Model comparison
Gemini 2.5 Flash vs Gemini 3.5 Flash-Lite
Head-to-head evidence from 10 shared benchmark results across 4 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Gemini 2.5 Flash #130 (Supported); Gemini 3.5 Flash-Lite unranked (Not scored). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Gemini 2.5 Flash and Gemini 3.5 Flash-Lite share 10 comparable benchmark results. 0 of 8 categories are comparable. 5 results are unique to Gemini 2.5 Flash; 11 to Gemini 3.5 Flash-Lite.
Updated July 21, 2026- Shared results
- 10
- Gemini 2.5 Flash only
- 5
- Gemini 3.5 Flash-Lite only
- 11
- Comparable categories
- 0 / 8
Benchmark data for Gemini 2.5 Flash and Gemini 3.5 Flash-Lite is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 10 shared benchmark results across 4 evidence categories; 0 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
BenchLM has partial data for these models, but not enough overlapping benchmark coverage to produce a fair score-level comparison yet.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | Gemini 2.5 Flash | Δ | Gemini 3.5 Flash-Lite |
|---|---|---|---|
| Agentic | Gemini 2.5 FlashNot measured | MarginNo overlap | Gemini 3.5 Flash-Lite63.4 |
| Coding | Gemini 2.5 FlashNot measured | MarginNo overlap | Gemini 3.5 Flash-Lite54.2 |
| Reasoning | Gemini 2.5 FlashNot measured | MarginNo overlap | Gemini 3.5 Flash-Lite72.2 |
| Math | Gemini 2.5 Flash4.7 | MarginNo overlap | Gemini 3.5 Flash-LiteNot measured |
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Gemini 2.5 Flash | Gemini 3.5 Flash-Lite | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Gemini 2.5 Flash$0.3 input / $2.5 output | Gemini 3.5 Flash-Lite$0.3 input / $2.5 output | Listed prices are equal. |
| Generation speedtokens per second | Gemini 2.5 Flash221 tok/s | Gemini 3.5 Flash-LiteNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Gemini 2.5 Flash0.50 s | Gemini 3.5 Flash-LiteNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Gemini 2.5 Flash1M | Gemini 3.5 Flash-Lite1M | Listed context windows are equal. |
Benchmark Deep Dive
Agentic8 benchmarks
| Benchmark | Gemini 2.5 Flash | Gemini 3.5 Flash-Lite | Result |
|---|---|---|---|
| τ²-bench resultsSource | 14.9% | — | Not comparable |
| Terminal-Bench 2.0Source | — | 54% | Not comparable |
| OSWorld-VerifiedSource | — | 74% | Not comparable |
| GDPval-AASource | — | 1140 | Not comparable |
| AA Agentic IndexSource | — | 26.8% | Not comparable |
| GDPval-AASource | — | 32.0% | Not comparable |
| AA BriefcaseSource | — | 634 | Not comparable |
| AA Tau3 BankingSource | — | 16.5% | Not comparable |
Coding4 benchmarks
Reasoning3 benchmarks
Knowledge6 benchmarks
| Benchmark | Gemini 2.5 Flash | Gemini 3.5 Flash-Lite | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 14.1% | 36.5% | Gemini 3.5 Flash-Lite leads |
| AA-GPQA DiamondSource | 68.3% | 83.8% | Gemini 3.5 Flash-Lite leads |
| AA-HLESource | 5.1% | 17.5% | Gemini 3.5 Flash-Lite leads |
| AA-Omniscience IndexSource | -42.0% | 6.9% | Gemini 3.5 Flash-Lite leads |
| AA-Omniscience AccuracySource | 26.5% | 30.3% | Gemini 3.5 Flash-Lite leads |
| AA-Omniscience Hallucination RateSource | 93.3% | 33.5% | Gemini 3.5 Flash-Lite leads |
Math2 benchmarks
Multimodal2 benchmarks
Inst. Following1 benchmarks
| Benchmark | Gemini 2.5 Flash | Gemini 3.5 Flash-Lite | Result |
|---|---|---|---|
| AA-IFBenchSource | 39.0% | — | Not comparable |
Frequently Asked Questions (3)
Can I compare Gemini 2.5 Flash and Gemini 3.5 Flash-Lite on BenchLM yet?
Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.
Why does this comparison show “coming soon”?
BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.
What data is available for Gemini 2.5 Flash and Gemini 3.5 Flash-Lite today?
Gemini 2.5 Flash: $0.30 input / $2.50 output per 1M tokens Gemini 3.5 Flash-Lite: $0.30 input / $2.50 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.
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