Model comparison
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.
Last verified . 5 shared benchmarks.
GoogleSummary
- 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.
Side by side
| Claude 2.1 | Gemini 2.5 Flash | |
|---|---|---|
| Provider | Anthropic | |
| Noometry Index | 25.2 | 39.3 |
| Released | 2023-11-21 | 2025-04-17 |
| Weights | Proprietary | Proprietary |
| Context window | — | 1.05M |
| Max output | — | 66K |
| Input $ / M tokens | — | $0.30 |
| Output $ / M tokens | — | $2.50 |
| Results tracked | 7 | 54 |
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Category by category
Coding Gemini 2.5 Flash leads
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 Not comparable
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 leads
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 Gemini 2.5 Flash leads
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 Gemini 2.5 Flash leads
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 Not comparable
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 Not comparable
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 Not comparable
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 Not comparable
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 Not comparable
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 |
Frequently asked questions
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.