# GPT-4.5 vs GPT-5 Mini

> GPT-5 Mini is the stronger model overall, scoring 41.7 to 36.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-4-5-vs-gpt-5-mini
- Last updated: 2026-10-10
- Shared benchmarks: 32

## Summary

- They share 32 benchmarks with published results for both. GPT-4.5 scores higher in 4 categories and GPT-5 Mini in 6 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5 Mini leads 46.3 to 31.0.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 37.8% for GPT-4.5 and 86.7% for GPT-5 Mini.

## Snapshot

| | GPT-4.5 | GPT-5 Mini |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 36.9 | 41.7 |
| Rank | 200 | 115 |
| Context | — | 400K |
| Input $/M | — | $0.25 |
| Output $/M | — | $2 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-4.5: 41.8 (#102)
- GPT-5 Mini: 40.0 (#134)

| Benchmark | GPT-4.5 | GPT-5 Mini |
|---|---|---|
| WeirdML | 39.4% | 52.7% |
| LMArena Coding | 1397 | 1406 |
| SWE-bench Verified | — | 64.7% |
| SWE-bench Verified (bash only) | — | 59.8% |
| Aider Polyglot | 44.9% | — |
| SWE-bench Multilingual | — | 39.7% |
| SciCode | — | 39.2% |
| LiveBench Coding | 75.2% | — |
| ALE-Bench | — | 799.77 |
| AlgoTune | — | 1.38 |

## Agentic & Tool Use

- GPT-4.5: 27.6 (#92)
- GPT-5 Mini: 31.0 (#64)

| Benchmark | GPT-4.5 | GPT-5 Mini |
|---|---|---|
| Terminal-Bench | — | 34.8% |
| Berkeley Function Calling Leaderboard | — | 55.5% |
| Cybench | 17.5% | — |
| Vending-Bench 2 | — | -31.18 |

## Reasoning

- GPT-4.5: 14.1 (#320)
- GPT-5 Mini: 24.1 (#153)

| Benchmark | GPT-4.5 | GPT-5 Mini |
|---|---|---|
| ARC-AGI-2 | 0.8% | 4.4% |
| ARC-AGI-1 | 10.3% | 54.3% |
| EnigmaEval | 3.2% | 8.2% |
| LMArena Hard Prompts | 1404 | 1380 |
| Epoch Capabilities Index | 136.74 | 145.51 |
| ForecastBench | 61.7 | 61 |
| SimpleBench | 34.5% | — |
| Kagi LLM Benchmark | — | 70.3% |
| CritPt | — | 0% |
| Chess Puzzles | — | 30% |
| LiveBench Reasoning | 71.1% | — |
| Mystery Game Puzzles | — | 10% |
| DTBench | — | 80.5% |
| LiveBench Data Analysis | 64.3% | — |
| LMCA | — | 34.2% |
| LiveBench | 69% | — |

## Math

- GPT-4.5: 31.0 (#200)
- GPT-5 Mini: 46.3 (#59)

| Benchmark | GPT-4.5 | GPT-5 Mini |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 37.8% | 86.7% |
| LMArena Math | 1412 | 1377 |
| MATH Level 5 | 78.6% | 97.8% |
| FrontierMath (Tiers 1-3) | — | 46.7% |
| FrontierMath Tier 4 | — | 12.2% |
| ProofBench | — | 9% |
| Omni-MATH | — | 72.2% |
| LiveBench Math | 69.3% | — |
| FrontierMath (Feb 2025 set) | — | 27.2% |
| FrontierMath Tier 4 (v1) | — | 6.3% |

## Knowledge

- GPT-4.5: 32.4 (#205)
- GPT-5 Mini: 45.5 (#80)

| Benchmark | GPT-4.5 | GPT-5 Mini |
|---|---|---|
| GPQA Diamond | 68.7% | 75% |
| Humanity's Last Exam | 5.4% | 19.4% |
| Confabulations | 13.6% | 13.3% |
| LMArena Expert | 1394 | 1377 |
| SimpleQA Verified | — | 21.6% |
| MMLU-Pro | — | 83.5% |
| Vectara Hallucination Rate | — | 12.9% |
| GPQA (HELM) | — | 75.6% |

## Multimodal

- GPT-4.5: 37.0 (#68)
- GPT-5 Mini: 35.0 (#80)

| Benchmark | GPT-4.5 | GPT-5 Mini |
|---|---|---|
| LMArena Vision | 1195 | 1202 |
| VPCT | 45% | 40.2% |

## Multilingual

- GPT-4.5: 52.7 (#78)
- GPT-5 Mini: 49.1 (#131)

| Benchmark | GPT-4.5 | GPT-5 Mini |
|---|---|---|
| LMArena Non-English | 1413 | 1363 |
| LMArena Chinese | 1421 | 1387 |
| LMArena French | 1417 | 1385 |
| LMArena German | 1457 | 1366 |
| LMArena Japanese | 1416 | 1342 |
| LMArena Korean | 1392 | 1306 |
| LMArena Russian | 1419 | 1362 |
| LMArena Spanish | — | 1355 |

## Instruction Following

- GPT-4.5: 72.8 (#129)
- GPT-5 Mini: 76.4 (#43)

| Benchmark | GPT-4.5 | GPT-5 Mini |
|---|---|---|
| LMArena Instruction Following | 1404 | 1357 |
| LiveBench Instruction Following | 72.3% | — |
| IFEval | — | 92.7% |

## Long Context

- GPT-4.5: 40.4 (#150)
- GPT-5 Mini: 41.9 (#127)

| Benchmark | GPT-4.5 | GPT-5 Mini |
|---|---|---|
| Fiction.LiveBench | 63.9% | 69.4% |
| LMArena Longer Query | 1406 | 1355 |

## Writing & Preference

- GPT-4.5: 57.1 (#129)
- GPT-5 Mini: 55.4 (#143)

| Benchmark | GPT-4.5 | GPT-5 Mini |
|---|---|---|
| LMArena Text | 1417 | 1373 |
| LMArena Creative Writing | 1394 | 1325 |
| Short-Story Creative Writing | 75.6% | 83.1% |
| EQ-Bench Creative Writing | 1258 | 1313 |
| LMArena Multi-Turn | 1444 | 1363 |
| WildBench | — | 85.5% |
| LiveBench Language | 61.5% | — |

## FAQ

### Is GPT-4.5 better than GPT-5 Mini?

GPT-5 Mini is the stronger model overall, scoring 41.7 to 36.9 on the Noometry Index.

### Is GPT-4.5 or GPT-5 Mini better for coding?

GPT-4.5 scores higher on coding benchmarks: 41.8 versus 40.0 in the Noometry coding category.

### How many benchmarks do GPT-4.5 and GPT-5 Mini share?

32 benchmarks have published results for both models. GPT-4.5 has 42 scored results on Noometry and GPT-5 Mini has 60.