Gemini 3.5 Flash vs Gemini 3 Pro
Benchmarks, API pricing and specs, head to head. Data updated 2026-06-10.
Gemini 3.5 Flash
Google · May 2026
Google's I/O 2026 headliner: near-Pro intelligence at Flash speed, 78.8% on SWE-bench Verified with full multimodal input.
Gemini 3 Pro
73.6Google · Nov 2025
Google's November 2025 frontier breakout — 91.9% GPQA Diamond and 37.5% HLE made it the reasoning leader of its generation.
The verdict
Gemini 3.5 Flash wins 1 of the 1 benchmarks these models share, against 0 for Gemini 3 Pro. Gemini 3.5 Flash is about 1.3x cheaper per blended million tokens (3:1 input:output mix).
Benchmark head-to-head 1–0
Specs & pricing
| Gemini 3.5 Flash | Gemini 3 Pro | |
|---|---|---|
| modhub Index | — | 73.6 |
| Input price / 1M | $1.5 | $2 |
| Output price / 1M | $9 | $12 |
| Context window | 1M | 1M |
| Max output | 66K | 66K |
| Open weights | no | no |
| Reasoning model | yes | yes |
| Multimodal input | text, image, audio, video | text, image, audio, video |
| Knowledge cutoff | Feb 2026 | Jan 2025 |
| Released | May 2026 | Nov 2025 |
| Example monthly cost* | $28.50 | $38.00 |
* 10M input + 1.5M output tokens per month at list prices, no caching. Green = better value on that row.
Frequently asked questions
- Which is better, Gemini 3.5 Flash or Gemini 3 Pro?
- Gemini 3.5 Flash wins 1 of the 1 benchmarks these models share, against 0 for Gemini 3 Pro. Gemini 3.5 Flash is about 1.3x cheaper per blended million tokens (3:1 input:output mix).
- Which is cheaper, Gemini 3.5 Flash or Gemini 3 Pro?
- Gemini 3.5 Flash costs $1.5/$9 per million input/output tokens, while Gemini 3 Pro costs $2/$12. For a typical workload of 10M input and 1.5M output tokens per month, that's $28.50 versus $38.00.
- Which model is better for coding, Gemini 3.5 Flash or Gemini 3 Pro?
- On SWE-bench Verified — the standard agentic-coding benchmark — Gemini 3.5 Flash scores 78.8% versus 76.2% for Gemini 3 Pro, making Gemini 3.5 Flash the stronger pick for coding agents.
More comparisons
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