# Claude Sonnet 5.5 vs Gemini 3.5 Flash Lite

> Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 41.8 on the Noometry Index. Gemini 3.5 Flash Lite costs 4.7× less per token, which makes it the better buy when Claude Sonnet 5.5's lead doesn't matter for your workload.

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

## Summary

- They share 10 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 6 categories and Gemini 3.5 Flash Lite in 0 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Sonnet 5.5 leads 88.7 to 25.7.
- The biggest single-benchmark swing is ProofBench: 100% for Claude Sonnet 5.5 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 $2 / $10 for Claude Sonnet 5.5.
- Gemini 3.5 Flash Lite accepts more context: 1.05M tokens versus 1M.

## Snapshot

| | Claude Sonnet 5.5 | Gemini 3.5 Flash Lite |
|---|---|---|
| Provider | Anthropic | Google |
| Noometry Index | 60.5 | 41.8 |
| Rank | 10 | 113 |
| Context | 1M | 1.05M |
| Input $/M | $2 | $0.30 |
| Output $/M | $10 | $2.50 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Sonnet 5.5: 65.5 (#6)
- Gemini 3.5 Flash Lite: 42.1 (#96)

| Benchmark | Claude Sonnet 5.5 | Gemini 3.5 Flash Lite |
|---|---|---|
| LMArena WebDev | 1699 | 1440 |
| SciCode | 61% | 41.3% |
| ALE-Bench | 1,819 | 765.27 |
| FrontierCode | 52.1% | — |
| CursorBench | 55.5% | — |
| FrontierSWE | 61.9% | — |
| WeirdML | — | 39% |
| LMArena Coding | — | 1455 |

## Agentic & Tool Use

- Claude Sonnet 5.5: 44.9 (#14)
- Gemini 3.5 Flash Lite: 28.6 (#82)

| Benchmark | Claude Sonnet 5.5 | Gemini 3.5 Flash Lite |
|---|---|---|
| APEX-Agents | 75.5% | — |
| GDP.pdf | — | 10% |

## Reasoning

- Claude Sonnet 5.5: 52.4 (#29)
- Gemini 3.5 Flash Lite: 27.8 (#95)

| Benchmark | Claude Sonnet 5.5 | Gemini 3.5 Flash Lite |
|---|---|---|
| CritPt | 31.4% | 0% |
| Mystery Game Puzzles | 65% | 19% |
| ARC-AGI-2 | — | 10.3% |
| NYT Connections (extended) | — | 60.4% |
| ARC-AGI-1 | — | 53.5% |
| Chess Puzzles | — | 22% |
| LMArena Hard Prompts | — | 1441 |
| DTBench | — | 83.5% |
| LMCA | — | 37.6% |
| Epoch Capabilities Index | — | 145.12 |

## Math

- Claude Sonnet 5.5: 88.7 (#4)
- Gemini 3.5 Flash Lite: 25.7 (#245)

| Benchmark | Claude Sonnet 5.5 | Gemini 3.5 Flash Lite |
|---|---|---|
| FrontierMath (Tiers 1-3) | 88.8% | 26% |
| FrontierMath Tier 4 | 80.5% | 0% |
| OTIS Mock AIME 2024-2025 | 100% | 71.1% |
| ProofBench | 100% | 13% |
| LMArena Math | — | 1431 |

## Knowledge

- Claude Sonnet 5.5: 66.0 (#11)
- Gemini 3.5 Flash Lite: 50.0 (#66)

| Benchmark | Claude Sonnet 5.5 | Gemini 3.5 Flash Lite |
|---|---|---|
| GPQA Diamond | 95.6% | 83.3% |
| SimpleQA Verified | 46.5% | — |
| LMArena Expert | — | 1430 |

## Multimodal

- Claude Sonnet 5.5: 53.2 (#5)
- Gemini 3.5 Flash Lite: 40.3 (#38)

| Benchmark | Claude Sonnet 5.5 | Gemini 3.5 Flash Lite |
|---|---|---|
| LMArena Vision | — | 1266 |
| Furniture Assembly | 75% | — |

## Multilingual

- Claude Sonnet 5.5: —
- Gemini 3.5 Flash Lite: 53.8 (#59)

| Benchmark | Claude Sonnet 5.5 | Gemini 3.5 Flash Lite |
|---|---|---|
| LMArena Non-English | — | 1428 |
| LMArena Chinese | — | 1467 |
| LMArena French | — | 1452 |
| LMArena German | — | 1454 |
| LMArena Japanese | — | 1428 |
| LMArena Korean | — | 1406 |
| LMArena Russian | — | 1443 |
| LMArena Spanish | — | 1440 |

## Instruction Following

- Claude Sonnet 5.5: —
- Gemini 3.5 Flash Lite: 75.0 (#77)

| Benchmark | Claude Sonnet 5.5 | Gemini 3.5 Flash Lite |
|---|---|---|
| LMArena Instruction Following | — | 1420 |

## Long Context

- Claude Sonnet 5.5: —
- Gemini 3.5 Flash Lite: 43.8 (#80)

| Benchmark | Claude Sonnet 5.5 | Gemini 3.5 Flash Lite |
|---|---|---|
| LMArena Longer Query | — | 1435 |

## Writing & Preference

- Claude Sonnet 5.5: —
- Gemini 3.5 Flash Lite: 64.4 (#55)

| Benchmark | Claude Sonnet 5.5 | Gemini 3.5 Flash Lite |
|---|---|---|
| LMArena Text | — | 1436 |
| LMArena Creative Writing | — | 1419 |
| EQ-Bench Creative Writing | — | 1559 |
| LMArena Multi-Turn | — | 1445 |

## FAQ

### Is Claude Sonnet 5.5 better than Gemini 3.5 Flash Lite?

Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 41.8 on the Noometry Index. Gemini 3.5 Flash Lite costs 4.7× less per token, which makes it the better buy when Claude Sonnet 5.5's lead doesn't matter for your workload.

### Which is cheaper, Claude Sonnet 5.5 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 Sonnet 5.5 lists at $2 and $10.

### Is Claude Sonnet 5.5 or Gemini 3.5 Flash Lite better for coding?

Claude Sonnet 5.5 scores higher on coding benchmarks: 65.5 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 Sonnet 5.5 and Gemini 3.5 Flash Lite share?

10 benchmarks have published results for both models. Claude Sonnet 5.5 has 16 scored results on Noometry and Gemini 3.5 Flash Lite has 38.