# Claude Opus 5 vs Gemini 1.5 Flash 8B

> Claude Opus 5 is the stronger model overall, scoring 67.7 to 29.7 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-opus-5-vs-gemini-1-5-flash-8b
- Last updated: 2026-10-10
- Shared benchmarks: 21

## Summary

- They share 21 benchmarks with published results for both. Claude Opus 5 scores higher in 9 categories and Gemini 1.5 Flash 8B in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Opus 5 leads 86.1 to 13.3.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 98.9% for Claude Opus 5 and 4.6% for Gemini 1.5 Flash 8B.

## Snapshot

| | Claude Opus 5 | Gemini 1.5 Flash 8B |
|---|---|---|
| Provider | Anthropic | Google |
| Noometry Index | 67.7 | 29.7 |
| Rank | 4 | 292 |
| Context | 1M | — |
| Input $/M | $5 | — |
| Output $/M | $25 | — |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Opus 5: 67.0 (#5)
- Gemini 1.5 Flash 8B: 34.9 (#221)

| Benchmark | Claude Opus 5 | Gemini 1.5 Flash 8B |
|---|---|---|
| LMArena Coding | 1533 | 1218 |
| DeepSWE | 73.6% | — |
| FrontierCode | 53.4% | — |
| CursorBench | 46.6% | — |
| LMArena WebDev | 1694 | — |
| FrontierSWE | 52% | — |
| SciCode | 56.4% | — |
| WeirdML | 91.8% | — |
| ALE-Bench | 2,165 | — |

## Agentic & Tool Use

- Claude Opus 5: 55.5 (#1)
- Gemini 1.5 Flash 8B: —

| Benchmark | Claude Opus 5 | Gemini 1.5 Flash 8B |
|---|---|---|
| APEX-Agents | 65.8% | — |
| OSWorld 2.0 | 31.4% | — |
| τ²-bench Banking | 48.7% | — |
| PostTrainBench | 35% | — |
| BALROG | 63.4% | — |
| GBAEval | 79.6% | — |
| GDP.pdf | 24% | — |
| Vending-Bench 2 | 11,182 | — |

## Reasoning

- Claude Opus 5: 77.1 (#3)
- Gemini 1.5 Flash 8B: 19.2 (#242)

| Benchmark | Claude Opus 5 | Gemini 1.5 Flash 8B |
|---|---|---|
| LMArena Hard Prompts | 1525 | 1210 |
| DTBench | 97.9% | 50% |
| ARC-AGI-2 | 90.4% | — |
| SimpleBench | 80.6% | — |
| NYT Connections (extended) | 94.3% | — |
| ARC-AGI-1 | 97.5% | — |
| CritPt | 29.1% | — |
| Chess Puzzles | 42% | — |
| EBR-Bench | 45.7% | — |
| Mystery Game Puzzles | 59% | — |
| LMCA | 64.5% | — |
| Bench to the Future 3 | 0.12 | — |
| Epoch Capabilities Index | 162.67 | — |

## Math

- Claude Opus 5: 86.1 (#6)
- Gemini 1.5 Flash 8B: 13.3 (#296)

| Benchmark | Claude Opus 5 | Gemini 1.5 Flash 8B |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 98.9% | 4.6% |
| LMArena Math | 1533 | 1207 |
| FrontierMath (Tiers 1-3) | 85.6% | — |
| FrontierMath Tier 4 | 73.2% | — |
| ProofBench | 99% | — |

## Knowledge

- Claude Opus 5: 66.8 (#8)
- Gemini 1.5 Flash 8B: 16.0 (#285)

| Benchmark | Claude Opus 5 | Gemini 1.5 Flash 8B |
|---|---|---|
| GPQA Diamond | 93.9% | 33% |
| LMArena Expert | 1558 | 1185 |
| SimpleQA Verified | 59.9% | — |

## Multimodal

- Claude Opus 5: 51.1 (#6)
- Gemini 1.5 Flash 8B: 27.6 (#110)

| Benchmark | Claude Opus 5 | Gemini 1.5 Flash 8B |
|---|---|---|
| LMArena Vision | 1321 | 1044 |
| Blueprint-Bench 2 | 30.4% | — |
| Furniture Assembly | 60.8% | — |
| LMArena Document | 1516 | — |

## Multilingual

- Claude Opus 5: 58.8 (#3)
- Gemini 1.5 Flash 8B: 38.6 (#224)

| Benchmark | Claude Opus 5 | Gemini 1.5 Flash 8B |
|---|---|---|
| LMArena Non-English | 1500 | 1215 |
| LMArena Chinese | 1575 | 1231 |
| LMArena French | 1522 | 1233 |
| LMArena German | 1522 | 1206 |
| LMArena Japanese | 1510 | 1150 |
| LMArena Korean | 1526 | 1140 |
| LMArena Russian | 1507 | 1236 |
| LMArena Spanish | 1519 | 1212 |

## Instruction Following

- Claude Opus 5: 79.3 (#5)
- Gemini 1.5 Flash 8B: 63.1 (#231)

| Benchmark | Claude Opus 5 | Gemini 1.5 Flash 8B |
|---|---|---|
| LMArena Instruction Following | 1516 | 1199 |

## Long Context

- Claude Opus 5: 46.5 (#20)
- Gemini 1.5 Flash 8B: 36.9 (#220)

| Benchmark | Claude Opus 5 | Gemini 1.5 Flash 8B |
|---|---|---|
| LMArena Longer Query | 1516 | 1219 |

## Writing & Preference

- Claude Opus 5: 79.3 (#2)
- Gemini 1.5 Flash 8B: 43.0 (#227)

| Benchmark | Claude Opus 5 | Gemini 1.5 Flash 8B |
|---|---|---|
| LMArena Text | 1506 | 1226 |
| LMArena Creative Writing | 1491 | 1218 |
| LMArena Multi-Turn | 1496 | 1185 |
| EQ-Bench Creative Writing | 2133 | — |
| EQ-Bench 4 | 1385 | — |

## FAQ

### Is Claude Opus 5 better than Gemini 1.5 Flash 8B?

Claude Opus 5 is the stronger model overall, scoring 67.7 to 29.7 on the Noometry Index.

### Is Claude Opus 5 or Gemini 1.5 Flash 8B better for coding?

Claude Opus 5 scores higher on coding benchmarks: 67.0 versus 34.9 in the Noometry coding category.

### How many benchmarks do Claude Opus 5 and Gemini 1.5 Flash 8B share?

21 benchmarks have published results for both models. Claude Opus 5 has 57 scored results on Noometry and Gemini 1.5 Flash 8B has 21.