Model comparison
Gemini 2.5 Pro vs Gemini 3.5 Flash-Lite
Two Google tiers compared on the figures that decide which one a workload actually needs.
Catalog record checked September 2, 2026Individual provider fields may changeEvidence confidence: High — see receipts below
Gemini 2.5 Pro
Balanced
Gemini 3.5 Flash-Lite
Budget
| Specification | Gemini 2.5 Pro | Gemini 3.5 Flash-Lite |
|---|---|---|
| Provider | ||
| Tier | Balanced | Budget |
| Context window | Winner: 1.05M | 1M |
| Max output | Winner: 66K | 64K |
| Input / 1M tokens | $1.25 | Winner: $0.30 |
| Output / 1M tokens | $10 | Winner: $2.50 |
| Weights | Closed | Closed |
| Parameters | Not disclosedUnverified | Not disclosedUnverified |
| Reasoning levels | low, medium, high | low, medium, high |
| Modalities | text, image, video, audio, pdf | text, image, video, audio, pdf |
| API model id | gemini-2.5-pro | gemini-3.5-flash-lite |
| Released | June 17, 2025 | July 21, 2026 |
| Artificial Analysis Intelligence Index (2026-08-14) | Winner: 47 | 45 |
Prices are USD per million tokens at standard rates, excluding batch and caching discounts. Bold indicates the better figure where one is objectively better. Values we could not confirm from the provider are shown as “Not verified” rather than estimated.
Benchmark receipts
- 2026-08-14: Artificial AnalysisComposite index blending reasoning, knowledge, and coding evals into one 0–100 score. Comparability: directly comparable — AA occasionally rebaselines the index scale between snapshots — a score captured on one date is only comparable to same-snapshot scores (check measuredAt).
Pricing tiers: Gemini 2.5 Pro: $1.25/$10 per MTok (≤200K); $2.50/$15 (>200K). Legacy but still widely listed. · Gemini 3.5 Flash-Lite: $0.30/$2.50 per MTok. Cheapest Gemini Flash-Lite tier.
Gemini 2.5 Pro
Gemini 2.5 Pro is Google's previous-generation Pro with a 1.05M-token context and strong multimodal support.
Best for
- Long documents
- Multimodal input
- Google Workspace integration
Watch out
A generation behind Gemini 3.x; verify on your workload.
Gemini 3.5 Flash-Lite
Gemini 3.5 Flash-Lite is Google's cheapest tier for high-volume, latency-sensitive agent loops.
Best for
- High-volume agents
- Document pipelines
- Cost-sensitive multimodal
Watch out
Cheapest tier, not strongest on hard reasoning.
When the cheaper one wins
Gemini 3.5 Flash-Lite is cheaper on output at $2.50 per million tokens against $10 for Gemini 2.5 Pro — about 4.0×. Use the cheaper tier for classification, extraction, summarisation, and any task where the expensive model’s extra score does not change the accepted output. The expensive one only pays if your hardest task actually fails on the cheap tier. These are standard-tier API rates, excluding batch and cache discounts.
Run the model pickerEvidence confidence: High
How strong and complete the evidence behind this comparison is — not a prediction of which model is better.
- Pricing verified on both sides — Input and output rates are verified for both models.
- 4/5 core specs verified on both sides — Not published for at least one side: parameter count.
- 1 shared named benchmark with differing scores — Measured on: Artificial Analysis Intelligence Index.
- Verified within the last 90 days — Newest catalog check was 9 days ago.
- Both models carry source citations — Each side has at least two catalog sources on record.
Source receipts
Each catalog figure was checked against the provider or an independent second source on the date shown.
- Gemini 2.5 Pro: Google — Gemini 2.5 Pro GA (accessed 2026-08-29)
- Gemini 2.5 Pro: Google AI pricing (accessed 2026-08-29)
- Gemini 3.5 Flash-Lite: Google — Gemini 3.5 Flash-Lite (accessed 2026-08-29)
- Gemini 3.5 Flash-Lite: Google Cloud Gemini pricing (accessed 2026-08-29)
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Diving deeper on one model? Gemini 2.5 Pro · Gemini 3.5 Flash-Lite
Common questions
Gemini 2.5 Pro vs Gemini 3.5 Flash-Lite
Answered from the verified figures on this page rather than general guidance.
Is Gemini 2.5 Pro or Gemini 3.5 Flash-Lite cheaper for input?
Gemini 3.5 Flash-Lite is cheaper at $0.30 per million input tokens, against $1.25 for Gemini 2.5 Pro — roughly 4.2× the price. Output tokens usually dominate a real bill, so weigh the output rate more heavily than the input rate. These are base rates; Gemini 2.5 Pro has tiered pricing: $1.25/$10 per MTok (≤200K); $2.50/$15 (>200K). Legacy but still widely listed. Gemini 3.5 Flash-Lite has tiered pricing: $0.30/$2.50 per MTok. Cheapest Gemini Flash-Lite tier.
Is Gemini 2.5 Pro or Gemini 3.5 Flash-Lite cheaper for output?
Gemini 3.5 Flash-Lite is cheaper at $2.50 per million output tokens, against $10 for Gemini 2.5 Pro — roughly 4.0× the price. Output tokens usually dominate a real bill, so weigh the output rate more heavily than the input rate. These are base rates; Gemini 2.5 Pro has tiered pricing: $1.25/$10 per MTok (≤200K); $2.50/$15 (>200K). Legacy but still widely listed. Gemini 3.5 Flash-Lite has tiered pricing: $0.30/$2.50 per MTok. Cheapest Gemini Flash-Lite tier.
Which has the larger context window, Gemini 2.5 Pro or Gemini 3.5 Flash-Lite?
Gemini 2.5 Pro accepts 1.05M tokens against 1M for Gemini 3.5 Flash-Lite. This only matters if you routinely send very long documents or large codebases.
Do Gemini 2.5 Pro and Gemini 3.5 Flash-Lite support the same reasoning levels?
Yes — both accept the same effort settings: "low", "medium", "high". Higher effort costs more and takes longer, so start low and raise it only where output quality actually improves.
Should I use Gemini 2.5 Pro or Gemini 3.5 Flash-Lite?
Gemini 2.5 Pro is the balanced tier and Gemini 3.5 Flash-Lite the budget tier. The useful question is whether your hardest task actually fails on the cheaper one — most production volume such as classification, extraction and summarisation does not.
Next step
Choosing between them
The verified figures that separate this pair, computed from the catalog rather than restated boilerplate.
- Input price: Gemini 3.5 Flash-Lite costs $0.30 per 1M tokens versus $1.25 for Gemini 2.5 Pro — a 4.2x difference at the headline tier.
- Context: Gemini 2.5 Pro takes 1.05M against 1M for Gemini 3.5 Flash-Lite — only decisive if your prompts approach the smaller window.
- Measured capability: Gemini 2.5 Pro leads Artificial Analysis Intelligence Index 47 to 45 (measured 2026-08-14).
- Positioning: Gemini 2.5 Pro sits in the balanced tier, Gemini 3.5 Flash-Lite in the budget tier — most production volume (classification, extraction, summarisation) does not need the pricier tier.
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