Gemini 3.1 Pro Preview Paid vs Gemini 3.5 Flash Paid
Gemini 3.1 Pro Preview vs Gemini 3.5 Flash compared — price per token, context window, multimodality, openness and which to choose. Full 2026 breakdown.
Gemini 3.1 Pro Preview — full profile › · Gemini 3.5 Flash — full profile ›
Prices & specs refreshed from live data · OpenSourceAI.tech
Open-model prices = cheapest provider via OpenRouter; official maker rates may be higher.
Gemini 3.1 Pro Preview vs Gemini 3.5 Flash specs
| Spec | Gemini 3.1 Pro Preview | Gemini 3.5 Flash |
|---|---|---|
| Maker | ||
| Type | Proprietary | Proprietary |
| Context window | 1M tokens | 1M tokens |
| Input price | $2/M | $1.5/M |
| Output price | $12/M | $9/M |
| Vision / multimodal | Yes | Yes |
| Tool / function calling | Yes | Yes |
| Self-hostable | No (API only) | No (API only) |
| License | Proprietary | Proprietary |
Feature comparison
| Capability | Gemini 3.1 Pro Preview | Gemini 3.5 Flash |
|---|---|---|
| Open weights (downloadable) | ✗ | ✗ |
| Self-hostable | ✗ | ✗ |
| Runs fully offline | ✗ | ✗ |
| Vision / multimodal | ✓ | ✓ |
| Tool / function calling | ✓ | ✓ |
| 1M+ context window | ✓ | ✓ |
Benchmarks: Gemini 3.1 Pro Preview vs Gemini 3.5 Flash
Independent benchmark scores measured by Artificial Analysis. Higher is better (except latency).
Benchmark data by Artificial Analysis.
How Gemini 3.1 Pro Preview and Gemini 3.5 Flash score
| Criterion | Gemini 3.1 Pro Preview | Gemini 3.5 Flash |
|---|---|---|
| Cost-efficiency | 3.5 | 3.5 |
| Context window | 5.0 | 5.0 |
| Openness | 1.5 | 1.5 |
| Self-hosting | 1.0 | 1.0 |
| Multimodality | 5.0 | 5.0 |
Scores come from live data — output price (cost), context length, open vs closed weights (openness & self-hosting) and vision/tool support (multimodality). Raw task quality isn't scored here; it depends on your benchmark — see the verdict.
What each model is
Gemini 3.1 Pro Preview Paid
Gemini 3.1 Pro Preview is Google’s frontier reasoning model, delivering enhanced software engineering performance, improved agentic reliability, and more efficient token usage across complex workflows. Building on the multimodal foundation.
Gemini 3.5 Flash Paid
Gemini 3.5 Flash is Google's high-efficiency multimodal model, bringing near-Pro level coding and reasoning at Flash-tier cost and speed. It is highly optimized for coding proficiency and parallel agentic execution...
Other models in these families
These variants are tracked but not compared here — one page per family keeps the comparison readable.
Frequently asked questions
Gemini 3.1 Pro Preview vs Gemini 3.5 Flash — which is cheaper?
Gemini 3.5 Flash is cheaper on output ($9/M vs $12/M).
Which has the larger context window?
Gemini 3.1 Pro Preview offers the larger context window (1M tokens).
Gemini 3.1 Pro Preview vs Gemini 3.5 Flash — which should I pick in 2026?
Choose Gemini 3.5 Flash for the lower output price ($9/M vs $12/M). Choose Gemini 3.1 Pro Preview if you need the larger 1M context window.
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