Model comparison
Gemini 3.5 Flash-Lite vs Gemini 3 Pro Deep Think
Head-to-head evidence from 1 shared benchmark result across 1 category. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Gemini 3.5 Flash-Lite unranked (Not scored); Gemini 3 Pro Deep Think #41 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Gemini 3.5 Flash-Lite and Gemini 3 Pro Deep Think share 1 comparable benchmark result. 1 of 8 categories are comparable. 20 results are unique to Gemini 3.5 Flash-Lite; 1 to Gemini 3 Pro Deep Think.
Updated July 21, 2026- Shared results
- 1
- Gemini 3.5 Flash-Lite only
- 20
- Gemini 3 Pro Deep Think only
- 1
- Comparable categories
- 1 / 8
Treat this as a split decision. Gemini 3.5 Flash-Lite makes more sense if reasoning is the priority; Gemini 3 Pro Deep Think is the better fit if you need the larger 2M context window.
Confidence note. This is a partial-evidence comparison with 1 shared benchmark result across 1 evidence category; 1 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
Gemini 3.5 Flash-Lite and Gemini 3 Pro Deep Think finish on the same BenchAlign overall score, so this is less about a single winner and more about where the edge shows up. The BenchAlign headline says tie; the benchmark table is where the real choice happens.
Gemini 3 Pro Deep Think gives you the larger context window at 2M, compared with 1M for Gemini 3.5 Flash-Lite.
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 3.5 Flash-Lite | Δ | Gemini 3 Pro Deep Think |
|---|---|---|---|
| Reasoning | Gemini 3.5 Flash-Lite72.2 | Margin← 27.1 | Gemini 3 Pro Deep Think45.1 |
| Agentic | Gemini 3.5 Flash-Lite63.4 | MarginNo overlap | Gemini 3 Pro Deep ThinkNot measured |
| Coding | Gemini 3.5 Flash-Lite54.2 | MarginNo overlap | Gemini 3 Pro Deep ThinkNot measured |
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Gemini 3.5 Flash-Lite | Gemini 3 Pro Deep Think | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Gemini 3.5 Flash-Lite$0.3 input / $2.5 output | Gemini 3 Pro Deep ThinkNot available | A complete price comparison is not available. |
| Generation speedtokens per second | Gemini 3.5 Flash-LiteNot available | Gemini 3 Pro Deep ThinkNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Gemini 3.5 Flash-LiteNot available | Gemini 3 Pro Deep ThinkNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Gemini 3.5 Flash-Lite1M | Gemini 3 Pro Deep Think2M | Gemini 3 Pro Deep Think lists the larger context window. |
Benchmark Deep Dive
Agentic7 benchmarks
| Benchmark | Gemini 3.5 Flash-Lite | Gemini 3 Pro Deep Think | Result |
|---|---|---|---|
| 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
ReasoningGemini 3.5 Flash-Lite wins4 benchmarks
Knowledge6 benchmarks
| Benchmark | Gemini 3.5 Flash-Lite | Gemini 3 Pro Deep Think | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 36.5% | — | Not comparable |
| AA-GPQA DiamondSource | 83.8% | — | Not comparable |
| AA-HLESource | 17.5% | — | Not comparable |
| AA-Omniscience IndexSource | 6.9% | — | Not comparable |
| AA-Omniscience AccuracySource | 30.3% | — | Not comparable |
| AA-Omniscience Hallucination RateSource | 33.5% | — | Not comparable |
Multimodal1 benchmarks
| Benchmark | Gemini 3.5 Flash-Lite | Gemini 3 Pro Deep Think | Result |
|---|---|---|---|
| AA-MMMU-ProSource | 79.0% | — | Not comparable |
Frequently Asked Questions (2)
Which is better, Gemini 3.5 Flash-Lite or Gemini 3 Pro Deep Think?
Gemini 3.5 Flash-Lite and Gemini 3 Pro Deep Think are tied on the BenchAlign overall score, so the right pick depends on which category matters most for your use case.
Which is better for reasoning, Gemini 3.5 Flash-Lite or Gemini 3 Pro Deep Think?
Gemini 3.5 Flash-Lite has the edge for reasoning in this comparison, averaging 72.2 versus 45.1. Inside this category, CritPt is the benchmark that creates the most daylight between them.
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