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Gemini 3.1 Flash-Lite vs Gemini 3.1 Pro

Complete pricing and performance comparison between Google's Gemini 3.1 Flash-Lite and Google's Gemini 3.1 Pro.

Quick Verdict

Cheaper
Gemini 3.1 Flash-Lite
8.0x cheaper input, 8.0x cheaper output
Larger Context
Gemini 3.1 Flash-Lite
1.0M vs 1.0M
Higher Quality
Gemini 3.1 Pro
Score: 57 vs 34
Faster
Gemini 3.1 Flash-Lite
230 vs 120 tok/s

Pricing Comparison

SpecGemini 3.1 Flash-LiteGemini 3.1 ProDifference
ProviderGoogleGoogle
Input / 1M tokens$0.25$2Gemini 3.1 Flash-Lite is 88% more expensive
Output / 1M tokens$1.5$12Gemini 3.1 Flash-Lite is 88% more expensive
Context Window1.0M1.0MSame
Max Output66K66K

Performance Benchmarks

MetricGemini 3.1 Flash-LiteGemini 3.1 ProWinner
Quality Index3457Gemini 3.1 Pro
Output Speed230 tok/s120 tok/sGemini 3.1 Flash-Lite
Time to First Token5.17s21.32sGemini 3.1 Flash-Lite
Value (Quality/$)134.028.6Higher = better value

Benchmark data from Artificial Analysis. Quality Index is a composite score across reasoning, coding, and knowledge tasks.

Cost at Scale

Estimated cost at different usage levels (3:1 input-to-output token ratio, typical for chat).

UsageGemini 3.1 Flash-LiteGemini 3.1 ProSavings
Single request
1K in / 300 out
$0.0007$0.0056Gemini 3.1 Flash-Lite saves $0.0049
10 requests
10K in / 3K out
$0.0070$0.056Gemini 3.1 Flash-Lite saves $0.049
100 requests
100K in / 30K out
$0.070$0.560Gemini 3.1 Flash-Lite saves $0.490
1,000 requests
1M in / 300K out
$0.700$5.60Gemini 3.1 Flash-Lite saves $4.90
10,000 requests
10M in / 3M out
$7.00$56.00Gemini 3.1 Flash-Lite saves $49.00
1M requests/mo
1B in / 300M out
$700.00$5600.00Gemini 3.1 Flash-Lite saves $4900.00

Pros & Cons

Gemini 3.1 Flash-Lite Strengths

  • +Cheaper input tokens
  • +Cheaper output tokens
  • +Faster output (230 vs 120 tok/s)
  • +Lower latency (faster first token)

Gemini 3.1 Pro Strengths

  • +Higher quality score (57 vs 34)

When to Use Each Model

Choose Gemini 3.1 Flash-Lite for

  • →Budget-conscious projects where cost is the primary factor
  • →Real-time applications, chat, or autocomplete

Choose Gemini 3.1 Pro for

  • →Tasks requiring maximum accuracy and reasoning

Frequently Asked Questions

Which is cheaper, Gemini 3.1 Flash-Lite or Gemini 3.1 Pro?
For input tokens, Gemini 3.1 Flash-Lite is 8.0x cheaper at $0.25/1M tokens. For output tokens, Gemini 3.1 Flash-Lite is 8.0x cheaper at $1.5/1M tokens. At typical usage (1M input + 300K output), Gemini 3.1 Flash-Lite costs $0.700 vs Gemini 3.1 Pro at $5.60.
What's the context window difference?
Gemini 3.1 Flash-Lite supports 1.0M context (1,048,576 tokens), while Gemini 3.1 Pro supports 1.0M (1,048,576 tokens). Gemini 3.1 Pro can handle 1x more context in a single request.
Which model has better benchmarks?
Quality Index: Gemini 3.1 Flash-Lite scores 34 vs Gemini 3.1 Pro at 57. Speed: Gemini 3.1 Flash-Lite generates 230 tok/s vs Gemini 3.1 Pro at 120 tok/s. Time to first token: Gemini 3.1 Flash-Lite at 5.17s vs Gemini 3.1 Pro at 21.32s.
When should I choose Gemini 3.1 Flash-Lite over Gemini 3.1 Pro?
Choose Gemini 3.1 Flash-Lite when you need: Cheaper input tokens, Cheaper output tokens, Faster output (230 vs 120 tok/s), Lower latency (faster first token). Choose Gemini 3.1 Pro when you need: Higher quality score (57 vs 34).
How much would 10,000 API requests cost?
At 1K input + 300 output tokens per request (typical chat): Gemini 3.1 Flash-Lite = $7.00, Gemini 3.1 Pro = $56.00. At 10K input + 1K output per request (longer conversations): Gemini 3.1 Flash-Lite = $40.00, Gemini 3.1 Pro = $320.00.

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Gemini 3.1 Flash-Lite DetailsGemini 3.1 Pro DetailsFull Pricing TableCost Calculator