Gemini 3.5 Flash Lite vs Gemini 3.1 Flash-Lite — LLM API Cost Comparison
Compare Gemini 3.5 Flash Lite (Google) vs Gemini 3.1 Flash-Lite (Google) on cost per million tokens, context window, and monthly spend.
Prices verified 2026-08-03 · Pricing may change — use the calculator for current estimates
- Input
- $0.3/1M tokens
- Output
- $2.5/1M tokens
- Context
- 1M tokens
- Released
- 2026-07
Fastest low-cost Gemini 3.5 model for high-throughput tasks; 1M context
- Input
- $0.25/1M tokens
- Output
- $1.5/1M tokens
- Context
- 1M tokens
- Released
- 2026-04
Most cost-efficient Gemini; high-volume agentic tasks
Monthly Cost by Usage Tier (70% input / 30% output ratio)
| Usage | Gemini 3.5 Flash Lite | Gemini 3.1 Flash-Lite | Cheaper by |
|---|---|---|---|
| Light (1M tokens) | $0.960 | $0.625 | Gemini 3.1 Flash-Lite (35%) |
| Moderate (10M tokens) | $9.60 | $6.25 | Gemini 3.1 Flash-Lite (35%) |
| Heavy (100M tokens) | $96.00 | $62.50 | Gemini 3.1 Flash-Lite (35%) |
| Very Heavy (1B tokens) | $960 | $625 | Gemini 3.1 Flash-Lite (35%) |
Frequently Asked Questions
Which is cheaper — Gemini 3.5 Flash Lite or Gemini 3.1 Flash-Lite?
For input tokens, Gemini 3.1 Flash-Lite is cheaper at $0.25/1M tokens — 1.2× less than $0.3/1M. For output tokens, Gemini 3.1 Flash-Lite wins at $1.5/1M vs $2.5/1M. At heavy workloads (100M tokens/month), the cost difference can be significant.
What is the context window difference between Gemini 3.5 Flash Lite and Gemini 3.1 Flash-Lite?
Gemini 3.5 Flash Lite supports 1,048,576 tokens per request; Gemini 3.1 Flash-Lite supports 1,000,000 tokens. Gemini 3.5 Flash Lite wins on context length, making it better for long documents, large codebases, or extended conversations without chunking.
When should I choose Gemini 3.5 Flash Lite over Gemini 3.1 Flash-Lite?
Choose Gemini 3.5 Flash Lite (Google) if you prefer Google's ecosystem, tooling, or reliability track record. Fastest low-cost Gemini 3.5 model for high-throughput tasks; 1M context. Choose Gemini 3.1 Flash-Lite (Google) if Most cost-efficient Gemini; high-volume agentic tasks. the price/performance fits your workload better. Use this calculator to find the break-even point for your exact token volume.
How much does 1 billion tokens cost on Gemini 3.5 Flash Lite vs Gemini 3.1 Flash-Lite?
At 700M input + 300M output tokens (1B total): Gemini 3.5 Flash Lite costs $960; Gemini 3.1 Flash-Lite costs $625. The difference is $335/billion tokens at this 70/30 input/output ratio.