarks have published results for both models. GPT-5.4 mini has 46 scored results on Noometry and Step 3 has 17.