Model comparison
Gemini 2.5 Flash vs Gemini 3.1 Flash Lite
Gemini 3.1 Flash Lite is the stronger model overall, scoring 40.8 to 39.3 on the Noometry Index.
Last verified . 30 shared benchmarks.
GoogleSummary
- They share 30 benchmarks with published results for both. Gemini 2.5 Flash scores higher in 4 categories and Gemini 3.1 Flash Lite in 6 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Gemini 3.1 Flash Lite leads 60.9 to 53.8.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 56.8% for Gemini 2.5 Flash and 67.2% for Gemini 3.1 Flash Lite.
- Gemini 3.1 Flash Lite is cheaper at $0.25 / $1.50 per million input/output tokens, against $0.30 / $2.50 for Gemini 2.5 Flash.
Side by side
| Gemini 2.5 Flash | Gemini 3.1 Flash Lite | |
|---|---|---|
| Provider | ||
| Noometry Index | 39.3 | 40.8 |
| Released | 2025-04-17 | 2026-03-03 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 1.05M |
| Max output | 66K | 66K |
| Input $ / M tokens | $0.30 | $0.25 |
| Output $ / M tokens | $2.50 | $1.50 |
| Results tracked | 54 | 38 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Gemini 3.1 Flash Lite leads
Gemini 2.5 Flash: 35.8 (#220), Gemini 3.1 Flash Lite: 37.8 (#188)
| Benchmark | Gemini 2.5 Flash | Gemini 3.1 Flash Lite |
|---|---|---|
| WeirdML | 41.9% | 52.2% |
| LMArena Coding | 1424 | 1400 |
| ALE-Bench | 661.88 | 797.73 |
| SWE-bench Verified (bash only) | 28.7% | — |
| Aider Polyglot | 55.1% | — |
| LMArena WebDev | — | 1256 |
| SciCode | — | 41.9% |
Agentic & Tool Use Too close to call
Gemini 2.5 Flash: 30.8 (#74), Gemini 3.1 Flash Lite: 30.2 (#79)
| Benchmark | Gemini 2.5 Flash | Gemini 3.1 Flash Lite |
|---|---|---|
| Terminal-Bench | 17.1% | — |
| Berkeley Function Calling Leaderboard | 56.2% | — |
| TheAgentCompany | 41.1% | — |
| DeepResearch Bench | — | 37.3% |
| BALROG | 33.5% | — |
| Vending-Bench 2 | 548.84 | — |
Reasoning Gemini 3.1 Flash Lite leads
Gemini 2.5 Flash: 18.1 (#286), Gemini 3.1 Flash Lite: 22.9 (#186)
| Benchmark | Gemini 2.5 Flash | Gemini 3.1 Flash Lite |
|---|---|---|
| Kagi LLM Benchmark | 56.8% | 67.2% |
| CritPt | 1.1% | 1.1% |
| EnigmaEval | 2.7% | 3% |
| LMArena Hard Prompts | 1422 | 1407 |
| DTBench | 76.5% | 76.8% |
| LMCA | 27.5% | 35% |
| Epoch Capabilities Index | 143.03 | 144.47 |
| ForecastBench | 60.6 | 54.4 |
| ARC-AGI-2 | 2.5% | — |
| SimpleBench | 41.2% | — |
| NYT Connections (extended) | — | 8.2% |
| ARC-AGI-1 | 33.3% | — |
| Chess Puzzles | — | 25% |
| Thematic Generalization | — | 63.3% |
Math Too close to call
Gemini 2.5 Flash: 39.9 (#98), Gemini 3.1 Flash Lite: 40.7 (#90)
| Benchmark | Gemini 2.5 Flash | Gemini 3.1 Flash Lite |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 73.1% | 80% |
| LMArena Math | 1415 | 1428 |
| FrontierMath (Tiers 1-3) | — | 27.7% |
| Omni-MATH | 38.5% | — |
| FrontierMath (Feb 2025 set) | 4.8% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Gemini 3.1 Flash Lite leads
Gemini 2.5 Flash: 36.4 (#168), Gemini 3.1 Flash Lite: 41.9 (#104)
| Benchmark | Gemini 2.5 Flash | Gemini 3.1 Flash Lite |
|---|---|---|
| Humanity's Last Exam | 12.1% | 8.6% |
| Vectara Hallucination Rate | 7.8% | 8.2% |
| LMArena Expert | 1426 | 1398 |
| GPQA Diamond | — | 81.8% |
| MMLU-Pro | 63.9% | — |
| Confabulations | 16.8% | — |
| GPQA (HELM) | 39% | — |
Multimodal Gemini 2.5 Flash leads
Gemini 2.5 Flash: 41.8 (#32), Gemini 3.1 Flash Lite: 39.4 (#60)
| Benchmark | Gemini 2.5 Flash | Gemini 3.1 Flash Lite |
|---|---|---|
| LMArena Vision | 1253 | 1240 |
| GeoBench | 76% | — |
| VPCT | 46.2% | — |
| SpatialViz-Bench | 36.9% | — |
Multilingual Too close to call
Gemini 2.5 Flash: 52.3 (#88), Gemini 3.1 Flash Lite: 52.3 (#86)
| Benchmark | Gemini 2.5 Flash | Gemini 3.1 Flash Lite |
|---|---|---|
| LMArena Non-English | 1409 | 1411 |
| LMArena Chinese | 1450 | 1461 |
| LMArena French | 1433 | 1424 |
| LMArena German | 1418 | 1429 |
| LMArena Japanese | 1405 | 1413 |
| LMArena Korean | 1385 | 1392 |
| LMArena Russian | 1415 | 1420 |
| LMArena Spanish | 1421 | 1421 |
Instruction Following Gemini 2.5 Flash leads
Gemini 2.5 Flash: 75.7 (#54), Gemini 3.1 Flash Lite: 72.7 (#131)
| Benchmark | Gemini 2.5 Flash | Gemini 3.1 Flash Lite |
|---|---|---|
| LMArena Instruction Following | 1405 | 1377 |
| IFEval | 89.8% | — |
Long Context Gemini 2.5 Flash leads
Gemini 2.5 Flash: 47.5 (#17), Gemini 3.1 Flash Lite: 42.5 (#122)
| Benchmark | Gemini 2.5 Flash | Gemini 3.1 Flash Lite |
|---|---|---|
| LMArena Longer Query | 1419 | 1394 |
| Fiction.LiveBench | 77.8% | — |
Writing & Preference Gemini 3.1 Flash Lite leads
Gemini 2.5 Flash: 53.8 (#157), Gemini 3.1 Flash Lite: 60.9 (#94)
| Benchmark | Gemini 2.5 Flash | Gemini 3.1 Flash Lite |
|---|---|---|
| LMArena Text | 1417 | 1416 |
| LMArena Creative Writing | 1400 | 1401 |
| LMArena Multi-Turn | 1408 | 1417 |
| Short-Story Creative Writing | 76.5% | — |
| EQ-Bench Creative Writing | 1137 | — |
| WildBench | 81.7% | — |
Frequently asked questions
Is Gemini 2.5 Flash better than Gemini 3.1 Flash Lite?
Gemini 3.1 Flash Lite is the stronger model overall, scoring 40.8 to 39.3 on the Noometry Index.
Which is cheaper, Gemini 2.5 Flash or Gemini 3.1 Flash Lite?
Gemini 3.1 Flash Lite is cheaper. It lists at $0.25 per million input tokens and $1.50 per million output tokens; Gemini 2.5 Flash lists at $0.30 and $2.50.
Is Gemini 2.5 Flash or Gemini 3.1 Flash Lite better for coding?
Gemini 3.1 Flash Lite scores higher on coding benchmarks: 37.8 versus 35.8 in the Noometry coding category.
Which has the bigger context window?
Both accept 1.05M tokens.
How many benchmarks do Gemini 2.5 Flash and Gemini 3.1 Flash Lite share?
30 benchmarks have published results for both models. Gemini 2.5 Flash has 54 scored results on Noometry and Gemini 3.1 Flash Lite has 38.