Gemini 3.1 Flash Lite Preview
by Google · google/gemini-3.1-flash-lite-preview · #173 cheapest of 422 paid models
Prices updated Sep 19, 2026, 6:21 PM UTC · refreshed hourly
Gemini 3.1 Flash Lite Preview is Google's high-efficiency model optimized for high-volume use cases. It outperforms Gemini 2.5 Flash Lite on overall quality and approaches Gemini 2.5 Flash performance across...
Compare vs:Claude Sonnet 5Claude Opus 4.6Claude Haiku 4.5GPT-5.6 Sol
Pricing
Input
$0.25
per 1M tokens
Output
$1.50
per 1M tokens
Blended (3:1)
$0.563
3 input : 1 output
Cache read
$0.025
per 1M cached tokens
Cache write
$0.083
per 1M tokens
Cache & batch economics
Effective prices for Gemini 3.1 Flash Lite Preview with prompt caching.
| Cache hit rate | Effective blended $/1M | Example request* | vs no cache |
|---|---|---|---|
| 0% | $0.563 | $0.027 | — |
| 50% | $0.478 | $0.0158 | −42% |
| 90% | $0.411 | $0.00675 | −75% |
*Example: 100K sticky context + 2K new input + 1K output. Batch discount is an approximate 50% off list rates for this provider’s batch API. Confirm on the vendor’s pricing page.
What a request costs
| Workload | Input tokens | Output tokens | Cost / request | Cost / 1K requests |
|---|---|---|---|---|
| Short chat message | 500 | 300 | $0.000575 | $0.575 |
| Document summary | 8,000 | 1,000 | $0.0035 | $3.50 |
| Codebase question (RAG) | 30,000 | 2,000 | $0.0105 | $10.50 |
| Long-context analysis | 150,000 | 5,000 | $0.045 | $45.00 |
Performance
Intelligence Index
16
AA composite quality
Coding Index
34.7
Math Index
—
Agentic Index
3.2
Output speed
0 tok/s
median
Time to first token
0s
median
Time to first answer
0s
after reasoning tokens
Artificial Analysis benchmarks
| Benchmark | Score |
|---|---|
| GPQA Diamond | 82.2% |
| Humanity's Last Exam | 17.2% |
| SciCode | 43.4% |
| IFBench | 77.2% |
| AA-LCR (Long Context Reasoning) | 74.3% |
| Terminal-Bench Hard | 24.2% |
| Terminal-Bench 2.1 | 31.1% |
| τ²-Bench (Telecom) | 31.3% |
| τ³-Bench Banking | 9.7% |
Design Arena Elo
| Category | Elo |
|---|---|
| Website | 1,095 |
| UI components | 1,087 |
| Data viz | 1,060 |
| SVG | 1,076 |
| 3D | 1,077 |
| Game dev | 1,053 |
| Code categories | 1,087 |
| ASCII art | 1,186 |
Specs
Context window
1.05M
tokens
Max output
66K
tokens
Input modalities
text, image, video, file, audio
Tokenizer
Gemini