Model comparison
Gemini 1.5 Flash (May 2024) vs Gemini 2.5 Flash
Gemini 2.5 Flash is the stronger model overall, scoring 39.3 to 33.2 on the Noometry Index.
Last verified . 31 shared benchmarks.
GoogleSummary
- They share 31 benchmarks with published results for both. Gemini 1.5 Flash (May 2024) scores higher in 1 category and Gemini 2.5 Flash in 9 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in math, where Gemini 2.5 Flash leads 39.9 to 22.1.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 16.3% for Gemini 1.5 Flash (May 2024) and 73.1% for Gemini 2.5 Flash.
Side by side
| Gemini 1.5 Flash (May 2024) | Gemini 2.5 Flash | |
|---|---|---|
| Provider | ||
| Noometry Index | 33.2 | 39.3 |
| Released | 2024-05-14 | 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 | 42 | 54 |
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Category by category
Coding Gemini 2.5 Flash leads
Gemini 1.5 Flash (May 2024): 34.4 (#236), Gemini 2.5 Flash: 35.8 (#220)
| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Flash |
|---|---|---|
| WeirdML | 24.9% | 41.9% |
| LMArena Coding | 1261 | 1424 |
| SWE-bench Verified (bash only) | — | 28.7% |
| Aider Polyglot | — | 55.1% |
| BigCodeBench Instruct | 43.5% | — |
| BigCodeBench Complete | 55.1% | — |
| ALE-Bench | — | 661.88 |
| HumanEval+ | 75.6% | — |
| MBPP+ | 67.5% | — |
Agentic & Tool Use Gemini 2.5 Flash leads
Gemini 1.5 Flash (May 2024): 26.6 (#102), Gemini 2.5 Flash: 30.8 (#74)
| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Flash |
|---|---|---|
| BALROG | 14.6% | 33.5% |
| Terminal-Bench | — | 17.1% |
| Berkeley Function Calling Leaderboard | — | 56.2% |
| TheAgentCompany | — | 41.1% |
| Vending-Bench 2 | — | 548.84 |
Reasoning Gemini 1.5 Flash (May 2024) leads
Gemini 1.5 Flash (May 2024): 21.7 (#215), Gemini 2.5 Flash: 18.1 (#286)
| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Flash |
|---|---|---|
| LMArena Hard Prompts | 1257 | 1422 |
| DTBench | 53.8% | 76.5% |
| Epoch Capabilities Index | 129.36 | 143.03 |
| ForecastBench | 53.9 | 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% |
| LMCA | — | 27.5% |
| PIQA | 87.5% | — |
Math Gemini 2.5 Flash leads
Gemini 1.5 Flash (May 2024): 22.1 (#281), Gemini 2.5 Flash: 39.9 (#98)
| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Flash |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 16.3% | 73.1% |
| Omni-MATH | 30.4% | 38.5% |
| LMArena Math | 1269 | 1415 |
| FrontierMath (Feb 2025 set) | 0% | 4.8% |
| MATH Level 5 | 61.9% | — |
| FrontierMath Tier 4 (v1) | — | 4.2% |
| GSM8K | 82.4% | — |
Knowledge Gemini 2.5 Flash leads
Gemini 1.5 Flash (May 2024): 26.2 (#260), Gemini 2.5 Flash: 36.4 (#168)
| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Flash |
|---|---|---|
| MMLU-Pro | 67.8% | 63.9% |
| GPQA (HELM) | 43.7% | 39% |
| LMArena Expert | 1233 | 1426 |
| GPQA Diamond | 47.3% | — |
| Humanity's Last Exam | — | 12.1% |
| Confabulations | — | 16.8% |
| Vectara Hallucination Rate | — | 7.8% |
| BoolQ | 85.8% | — |
| MMLU | 77.9% | — |
Multimodal Gemini 2.5 Flash leads
Gemini 1.5 Flash (May 2024): 36.0 (#81), Gemini 2.5 Flash: 41.8 (#32)
| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Flash |
|---|---|---|
| LMArena Vision | 1141 | 1253 |
| GeoBench | 76% | 76% |
| Video-MME | 70.3% | — |
| VPCT | — | 46.2% |
| SpatialViz-Bench | — | 36.9% |
Multilingual Gemini 2.5 Flash leads
Gemini 1.5 Flash (May 2024): 42.9 (#189), Gemini 2.5 Flash: 52.3 (#88)
| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Flash |
|---|---|---|
| LMArena Non-English | 1278 | 1409 |
| LMArena Chinese | 1295 | 1450 |
| LMArena French | 1258 | 1433 |
| LMArena German | 1262 | 1418 |
| LMArena Japanese | 1252 | 1405 |
| LMArena Korean | 1221 | 1385 |
| LMArena Russian | 1288 | 1415 |
| LMArena Spanish | 1243 | 1421 |
Instruction Following Gemini 2.5 Flash leads
Gemini 1.5 Flash (May 2024): 66.8 (#205), Gemini 2.5 Flash: 75.7 (#54)
| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Flash |
|---|---|---|
| IFEval | 83.1% | 89.8% |
| LMArena Instruction Following | 1258 | 1405 |
Long Context Gemini 2.5 Flash leads
Gemini 1.5 Flash (May 2024): 39.0 (#187), Gemini 2.5 Flash: 47.5 (#17)
| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Flash |
|---|---|---|
| LMArena Longer Query | 1284 | 1419 |
| Fiction.LiveBench | — | 77.8% |
Writing & Preference Gemini 2.5 Flash leads
Gemini 1.5 Flash (May 2024): 48.7 (#196), Gemini 2.5 Flash: 53.8 (#157)
| Benchmark | Gemini 1.5 Flash (May 2024) | Gemini 2.5 Flash |
|---|---|---|
| LMArena Text | 1287 | 1417 |
| LMArena Creative Writing | 1285 | 1400 |
| WildBench | 79.2% | 81.7% |
| LMArena Multi-Turn | 1253 | 1408 |
| Short-Story Creative Writing | — | 76.5% |
| EQ-Bench Creative Writing | — | 1137 |
Frequently asked questions
Is Gemini 1.5 Flash (May 2024) better than Gemini 2.5 Flash?
Gemini 2.5 Flash is the stronger model overall, scoring 39.3 to 33.2 on the Noometry Index.
Is Gemini 1.5 Flash (May 2024) or Gemini 2.5 Flash better for coding?
Gemini 2.5 Flash scores higher on coding benchmarks: 35.8 versus 34.4 in the Noometry coding category.
How many benchmarks do Gemini 1.5 Flash (May 2024) and Gemini 2.5 Flash share?
31 benchmarks have published results for both models. Gemini 1.5 Flash (May 2024) has 42 scored results on Noometry and Gemini 2.5 Flash has 54.