# Gemini 3 Deep Think vs GPT-4.5

> GPT-4.5 has enough public results to be ranked (#200); Gemini 3 Deep Think does not yet, so treat this comparison as directional.

- Canonical page: https://noometry.com/compare/gemini-3-deep-think-vs-gpt-4-5
- Last updated: 2026-10-10
- Shared benchmarks: 2

## Summary

- They share 2 benchmarks with published results for both. Gemini 3 Deep Think scores higher in 1 category and GPT-4.5 in 0 categories; one gap is clear of the uncertainty.
- The widest gap is in reasoning, where Gemini 3 Deep Think leads 70.8 to 14.1.
- The biggest single-benchmark swing is ARC-AGI-1: 96% for Gemini 3 Deep Think and 10.3% for GPT-4.5.

## Snapshot

| | Gemini 3 Deep Think | GPT-4.5 |
|---|---|---|
| Provider | Google | OpenAI |
| Noometry Index | 58.5 | 36.9 |
| Rank | — | 200 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 3 Deep Think: —
- GPT-4.5: 41.8 (#102)

| Benchmark | Gemini 3 Deep Think | GPT-4.5 |
|---|---|---|
| Aider Polyglot | — | 44.9% |
| WeirdML | — | 39.4% |
| LiveBench Coding | — | 75.2% |
| LMArena Coding | — | 1397 |

## Agentic & Tool Use

- Gemini 3 Deep Think: —
- GPT-4.5: 27.6 (#92)

| Benchmark | Gemini 3 Deep Think | GPT-4.5 |
|---|---|---|
| Cybench | — | 17.5% |

## Reasoning

- Gemini 3 Deep Think: 70.8 (#11)
- GPT-4.5: 14.1 (#320)

| Benchmark | Gemini 3 Deep Think | GPT-4.5 |
|---|---|---|
| ARC-AGI-2 | 84.6% | 0.8% |
| ARC-AGI-1 | 96% | 10.3% |
| SimpleBench | — | 34.5% |
| CritPt | 25.7% | — |
| EnigmaEval | — | 3.2% |
| LiveBench Reasoning | — | 71.1% |
| LMArena Hard Prompts | — | 1404 |
| LiveBench Data Analysis | — | 64.3% |
| Epoch Capabilities Index | — | 136.74 |
| ForecastBench | — | 61.7 |
| LiveBench | — | 69% |

## Math

- Gemini 3 Deep Think: —
- GPT-4.5: 31.0 (#200)

| Benchmark | Gemini 3 Deep Think | GPT-4.5 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 37.8% |
| LiveBench Math | — | 69.3% |
| LMArena Math | — | 1412 |
| MATH Level 5 | — | 78.6% |

## Knowledge

- Gemini 3 Deep Think: —
- GPT-4.5: 32.4 (#205)

| Benchmark | Gemini 3 Deep Think | GPT-4.5 |
|---|---|---|
| GPQA Diamond | — | 68.7% |
| Humanity's Last Exam | — | 5.4% |
| Confabulations | — | 13.6% |
| LMArena Expert | — | 1394 |

## Multimodal

- Gemini 3 Deep Think: —
- GPT-4.5: 37.0 (#68)

| Benchmark | Gemini 3 Deep Think | GPT-4.5 |
|---|---|---|
| LMArena Vision | — | 1195 |
| VPCT | — | 45% |

## Multilingual

- Gemini 3 Deep Think: —
- GPT-4.5: 52.7 (#78)

| Benchmark | Gemini 3 Deep Think | GPT-4.5 |
|---|---|---|
| LMArena Non-English | — | 1413 |
| LMArena Chinese | — | 1421 |
| LMArena French | — | 1417 |
| LMArena German | — | 1457 |
| LMArena Japanese | — | 1416 |
| LMArena Korean | — | 1392 |
| LMArena Russian | — | 1419 |

## Instruction Following

- Gemini 3 Deep Think: —
- GPT-4.5: 72.8 (#129)

| Benchmark | Gemini 3 Deep Think | GPT-4.5 |
|---|---|---|
| LiveBench Instruction Following | — | 72.3% |
| LMArena Instruction Following | — | 1404 |

## Long Context

- Gemini 3 Deep Think: —
- GPT-4.5: 40.4 (#150)

| Benchmark | Gemini 3 Deep Think | GPT-4.5 |
|---|---|---|
| Fiction.LiveBench | — | 63.9% |
| LMArena Longer Query | — | 1406 |

## Writing & Preference

- Gemini 3 Deep Think: —
- GPT-4.5: 57.1 (#129)

| Benchmark | Gemini 3 Deep Think | GPT-4.5 |
|---|---|---|
| LMArena Text | — | 1417 |
| LMArena Creative Writing | — | 1394 |
| Short-Story Creative Writing | — | 75.6% |
| EQ-Bench Creative Writing | — | 1258 |
| LMArena Multi-Turn | — | 1444 |
| LiveBench Language | — | 61.5% |

## FAQ

### Is Gemini 3 Deep Think better than GPT-4.5?

GPT-4.5 has enough public results to be ranked (#200); Gemini 3 Deep Think does not yet, so treat this comparison as directional.

### How many benchmarks do Gemini 3 Deep Think and GPT-4.5 share?

2 benchmarks have published results for both models. Gemini 3 Deep Think has 3 scored results on Noometry and GPT-4.5 has 42.