# Claude Opus 5 vs Gemini 3.5 Flash Lite

> Claude Opus 5 is the stronger model overall, scoring 67.7 to 41.8 on the Noometry Index. Gemini 3.5 Flash Lite costs 12× less per token, which makes it the better buy when Claude Opus 5's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/claude-opus-5-vs-gemini-3-5-flash-lite
- Last updated: 2026-10-10
- Shared benchmarks: 38

## Summary

- They share 38 benchmarks with published results for both. Claude Opus 5 scores higher in 10 categories and Gemini 3.5 Flash Lite in 0 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Opus 5 leads 86.1 to 25.7.
- The biggest single-benchmark swing is ProofBench: 99% for Claude Opus 5 and 13% for Gemini 3.5 Flash Lite.
- Gemini 3.5 Flash Lite is cheaper at $0.30 / $2.50 per million input/output tokens, against $5 / $25 for Claude Opus 5.
- Gemini 3.5 Flash Lite accepts more context: 1.05M tokens versus 1M.

## Snapshot

| | Claude Opus 5 | Gemini 3.5 Flash Lite |
|---|---|---|
| Provider | Anthropic | Google |
| Noometry Index | 67.7 | 41.8 |
| Rank | 4 | 113 |
| Context | 1M | 1.05M |
| Input $/M | $5 | $0.30 |
| Output $/M | $25 | $2.50 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Opus 5: 67.0 (#5)
- Gemini 3.5 Flash Lite: 42.1 (#96)

| Benchmark | Claude Opus 5 | Gemini 3.5 Flash Lite |
|---|---|---|
| LMArena WebDev | 1694 | 1440 |
| SciCode | 56.4% | 41.3% |
| WeirdML | 91.8% | 39% |
| LMArena Coding | 1533 | 1455 |
| ALE-Bench | 2,165 | 765.27 |
| DeepSWE | 73.6% | — |
| FrontierCode | 53.4% | — |
| CursorBench | 46.6% | — |
| FrontierSWE | 52% | — |

## Agentic & Tool Use

- Claude Opus 5: 55.5 (#1)
- Gemini 3.5 Flash Lite: 28.6 (#82)

| Benchmark | Claude Opus 5 | Gemini 3.5 Flash Lite |
|---|---|---|
| GDP.pdf | 24% | 10% |
| APEX-Agents | 65.8% | — |
| OSWorld 2.0 | 31.4% | — |
| τ²-bench Banking | 48.7% | — |
| PostTrainBench | 35% | — |
| BALROG | 63.4% | — |
| GBAEval | 79.6% | — |
| Vending-Bench 2 | 11,182 | — |

## Reasoning

- Claude Opus 5: 77.1 (#3)
- Gemini 3.5 Flash Lite: 27.8 (#95)

| Benchmark | Claude Opus 5 | Gemini 3.5 Flash Lite |
|---|---|---|
| ARC-AGI-2 | 90.4% | 10.3% |
| NYT Connections (extended) | 94.3% | 60.4% |
| ARC-AGI-1 | 97.5% | 53.5% |
| CritPt | 29.1% | 0% |
| Chess Puzzles | 42% | 22% |
| LMArena Hard Prompts | 1525 | 1441 |
| Mystery Game Puzzles | 59% | 19% |
| DTBench | 97.9% | 83.5% |
| LMCA | 64.5% | 37.6% |
| Epoch Capabilities Index | 162.67 | 145.12 |
| SimpleBench | 80.6% | — |
| EBR-Bench | 45.7% | — |
| Bench to the Future 3 | 0.12 | — |

## Math

- Claude Opus 5: 86.1 (#6)
- Gemini 3.5 Flash Lite: 25.7 (#245)

| Benchmark | Claude Opus 5 | Gemini 3.5 Flash Lite |
|---|---|---|
| FrontierMath (Tiers 1-3) | 85.6% | 26% |
| FrontierMath Tier 4 | 73.2% | 0% |
| OTIS Mock AIME 2024-2025 | 98.9% | 71.1% |
| ProofBench | 99% | 13% |
| LMArena Math | 1533 | 1431 |

## Knowledge

- Claude Opus 5: 66.8 (#8)
- Gemini 3.5 Flash Lite: 50.0 (#66)

| Benchmark | Claude Opus 5 | Gemini 3.5 Flash Lite |
|---|---|---|
| GPQA Diamond | 93.9% | 83.3% |
| LMArena Expert | 1558 | 1430 |
| SimpleQA Verified | 59.9% | — |

## Multimodal

- Claude Opus 5: 51.1 (#6)
- Gemini 3.5 Flash Lite: 40.3 (#38)

| Benchmark | Claude Opus 5 | Gemini 3.5 Flash Lite |
|---|---|---|
| LMArena Vision | 1321 | 1266 |
| Blueprint-Bench 2 | 30.4% | — |
| Furniture Assembly | 60.8% | — |
| LMArena Document | 1516 | — |

## Multilingual

- Claude Opus 5: 58.8 (#3)
- Gemini 3.5 Flash Lite: 53.8 (#59)

| Benchmark | Claude Opus 5 | Gemini 3.5 Flash Lite |
|---|---|---|
| LMArena Non-English | 1500 | 1428 |
| LMArena Chinese | 1575 | 1467 |
| LMArena French | 1522 | 1452 |
| LMArena German | 1522 | 1454 |
| LMArena Japanese | 1510 | 1428 |
| LMArena Korean | 1526 | 1406 |
| LMArena Russian | 1507 | 1443 |
| LMArena Spanish | 1519 | 1440 |

## Instruction Following

- Claude Opus 5: 79.3 (#5)
- Gemini 3.5 Flash Lite: 75.0 (#77)

| Benchmark | Claude Opus 5 | Gemini 3.5 Flash Lite |
|---|---|---|
| LMArena Instruction Following | 1516 | 1420 |

## Long Context

- Claude Opus 5: 46.5 (#20)
- Gemini 3.5 Flash Lite: 43.8 (#80)

| Benchmark | Claude Opus 5 | Gemini 3.5 Flash Lite |
|---|---|---|
| LMArena Longer Query | 1516 | 1435 |

## Writing & Preference

- Claude Opus 5: 79.3 (#2)
- Gemini 3.5 Flash Lite: 64.4 (#55)

| Benchmark | Claude Opus 5 | Gemini 3.5 Flash Lite |
|---|---|---|
| LMArena Text | 1506 | 1436 |
| LMArena Creative Writing | 1491 | 1419 |
| EQ-Bench Creative Writing | 2133 | 1559 |
| LMArena Multi-Turn | 1496 | 1445 |
| EQ-Bench 4 | 1385 | — |

## FAQ

### Is Claude Opus 5 better than Gemini 3.5 Flash Lite?

Claude Opus 5 is the stronger model overall, scoring 67.7 to 41.8 on the Noometry Index. Gemini 3.5 Flash Lite costs 12× less per token, which makes it the better buy when Claude Opus 5's lead doesn't matter for your workload.

### Which is cheaper, Claude Opus 5 or Gemini 3.5 Flash Lite?

Gemini 3.5 Flash Lite is cheaper. It lists at $0.30 per million input tokens and $2.50 per million output tokens; Claude Opus 5 lists at $5 and $25.

### Is Claude Opus 5 or Gemini 3.5 Flash Lite better for coding?

Claude Opus 5 scores higher on coding benchmarks: 67.0 versus 42.1 in the Noometry coding category.

### Which has the bigger context window?

Gemini 3.5 Flash Lite does, with 1.05M tokens against 1M.

### How many benchmarks do Claude Opus 5 and Gemini 3.5 Flash Lite share?

38 benchmarks have published results for both models. Claude Opus 5 has 57 scored results on Noometry and Gemini 3.5 Flash Lite has 38.