Gemini 3.1 Pro vs Gemini 3 Flash

Compare Google and Google AI models

Google

Gemini 3.1 Pro

Google

Gemini 3 Flash

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Cost Comparison (1000 input + 500 output tokens, 100 requests/day)

Gemini 3.1 Pro

Per Request:$0.008000

Daily:$0.80

Monthly:$24.00

Yearly:$292.00

Gemini 3 Flash

Per Request:$0.002000

Daily:$0.20

Monthly:$6.00

Yearly:$73.00

Cost Differences

$0.006000

Per Request

$0.60

Daily

$18.00

Monthly

$219.00

Yearly

Gemini 3 Flash costs less than Gemini 3.1 Pro

Feature Comparison

Feature	Gemini 3.1 Pro	Gemini 3 Flash
Provider	Google	Google
Input Price	$2.00/1M tokens	$0.50/1M tokens
Output Price	$12.00/1M tokens	$3.00/1M tokens
Context Window	1,000,000 tokens	1,000,000 tokens
Max Output	65,536 tokens	65,536 tokens
Category	flagship	efficient
Capabilities	textvisionaudiovideocodereasoning	textvisionaudiocode
Release Date	2/19/2026	12/17/2025

Gemini 3.1 Pro vs Gemini 3 Flash: Which Should You Choose?

Choosing between Gemini 3.1 Pro and Gemini 3 Flash depends on your priorities: cost efficiency, context length, or raw capability. Gemini 3 Flash is the more affordable option at $0.50/1M input tokens — 75% cheaper than Gemini 3.1 Pro.

These models target different tiers: Gemini 3.1 Pro is a flagship model while Gemini 3 Flash is efficient. This means they're optimized for different workloads. Gemini 3.1 Pro is built for complex tasks that require deeper reasoning, while Gemini 3 Flash offers better value for routine operations.

Output costs matter too. Gemini 3.1 Pro charges $12.00/1M output tokens vs $3.00 for Gemini 3 Flash. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. Gemini 3 Flash has the edge here at $3.00/1M output tokens.

Multimodal capabilities: Both models support vision (image understanding), so you can send images alongside text prompts with either option.

Best Use Cases

Choose Gemini 3.1 Pro when:

• You need more capabilities (video, reasoning)
• You're already using Google's API ecosystem

Choose Gemini 3 Flash when:

• Budget is a primary concern
• You're already using Google's API ecosystem
• You're running high-volume, latency-sensitive workloads

Try Different Scenarios

Use the calculator below to see how costs change with different usage patterns

Gemini 3.1 Pro (Google)

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Gemini 3 Flash (Google)

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Frequently Asked Questions

Which is cheaper, Gemini 3.1 Pro or Gemini 3 Flash?▼

Gemini 3 Flash is cheaper for input tokens at $0.50 per million tokens vs $2.00 for Gemini 3.1 Pro — that's 75% savings on input costs.

What is the context window difference between Gemini 3.1 Pro and Gemini 3 Flash?▼

Gemini 3.1 Pro supports 1,000,000 tokens while Gemini 3 Flash supports 1,000,000 tokens — a difference of 0 tokens in favor of Gemini 3.1 Pro.

Which model is better for AI Chatbot?▼

Both models support text. For ai chatbot, Gemini 3 Flash is the lower-cost option, while Gemini 3.1 Pro offers a larger context window (1,000,000 vs 1,000,000 tokens). Choose Gemini 3 Flash for budget sensitivity or Gemini 3.1 Pro for longer context tasks.

Which model has better overall pricing for heavy usage?▼

At 100 requests/day with 1,000 input and 500 output tokens each, Gemini 3.1 Pro costs about $24.00/month and Gemini 3 Flash costs about $6.00/month. Overall, Gemini 3 Flash has lower combined input + output rates ($0.50 in, $3.00 out) vs Gemini 3.1 Pro.