Model comparison
Gemini 1.5 Flash 8B vs Gemini 2.5 Flash
Gemini 2.5 Flash is the stronger model overall, scoring 39.3 to 29.9 on the Noometry Index.
Last verified . 20 shared benchmarks.
GoogleSummary
- They share 20 benchmarks with published results for both. Gemini 1.5 Flash 8B scores higher in 1 category and Gemini 2.5 Flash in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Gemini 2.5 Flash leads 39.9 to 14.2.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 4.6% for Gemini 1.5 Flash 8B and 73.1% for Gemini 2.5 Flash.
Side by side
| Gemini 1.5 Flash 8B | Gemini 2.5 Flash | |
|---|---|---|
| Provider | ||
| Noometry Index | 29.9 | 39.3 |
| Released | 2024-10-03 | 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 | 21 | 54 |
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Category by category
Coding Too close to call
Gemini 1.5 Flash 8B: 35.5 (#225), Gemini 2.5 Flash: 35.8 (#220)
| Benchmark | Gemini 1.5 Flash 8B | Gemini 2.5 Flash |
|---|---|---|
| LMArena Coding | 1218 | 1424 |
| SWE-bench Verified (bash only) | — | 28.7% |
| Aider Polyglot | — | 55.1% |
| WeirdML | — | 41.9% |
| ALE-Bench | — | 661.88 |
Agentic & Tool Use Not comparable
Gemini 1.5 Flash 8B: —, Gemini 2.5 Flash: 30.8 (#74)
| Benchmark | Gemini 1.5 Flash 8B | 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 Gemini 1.5 Flash 8B leads
Gemini 1.5 Flash 8B: 20.0 (#244), Gemini 2.5 Flash: 18.1 (#286)
| Benchmark | Gemini 1.5 Flash 8B | Gemini 2.5 Flash |
|---|---|---|
| LMArena Hard Prompts | 1209 | 1422 |
| DTBench | 50% | 76.5% |
| 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% |
| Epoch Capabilities Index | — | 143.03 |
| ForecastBench | — | 60.6 |
Math Gemini 2.5 Flash leads
Gemini 1.5 Flash 8B: 14.2 (#302), Gemini 2.5 Flash: 39.9 (#98)
| Benchmark | Gemini 1.5 Flash 8B | Gemini 2.5 Flash |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 4.6% | 73.1% |
| LMArena Math | 1207 | 1415 |
| Omni-MATH | — | 38.5% |
| FrontierMath (Feb 2025 set) | — | 4.8% |
| FrontierMath Tier 4 (v1) | — | 4.2% |
Knowledge Gemini 2.5 Flash leads
Gemini 1.5 Flash 8B: 16.0 (#289), Gemini 2.5 Flash: 36.4 (#168)
| Benchmark | Gemini 1.5 Flash 8B | Gemini 2.5 Flash |
|---|---|---|
| LMArena Expert | 1185 | 1426 |
| GPQA Diamond | 33% | — |
| Humanity's Last Exam | — | 12.1% |
| MMLU-Pro | — | 63.9% |
| Confabulations | — | 16.8% |
| Vectara Hallucination Rate | — | 7.8% |
| GPQA (HELM) | — | 39% |
Multimodal Gemini 2.5 Flash leads
Gemini 1.5 Flash 8B: 28.2 (#115), Gemini 2.5 Flash: 41.8 (#32)
| Benchmark | Gemini 1.5 Flash 8B | Gemini 2.5 Flash |
|---|---|---|
| LMArena Vision | 1044 | 1253 |
| GeoBench | — | 76% |
| VPCT | — | 46.2% |
| SpatialViz-Bench | — | 36.9% |
Multilingual Gemini 2.5 Flash leads
Gemini 1.5 Flash 8B: 38.5 (#229), Gemini 2.5 Flash: 52.3 (#88)
| Benchmark | Gemini 1.5 Flash 8B | Gemini 2.5 Flash |
|---|---|---|
| LMArena Non-English | 1215 | 1409 |
| LMArena Chinese | 1231 | 1450 |
| LMArena French | 1234 | 1433 |
| LMArena German | 1206 | 1418 |
| LMArena Japanese | 1150 | 1405 |
| LMArena Korean | 1140 | 1385 |
| LMArena Russian | 1236 | 1415 |
| LMArena Spanish | 1212 | 1421 |
Instruction Following Gemini 2.5 Flash leads
Gemini 1.5 Flash 8B: 62.8 (#236), Gemini 2.5 Flash: 75.7 (#54)
| Benchmark | Gemini 1.5 Flash 8B | Gemini 2.5 Flash |
|---|---|---|
| LMArena Instruction Following | 1199 | 1405 |
| IFEval | — | 89.8% |
Long Context Gemini 2.5 Flash leads
Gemini 1.5 Flash 8B: 37.0 (#225), Gemini 2.5 Flash: 47.5 (#17)
| Benchmark | Gemini 1.5 Flash 8B | Gemini 2.5 Flash |
|---|---|---|
| LMArena Longer Query | 1219 | 1419 |
| Fiction.LiveBench | — | 77.8% |
Writing & Preference Gemini 2.5 Flash leads
Gemini 1.5 Flash 8B: 42.8 (#232), Gemini 2.5 Flash: 53.8 (#157)
| Benchmark | Gemini 1.5 Flash 8B | Gemini 2.5 Flash |
|---|---|---|
| LMArena Text | 1226 | 1417 |
| LMArena Creative Writing | 1218 | 1400 |
| LMArena Multi-Turn | 1185 | 1408 |
| Short-Story Creative Writing | — | 76.5% |
| EQ-Bench Creative Writing | — | 1137 |
| WildBench | — | 81.7% |
Frequently asked questions
Is Gemini 1.5 Flash 8B better than Gemini 2.5 Flash?
Gemini 2.5 Flash is the stronger model overall, scoring 39.3 to 29.9 on the Noometry Index.
Is Gemini 1.5 Flash 8B or Gemini 2.5 Flash better for coding?
They score almost the same on coding (35.5 vs 35.8); test both on your own repository before choosing.
How many benchmarks do Gemini 1.5 Flash 8B and Gemini 2.5 Flash share?
20 benchmarks have published results for both models. Gemini 1.5 Flash 8B has 21 scored results on Noometry and Gemini 2.5 Flash has 54.