Gemini 2.5 Pro vs Gemini 3.5 Flash (High)
Which is better for the money: Gemini 2.5 Pro by Google or Gemini 3.5 Flash (High) by Google? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-24.
Trade-off
Verdict
Depends on your budget
Gemini 3.5 Flash (High) scores 16.5 points higher (32.6 vs 16.1) but costs 5.1× as much to run the benchmark ($4222 vs $823; flagship vs premium cost classes). They are not alternatives at one budget: pick Gemini 3.5 Flash (High) when you need intelligence above 16.1, and Gemini 2.5 Pro when 16.1 is enough.
| Metric | Gemini 2.5 Pro | Gemini 3.5 Flash (High) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 16.1 | 32.6 | +102.5% Gemini 3.5 Flash (Hig… is 2.0× more intelligent |
| Total AA cost (lower is better) | $822.85 | $4,222.12 | +413.1% Gemini 3.5 Flash (Hig… is 5.1× more expensive |
| End-to-end time (lower is better) | 27.13s | 16.65s | −38.6% Gemini 3.5 Flash (Hig… is 38.6% faster |
| Price per 1M tokens (in / out) | $1.25 / $10.0 | $1.50 / $9.00 | |
| Input modalities | Text, Image, Speech, Video | Text, Image, Speech, Video |
Gemini 3.5 Flash (High) vs Gemini 2.5 Pro: 102.5% more intelligence, 413.1% more cost to run the AA benchmark, and 38.6% faster end-to-end.
Today's Pareto frontier
Against the frontier
- Gemini 2.5 Pro is off the frontier: at the same or lower cost, GPT-6.1 Sol (Xhigh) scores 51.00 for $662.
- Gemini 3.5 Flash (High) is off the frontier: at the same or lower cost, Claude Opus 5.5 (Xhigh, Default Fallback) scores 56.00 for $4057.
Gemini 2.5 ProGemini 3.5 Flash (High)Today's Pareto frontierEvery other model
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Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/gemini-2-5-pro/gemini-3-5-flash · Markdown: /api/v1/compare/gemini-2-5-pro/gemini-3-5-flash?format=md · llms.txt · agent skill