# Claude 2.1 vs Gemini 2.5 Flash

> Gemini 2.5 Flash is the stronger model overall, scoring 39.3 to 25.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-2-1-vs-gemini-2-5-flash
- Last updated: 2026-10-10
- Shared benchmarks: 5

## Summary

- They share 5 benchmarks with published results for both. Claude 2.1 scores higher in 1 category and Gemini 2.5 Flash in 3 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in math, where Gemini 2.5 Flash leads 39.9 to 10.2.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 1.9% for Claude 2.1 and 73.1% for Gemini 2.5 Flash.

## Snapshot

| | Claude 2.1 | Gemini 2.5 Flash |
|---|---|---|
| Provider | Anthropic | Google |
| Noometry Index | 25.2 | 39.3 |
| Rank | 345 | 170 |
| Context | — | 1.05M |
| Input $/M | — | $0.30 |
| Output $/M | — | $2.50 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude 2.1: 26.2 (#327)
- Gemini 2.5 Flash: 35.8 (#220)

| Benchmark | Claude 2.1 | Gemini 2.5 Flash |
|---|---|---|
| WeirdML | 7.1% | 41.9% |
| SWE-bench Verified (bash only) | — | 28.7% |
| Aider Polyglot | — | 55.1% |
| LMArena Coding | — | 1424 |
| ALE-Bench | — | 661.88 |

## Agentic & Tool Use

- Claude 2.1: —
- Gemini 2.5 Flash: 30.8 (#74)

| Benchmark | Claude 2.1 | Gemini 2.5 Flash |
|---|---|---|
| Terminal-Bench | — | 17.1% |
| Berkeley Function Calling Leaderboard | — | 56.2% |
| TheAgentCompany | — | 41.1% |
| BALROG | — | 33.5% |
| Vending-Bench 2 | — | 548.84 |

## Reasoning

- Claude 2.1: 21.4 (#221)
- Gemini 2.5 Flash: 18.1 (#286)

| Benchmark | Claude 2.1 | Gemini 2.5 Flash |
|---|---|---|
| DTBench | 51% | 76.5% |
| Epoch Capabilities Index | 119.27 | 143.03 |
| ForecastBench | 54.2 | 60.6 |
| ARC-AGI-2 | — | 2.5% |
| SimpleBench | — | 41.2% |
| Kagi LLM Benchmark | — | 56.8% |
| ARC-AGI-1 | — | 33.3% |
| CritPt | — | 1.1% |
| EnigmaEval | — | 2.7% |
| LMArena Hard Prompts | — | 1422 |
| LMCA | — | 27.5% |

## Math

- Claude 2.1: 10.2 (#315)
- Gemini 2.5 Flash: 39.9 (#98)

| Benchmark | Claude 2.1 | Gemini 2.5 Flash |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 1.9% | 73.1% |
| Omni-MATH | — | 38.5% |
| LMArena Math | — | 1415 |
| FrontierMath (Feb 2025 set) | — | 4.8% |
| FrontierMath Tier 4 (v1) | — | 4.2% |

## Knowledge

- Claude 2.1: 15.4 (#292)
- Gemini 2.5 Flash: 36.4 (#168)

| Benchmark | Claude 2.1 | Gemini 2.5 Flash |
|---|---|---|
| GPQA Diamond | 33% | — |
| Humanity's Last Exam | — | 12.1% |
| MMLU-Pro | — | 63.9% |
| Confabulations | — | 16.8% |
| Vectara Hallucination Rate | — | 7.8% |
| GPQA (HELM) | — | 39% |
| LMArena Expert | — | 1426 |
| MMLU | 73.5% | — |

## Multimodal

- Claude 2.1: —
- Gemini 2.5 Flash: 41.8 (#32)

| Benchmark | Claude 2.1 | Gemini 2.5 Flash |
|---|---|---|
| LMArena Vision | — | 1253 |
| GeoBench | — | 76% |
| VPCT | — | 46.2% |
| SpatialViz-Bench | — | 36.9% |

## Multilingual

- Claude 2.1: —
- Gemini 2.5 Flash: 52.3 (#88)

| Benchmark | Claude 2.1 | Gemini 2.5 Flash |
|---|---|---|
| LMArena Non-English | — | 1409 |
| LMArena Chinese | — | 1450 |
| LMArena French | — | 1433 |
| LMArena German | — | 1418 |
| LMArena Japanese | — | 1405 |
| LMArena Korean | — | 1385 |
| LMArena Russian | — | 1415 |
| LMArena Spanish | — | 1421 |

## Instruction Following

- Claude 2.1: —
- Gemini 2.5 Flash: 75.7 (#54)

| Benchmark | Claude 2.1 | Gemini 2.5 Flash |
|---|---|---|
| IFEval | — | 89.8% |
| LMArena Instruction Following | — | 1405 |

## Long Context

- Claude 2.1: —
- Gemini 2.5 Flash: 47.5 (#17)

| Benchmark | Claude 2.1 | Gemini 2.5 Flash |
|---|---|---|
| Fiction.LiveBench | — | 77.8% |
| LMArena Longer Query | — | 1419 |

## Writing & Preference

- Claude 2.1: —
- Gemini 2.5 Flash: 53.8 (#157)

| Benchmark | Claude 2.1 | Gemini 2.5 Flash |
|---|---|---|
| LMArena Text | — | 1417 |
| LMArena Creative Writing | — | 1400 |
| Short-Story Creative Writing | — | 76.5% |
| EQ-Bench Creative Writing | — | 1137 |
| WildBench | — | 81.7% |
| LMArena Multi-Turn | — | 1408 |

## FAQ

### Is Claude 2.1 better than Gemini 2.5 Flash?

Gemini 2.5 Flash is the stronger model overall, scoring 39.3 to 25.2 on the Noometry Index.

### Is Claude 2.1 or Gemini 2.5 Flash better for coding?

Gemini 2.5 Flash scores higher on coding benchmarks: 35.8 versus 26.2 in the Noometry coding category.

### How many benchmarks do Claude 2.1 and Gemini 2.5 Flash share?

5 benchmarks have published results for both models. Claude 2.1 has 7 scored results on Noometry and Gemini 2.5 Flash has 54.