# Claude Sonnet 4.5 vs Gemini 1.5 Flash (May 2024)

> Claude Sonnet 4.5 is the stronger model overall, scoring 44.0 to 32.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-sonnet-4-5-vs-gemini-1-5-flash
- Last updated: 2026-10-10
- Shared benchmarks: 30

## Summary

- They share 30 benchmarks with published results for both. Claude Sonnet 4.5 scores higher in 9 categories and Gemini 1.5 Flash (May 2024) in 1 category; 10 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Claude Sonnet 4.5 leads 48.4 to 26.2.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 77.8% for Claude Sonnet 4.5 and 16.3% for Gemini 1.5 Flash (May 2024).

## Snapshot

| | Claude Sonnet 4.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| Provider | Anthropic | Google |
| Noometry Index | 44.0 | 32.9 |
| Rank | 76 | 240 |
| Context | 1M | — |
| Input $/M | $3 | — |
| Output $/M | $15 | — |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Sonnet 4.5: 47.8 (#54)
- Gemini 1.5 Flash (May 2024): 33.9 (#233)

| Benchmark | Claude Sonnet 4.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| WeirdML | 47.7% | 24.9% |
| LMArena Coding | 1489 | 1262 |
| SWE-bench Verified | 71.3% | — |
| SWE-bench Verified (bash only) | 71.4% | — |
| LMArena WebDev | 1393 | — |
| SWE-bench Multilingual | 67% | — |
| SciCode | 44.7% | — |
| GSO | 14.7% | — |
| BigCodeBench Instruct | — | 43.5% |
| BigCodeBench Complete | — | 55.1% |
| ALE-Bench | 796.15 | — |
| AlgoTune | 1.52 | — |
| HumanEval+ | — | 75.6% |
| MBPP+ | — | 67.5% |

## Agentic & Tool Use

- Claude Sonnet 4.5: 38.1 (#30)
- Gemini 1.5 Flash (May 2024): 26.3 (#97)

| Benchmark | Claude Sonnet 4.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| Terminal-Bench | 46.5% | — |
| Berkeley Function Calling Leaderboard | 73.2% | — |
| GDPval | 42.5% | — |
| Remote Labor Index | 2.1% | — |
| τ²-bench Airline | 72% | — |
| τ²-bench Banking | 25.3% | — |
| τ²-bench Retail | 72.4% | — |
| τ²-bench Telecom | 84.9% | — |
| Cybench | 60% | — |
| DeepResearch Bench | 52.6% | — |
| OSWorld | 62.9% | — |
| BALROG | — | 14.6% |
| LMArena Search | 1159 | — |
| METR Time Horizons | 67.4% | — |
| Vending-Bench 2 | 3,839 | — |

## Reasoning

- Claude Sonnet 4.5: 26.9 (#113)
- Gemini 1.5 Flash (May 2024): 20.8 (#212)

| Benchmark | Claude Sonnet 4.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| LMArena Hard Prompts | 1462 | 1257 |
| DTBench | 83.2% | 53.8% |
| Epoch Capabilities Index | 146.84 | 129.37 |
| ForecastBench | 61.9 | 53.9 |
| ARC-AGI-2 | 13.6% | — |
| SimpleBench | 54.3% | — |
| Kagi LLM Benchmark | 57.9% | — |
| NYT Connections (extended) | 37.3% | — |
| ARC-AGI-1 | 63.7% | — |
| CritPt | 1.1% | — |
| Chess Puzzles | 12% | — |
| EnigmaEval | 6% | — |
| EBR-Bench | 2.4% | — |
| Mystery Game Puzzles | 17% | — |
| LMCA | 38.8% | — |
| PIQA | — | 87.5% |

## Math

- Claude Sonnet 4.5: 31.9 (#190)
- Gemini 1.5 Flash (May 2024): 20.8 (#274)

| Benchmark | Claude Sonnet 4.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 77.8% | 16.3% |
| Omni-MATH | 55.3% | 30.4% |
| LMArena Math | 1448 | 1269 |
| MATH Level 5 | 97.7% | 61.9% |
| FrontierMath (Feb 2025 set) | 15.2% | 0% |
| FrontierMath (Tiers 1-3) | 23.9% | — |
| FrontierMath Tier 4 | 2.4% | — |
| ProofBench | 19% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
| GSM8K | — | 82.4% |

## Knowledge

- Claude Sonnet 4.5: 48.4 (#70)
- Gemini 1.5 Flash (May 2024): 26.2 (#253)

| Benchmark | Claude Sonnet 4.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| GPQA Diamond | 82.3% | 47.3% |
| MMLU-Pro | 86.9% | 67.8% |
| GPQA (HELM) | 68.6% | 43.7% |
| LMArena Expert | 1483 | 1233 |
| Humanity's Last Exam | 13.7% | — |
| SimpleQA Verified | 30.7% | — |
| Vectara Hallucination Rate | 12% | — |
| BoolQ | — | 85.8% |
| MMLU | — | 77.9% |

## Multimodal

- Claude Sonnet 4.5: 34.1 (#84)
- Gemini 1.5 Flash (May 2024): 35.3 (#76)

| Benchmark | Claude Sonnet 4.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| LMArena Vision | — | 1141 |
| Video-MME | — | 70.3% |
| GeoBench | — | 76% |
| VPCT | 39.8% | — |
| LMArena Document | 1450 | — |

## Multilingual

- Claude Sonnet 4.5: 53.6 (#65)
- Gemini 1.5 Flash (May 2024): 43.1 (#184)

| Benchmark | Claude Sonnet 4.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| LMArena Non-English | 1425 | 1278 |
| LMArena Chinese | 1459 | 1295 |
| LMArena French | 1459 | 1257 |
| LMArena German | 1427 | 1262 |
| LMArena Japanese | 1390 | 1252 |
| LMArena Korean | 1403 | 1220 |
| LMArena Russian | 1436 | 1288 |
| LMArena Spanish | 1457 | 1242 |

## Instruction Following

- Claude Sonnet 4.5: 75.2 (#74)
- Gemini 1.5 Flash (May 2024): 67.0 (#199)

| Benchmark | Claude Sonnet 4.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| IFEval | 85% | 83.1% |
| LMArena Instruction Following | 1459 | 1258 |

## Long Context

- Claude Sonnet 4.5: 45.2 (#45)
- Gemini 1.5 Flash (May 2024): 39.0 (#182)

| Benchmark | Claude Sonnet 4.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| LMArena Longer Query | 1476 | 1284 |

## Writing & Preference

- Claude Sonnet 4.5: 66.7 (#33)
- Gemini 1.5 Flash (May 2024): 48.9 (#190)

| Benchmark | Claude Sonnet 4.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| LMArena Text | 1439 | 1287 |
| LMArena Creative Writing | 1442 | 1285 |
| WildBench | 85.4% | 79.2% |
| LMArena Multi-Turn | 1465 | 1253 |
| EQ-Bench Creative Writing | 1678 | — |

## FAQ

### Is Claude Sonnet 4.5 better than Gemini 1.5 Flash (May 2024)?

Claude Sonnet 4.5 is the stronger model overall, scoring 44.0 to 32.9 on the Noometry Index.

### Is Claude Sonnet 4.5 or Gemini 1.5 Flash (May 2024) better for coding?

Claude Sonnet 4.5 scores higher on coding benchmarks: 47.8 versus 33.9 in the Noometry coding category.

### How many benchmarks do Claude Sonnet 4.5 and Gemini 1.5 Flash (May 2024) share?

30 benchmarks have published results for both models. Claude Sonnet 4.5 has 73 scored results on Noometry and Gemini 1.5 Flash (May 2024) has 42.