# Claude Opus 5.5 vs Gemini 1.5 Flash (May 2024)

> Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 33.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-opus-5-5-vs-gemini-1-5-flash
- Last updated: 2026-10-12
- Shared benchmarks: 19

## Summary

- They share 19 benchmarks with published results for both. Claude Opus 5.5 scores higher in 10 categories and Gemini 1.5 Flash (May 2024) in 0 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Opus 5.5 leads 91.8 to 22.1.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 100% for Claude Opus 5.5 and 16.3% for Gemini 1.5 Flash (May 2024).

## Snapshot

| | Claude Opus 5.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| Provider | Anthropic | Google |
| Noometry Index | 68.6 | 33.2 |
| Rank | 3 | 246 |
| Context | 1M | — |
| Input $/M | $4 | — |
| Output $/M | $20 | — |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Opus 5.5: 71.9 (#3)
- Gemini 1.5 Flash (May 2024): 34.4 (#236)

| Benchmark | Claude Opus 5.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| LMArena Coding | 1547 | 1261 |
| FrontierCode | 54.6% | — |
| CursorBench | 57.8% | — |
| LMArena WebDev | 1813 | — |
| FrontierSWE | 62.3% | — |
| SciCode | 66.9% | — |
| WeirdML | — | 24.9% |
| BigCodeBench Instruct | — | 43.5% |
| MirrorCode | 77.4% | — |
| BigCodeBench Complete | — | 55.1% |
| ALE-Bench | 2,147 | — |
| HumanEval+ | — | 75.6% |
| MBPP+ | — | 67.5% |

## Agentic & Tool Use

- Claude Opus 5.5: 45.3 (#15)
- Gemini 1.5 Flash (May 2024): 26.6 (#102)

| Benchmark | Claude Opus 5.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| APEX-Agents | 73.5% | — |
| BALROG | — | 14.6% |
| GDP.pdf | 30.6% | — |
| Vending-Bench 2 | 9,235 | — |

## Reasoning

- Claude Opus 5.5: 80.2 (#3)
- Gemini 1.5 Flash (May 2024): 21.7 (#215)

| Benchmark | Claude Opus 5.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| LMArena Hard Prompts | 1535 | 1257 |
| DTBench | 98.9% | 53.8% |
| Epoch Capabilities Index | 167.33 | 129.36 |
| ARC-AGI-2 | 93.3% | — |
| NYT Connections (extended) | 88.5% | — |
| ARC-AGI-1 | 98.5% | — |
| CritPt | 31.7% | — |
| EBR-Bench | 71.4% | — |
| Mystery Game Puzzles | 71% | — |
| LMCA | 68.2% | — |
| ForecastBench | — | 53.9 |
| PIQA | — | 87.5% |

## Math

- Claude Opus 5.5: 91.8 (#3)
- Gemini 1.5 Flash (May 2024): 22.1 (#281)

| Benchmark | Claude Opus 5.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 100% | 16.3% |
| LMArena Math | 1506 | 1269 |
| FrontierMath (Tiers 1-3) | 91.2% | — |
| FrontierMath Tier 4 | 95% | — |
| ProofBench | 100% | — |
| Omni-MATH | — | 30.4% |
| MATH Level 5 | — | 61.9% |
| FrontierMath (Feb 2025 set) | — | 0% |
| FrontierMath Erdős | 2.9% | — |
| GSM8K | — | 82.4% |

## Knowledge

- Claude Opus 5.5: 66.4 (#10)
- Gemini 1.5 Flash (May 2024): 26.2 (#260)

| Benchmark | Claude Opus 5.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| GPQA Diamond | 90.6% | 47.3% |
| LMArena Expert | 1547 | 1233 |
| SimpleQA Verified | 72.2% | — |
| MMLU-Pro | — | 67.8% |
| GPQA (HELM) | — | 43.7% |
| BoolQ | — | 85.8% |
| MMLU | — | 77.9% |

## Multimodal

- Claude Opus 5.5: 57.8 (#1)
- Gemini 1.5 Flash (May 2024): 36.0 (#81)

| Benchmark | Claude Opus 5.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| LMArena Vision | 1321 | 1141 |
| Video-MME | — | 70.3% |
| GeoBench | — | 76% |
| Blueprint-Bench 2 | 51.2% | — |
| Furniture Assembly | 83.3% | — |

## Multilingual

- Claude Opus 5.5: 59.1 (#2)
- Gemini 1.5 Flash (May 2024): 42.9 (#189)

| Benchmark | Claude Opus 5.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| LMArena Non-English | 1507 | 1278 |
| LMArena Chinese | 1588 | 1295 |
| LMArena French | 1514 | 1258 |
| LMArena Russian | 1520 | 1288 |
| LMArena Spanish | 1507 | 1243 |
| LMArena German | — | 1262 |
| LMArena Japanese | — | 1252 |
| LMArena Korean | — | 1221 |

## Instruction Following

- Claude Opus 5.5: 80.0 (#3)
- Gemini 1.5 Flash (May 2024): 66.8 (#205)

| Benchmark | Claude Opus 5.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| LMArena Instruction Following | 1537 | 1258 |
| IFEval | — | 83.1% |

## Long Context

- Claude Opus 5.5: 47.1 (#19)
- Gemini 1.5 Flash (May 2024): 39.0 (#187)

| Benchmark | Claude Opus 5.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| LMArena Longer Query | 1532 | 1284 |

## Writing & Preference

- Claude Opus 5.5: 78.2 (#3)
- Gemini 1.5 Flash (May 2024): 48.7 (#196)

| Benchmark | Claude Opus 5.5 | Gemini 1.5 Flash (May 2024) |
|---|---|---|
| LMArena Text | 1515 | 1287 |
| LMArena Creative Writing | 1533 | 1285 |
| LMArena Multi-Turn | 1499 | 1253 |
| EQ-Bench Creative Writing | 2050 | — |
| WildBench | — | 79.2% |

## FAQ

### Is Claude Opus 5.5 better than Gemini 1.5 Flash (May 2024)?

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 33.2 on the Noometry Index.

### Is Claude Opus 5.5 or Gemini 1.5 Flash (May 2024) better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.9 versus 34.4 in the Noometry coding category.

### How many benchmarks do Claude Opus 5.5 and Gemini 1.5 Flash (May 2024) share?

19 benchmarks have published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and Gemini 1.5 Flash (May 2024) has 42.