AI model comparison
Gemini 3.1 Pro Preview vs Gemini 3 Flash Preview
Pricing, context window, benchmarks, and features compared side by side. Or skip the guesswork and send one prompt to both.
Gemini 3.1 Pro Preview
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.
- Input / 1M
- $2
- Output / 1M
- $12
- Context
- 1.05M
Gemini 3 Flash Preview
Gemini 3 Flash Preview is a high speed, high value thinking model designed for agentic workflows, multi turn chat, and coding assistance.
- Input / 1M
- $0.50
- Output / 1M
- $3
- Context
- 1.05M
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
Gemini 3 Flash Preview
4x cheaper for a typical chat
Higher intelligence score
Gemini 3.1 Pro Preview
29.7 vs 26.3 on Artificial Analysis
Larger context window
Tie
1.05M vs 1.05M tokens
Newer release
Gemini 3.1 Pro Preview
Released February 19, 2026
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
Gemini 3.1 Pro Preview29.7Gemini 3 Flash Preview26.3Coding index
Gemini 3.1 Pro Preview68.8Gemini 3 Flash PreviewNot availableAgentic index
Gemini 3.1 Pro Preview8.2Gemini 3 Flash PreviewNot availablePricing
Gemini 3.1 Pro Preview vs Gemini 3 Flash Preview API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | Gemini 3.1 Pro Preview | Gemini 3 Flash Preview |
|---|---|---|
| Input tokensPer 1M tokens | $2 | $0.50 |
| Output tokensPer 1M tokens | $12 | $3 |
| Cached input (read)Per 1M tokens | $0.20 | $0.05 |
| Cache writePer 1M tokens | $0.38 | $0.08 |
| Long-context pricingPer 1M tokens, for very long prompts | $4 in / $18 out above 200K | Same rate at any length |
| Web searchPer request | $0.014 | $0.014 |
What it costs in practice
Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.
Chat message
2K in, 500 out
Gemini 3.1 Pro Preview$10Gemini 3 Flash Preview$2.50Coding task
30K in, 4K out
Gemini 3.1 Pro Preview$108$54 cachedGemini 3 Flash Preview$27$13.50 cachedLong document summary
150K in, 2K out
Gemini 3.1 Pro Preview$324$54 cachedGemini 3 Flash Preview$81$13.50 cachedSpecs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | Gemini 3.1 Pro Preview | Gemini 3 Flash Preview |
|---|---|---|
| Context window | 1.05M tokens | 1.05M tokens |
| Max output | 66K tokens | 66K tokens |
| Input types | Audio, File, Image, Text, Video | Audio, File, Image, Text, Video |
| Output types | Text | Text |
| Reasoning effort levels | High, Medium, Low | High, Medium, Low, Minimal |
| Default reasoning effort | Medium | Medium |
| Release date | February 19, 2026 | December 17, 2025 |
Features
Supported features
API features available for each model.
| Metric | Gemini 3.1 Pro Preview | Gemini 3 Flash Preview |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Supported | Supported |
| Stop sequences | Supported | Supported |
| Deterministic seed | Supported | Supported |
| Verbosity control | Not supported | Not supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
Gemini 3.1 Pro PreviewView full model details- Gemini 3.1 Pro Preview vs Claude Opus 5.5
- Gemini 3.1 Pro Preview vs GPT-6 Astra
- Gemini 3.1 Pro Preview vs GLM 5.2
- Gemini 3.1 Pro Preview vs Gemini 3.5 Flash
- Gemini 3.1 Pro Preview vs GPT-5.3-Codex
- Gemini 3.1 Pro Preview vs Claude Opus 4.6
- Gemini 3.1 Pro Preview vs GPT-5.2
- Gemini 3.1 Pro Preview vs Claude Sonnet 4.6
- Gemini 3.1 Pro Preview vs Qwen3.7 Max
- Gemini 3.1 Pro Preview vs Claude Opus 4.5
- Gemini 3.1 Pro Preview vs GPT-5.2-Codex
Gemini 3 Flash PreviewView full model details- Gemini 3 Flash Preview vs Hy4 preview
- Gemini 3 Flash Preview vs DeepSeek V4 Flash 0423
- Gemini 3 Flash Preview vs Step 5 Preview
- Gemini 3 Flash Preview vs MiniMax M3
- Gemini 3 Flash Preview vs Gemini 3.5 Flash Lite
- Gemini 3 Flash Preview vs MiMo-V2.5-Pro
- Gemini 3 Flash Preview vs Gemini 3.6 Flash
- Gemini 3 Flash Preview vs Kimi K2.6
- Gemini 3 Flash Preview vs GPT-5.4 Mini
- Gemini 3 Flash Preview vs Qwen3.7 Max
- Gemini 3 Flash Preview vs GLM 5
- Gemini 3 Flash Preview vs Grok Build 0.1
- Gemini 3 Flash Preview vs Qwen3.6 Plus
- Gemini 3 Flash Preview vs Qwen3.7 Plus
- Gemini 3 Flash Preview vs GLM 5 Turbo
- Gemini 3 Flash Preview vs GLM 5.1
- Gemini 3 Flash Preview vs Kimi K2.7 Code
- Gemini 3 Flash Preview vs Grok 4.20
- Gemini 3 Flash Preview vs Inkling Small
- Gemini 3 Flash Preview vs Inkling
- Gemini 3 Flash Preview vs Grok 4.3
- Gemini 3 Flash Preview vs GPT-5.1
- Gemini 3 Flash Preview vs GPT-5.1-Codex
- Gemini 3 Flash Preview vs Kimi K2.5
- Gemini 3 Flash Preview vs GLM 5V Turbo
- Gemini 3 Flash Preview vs GPT-5
- Gemini 3 Flash Preview vs Nemotron 3 Ultra
- Gemini 3 Flash Preview vs Qwen3.5 397B A17B
- Gemini 3 Flash Preview vs Qwen3.5-27B
- Gemini 3 Flash Preview vs Qwen3.6 27B
Our take
Gemini 3 Flash Preview is 4x cheaper for a typical chat. Gemini 3.1 Pro Preview scores higher on the Artificial Analysis Intelligence Index (29.7 vs 26.3). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.
FAQ
Frequently asked questions
Is Gemini 3.1 Pro Preview or Gemini 3 Flash Preview cheaper?
Gemini 3 Flash Preview is cheaper for a typical chat (2K input tokens and 500 output tokens). Gemini 3 Flash Preview costs $0.50 per 1M input tokens and $3 per 1M output tokens, while Gemini 3.1 Pro Preview costs $2 per 1M input tokens and $12 per 1M output tokens.
Which has a bigger context window, Gemini 3.1 Pro Preview or Gemini 3 Flash Preview?
Gemini 3.1 Pro Preview supports up to 1.05M tokens of context, compared with 1.05M for Gemini 3 Flash Preview.
Is Gemini 3.1 Pro Preview smarter than Gemini 3 Flash Preview?
On the Artificial Analysis Intelligence Index, Gemini 3.1 Pro Preview scores 29.7 and Gemini 3 Flash Preview scores 26.3, putting Gemini 3.1 Pro Preview ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use Gemini 3.1 Pro Preview and Gemini 3 Flash Preview at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see Gemini 3.1 Pro Preview and Gemini 3 Flash Preview answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to Gemini 3.1 Pro Preview and Gemini 3 Flash Preview at the same time. Compare the answers side by side and keep the best one.