# Claude Sonnet 5.5 vs Gemini 2.0 Flash (Feb 2025)

> Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 34.8 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-sonnet-5-5-vs-gemini-2-0-flash
- Last updated: 2026-10-10
- Shared benchmarks: 2

## Summary

- They share 2 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 6 categories and Gemini 2.0 Flash (Feb 2025) 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 36.1.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 100% for Claude Sonnet 5.5 and 57.8% for Gemini 2.0 Flash (Feb 2025).

## Snapshot

| | Claude Sonnet 5.5 | Gemini 2.0 Flash (Feb 2025) |
|---|---|---|
| Provider | Anthropic | Google |
| Noometry Index | 60.5 | 34.8 |
| Rank | 10 | 223 |
| Context | 1M | — |
| Input $/M | $2 | — |
| Output $/M | $10 | — |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Sonnet 5.5: 65.5 (#6)
- Gemini 2.0 Flash (Feb 2025): 28.2 (#308)

| Benchmark | Claude Sonnet 5.5 | Gemini 2.0 Flash (Feb 2025) |
|---|---|---|
| FrontierCode | 52.1% | — |
| SWE-bench Verified (bash only) | — | 13.5% |
| Aider Polyglot | — | 38.2% |
| CursorBench | 55.5% | — |
| LMArena WebDev | 1699 | — |
| FrontierSWE | 61.9% | — |
| SciCode | 61% | — |
| WeirdML | — | 25.8% |
| BigCodeBench Instruct | — | 45.9% |
| LiveBench Coding | — | 63.4% |
| LMArena Coding | — | 1351 |
| BigCodeBench Complete | — | 59.9% |
| CadEval | — | 30% |
| ALE-Bench | 1,819 | — |

## Agentic & Tool Use

- Claude Sonnet 5.5: 44.9 (#14)
- Gemini 2.0 Flash (Feb 2025): 28.0 (#85)

| Benchmark | Claude Sonnet 5.5 | Gemini 2.0 Flash (Feb 2025) |
|---|---|---|
| APEX-Agents | 75.5% | — |
| TheAgentCompany | — | 11.4% |

## Reasoning

- Claude Sonnet 5.5: 52.4 (#29)
- Gemini 2.0 Flash (Feb 2025): 15.2 (#308)

| Benchmark | Claude Sonnet 5.5 | Gemini 2.0 Flash (Feb 2025) |
|---|---|---|
| ARC-AGI-2 | — | 1.3% |
| SimpleBench | — | 31.1% |
| Kagi LLM Benchmark | — | 37.8% |
| CritPt | 31.4% | — |
| EnigmaEval | — | 1.1% |
| LiveBench Reasoning | — | 78.2% |
| LMArena Hard Prompts | — | 1346 |
| Mystery Game Puzzles | 65% | — |
| DTBench | — | 63.2% |
| LiveBench Data Analysis | — | 69.4% |
| Epoch Capabilities Index | — | 135.36 |
| LiveBench | — | 66.9% |

## Math

- Claude Sonnet 5.5: 88.7 (#4)
- Gemini 2.0 Flash (Feb 2025): 36.1 (#127)

| Benchmark | Claude Sonnet 5.5 | Gemini 2.0 Flash (Feb 2025) |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 100% | 57.8% |
| FrontierMath (Tiers 1-3) | 88.8% | — |
| FrontierMath Tier 4 | 80.5% | — |
| ProofBench | 100% | — |
| Omni-MATH | — | 45.9% |
| LiveBench Math | — | 75.8% |
| LMArena Math | — | 1351 |
| MATH Level 5 | — | 82.2% |
| FrontierMath (Feb 2025 set) | — | 1.7% |

## Knowledge

- Claude Sonnet 5.5: 66.0 (#11)
- Gemini 2.0 Flash (Feb 2025): 32.0 (#207)

| Benchmark | Claude Sonnet 5.5 | Gemini 2.0 Flash (Feb 2025) |
|---|---|---|
| GPQA Diamond | 95.6% | 64.1% |
| Humanity's Last Exam | — | 6.6% |
| SimpleQA Verified | 46.5% | — |
| MMLU-Pro | — | 73.7% |
| Confabulations | — | 12.4% |
| GPQA (HELM) | — | 55.6% |
| LMArena Expert | — | 1340 |
| MMLU | — | 79.7% |

## Multimodal

- Claude Sonnet 5.5: 53.2 (#5)
- Gemini 2.0 Flash (Feb 2025): 35.9 (#74)

| Benchmark | Claude Sonnet 5.5 | Gemini 2.0 Flash (Feb 2025) |
|---|---|---|
| LMArena Vision | — | 1158 |
| GeoBench | — | 77% |
| Furniture Assembly | 75% | — |

## Multilingual

- Claude Sonnet 5.5: —
- Gemini 2.0 Flash (Feb 2025): 47.6 (#144)

| Benchmark | Claude Sonnet 5.5 | Gemini 2.0 Flash (Feb 2025) |
|---|---|---|
| LMArena Non-English | — | 1342 |
| LMArena Chinese | — | 1373 |
| LMArena French | — | 1390 |
| LMArena German | — | 1354 |
| LMArena Japanese | — | 1293 |
| LMArena Korean | — | 1314 |
| LMArena Russian | — | 1351 |
| LMArena Spanish | — | 1363 |

## Instruction Following

- Claude Sonnet 5.5: —
- Gemini 2.0 Flash (Feb 2025): 74.6 (#91)

| Benchmark | Claude Sonnet 5.5 | Gemini 2.0 Flash (Feb 2025) |
|---|---|---|
| LiveBench Instruction Following | — | 85.8% |
| IFEval | — | 84.1% |
| LMArena Instruction Following | — | 1336 |

## Long Context

- Claude Sonnet 5.5: —
- Gemini 2.0 Flash (Feb 2025): 38.1 (#198)

| Benchmark | Claude Sonnet 5.5 | Gemini 2.0 Flash (Feb 2025) |
|---|---|---|
| Fiction.LiveBench | — | 61.1% |
| LMArena Longer Query | — | 1345 |

## Writing & Preference

- Claude Sonnet 5.5: —
- Gemini 2.0 Flash (Feb 2025): 49.8 (#184)

| Benchmark | Claude Sonnet 5.5 | Gemini 2.0 Flash (Feb 2025) |
|---|---|---|
| LMArena Text | — | 1354 |
| LMArena Creative Writing | — | 1340 |
| Short-Story Creative Writing | — | 73.8% |
| EQ-Bench Creative Writing | — | 1128 |
| WildBench | — | 80% |
| LMArena Multi-Turn | — | 1350 |
| LiveBench Language | — | 51.3% |

## FAQ

### Is Claude Sonnet 5.5 better than Gemini 2.0 Flash (Feb 2025)?

Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 34.8 on the Noometry Index.

### Is Claude Sonnet 5.5 or Gemini 2.0 Flash (Feb 2025) better for coding?

Claude Sonnet 5.5 scores higher on coding benchmarks: 65.5 versus 28.2 in the Noometry coding category.

### How many benchmarks do Claude Sonnet 5.5 and Gemini 2.0 Flash (Feb 2025) share?

2 benchmarks have published results for both models. Claude Sonnet 5.5 has 16 scored results on Noometry and Gemini 2.0 Flash (Feb 2025) has 54.