AI Model Intelligence

Gemini 3.1 Flash Lite

google/gemini-3-1-flash-lite

By Google · family: gemini-flash-lite · released 2026-05-07 · knowledge: 2025-01

$0.250
Input / 1M tokens
$1.50
Output / 1M tokens
1.05M
Context window
66K
Max output

Prices in USD per 1M tokens. Unknown means the provider does not publish per-token pricing.

Capabilities

✓ Tool calling✓ Reasoning✓ Structured output✓ Attachments✗ Open weights✓ Temperature control
Modalities: input text, image, video, audio, pdf · output text

Model fit scores

0–100 · higher is better

These scores reward declared capabilities, context size, price and provider availability — they are not benchmark results. Use them as a directional signal alongside your own evaluation.

Coding96
  • Tool calling40/40
  • Structured output20/20
  • Reasoning10/10
  • Context window (100K → 1M)20/20
  • Provider availability6/10
Agents96
  • Tool calling35/35
  • Structured output25/25
  • Reasoning15/15
  • Output token limit15/15
  • Provider availability6/10
JSON / structured output97
  • Structured output / JSON mode50/50
  • Tool calling20/20
  • Temperature control10/10
  • Price-friendly for high-volume17/20
Cost efficiency61
  • Headline price (log-scaled)56/95
  • Has prompt-cache pricing5/5
Long context91
  • Context window (100K → 2M)81/90
  • Has published price for full window10/10
Vision96
  • Accepts image input50/50
  • Context window (10K → 1M)30/30
  • Has published price10/10
  • Provider availability6/10
Production-readiness84
  • Number of independent providers30/40
  • Has published per-token price20/20
  • Context window ≥ 8K15/15
  • No data inconsistencies across providers4/10
  • Official model (not derivative)15/15

Cost Efficiency Index

Open full calculator →

Estimated cost using the recommended provider's headline rate. Each scenario fixes average input/output tokens — the assumptions are shown in the third column.

ScenarioCostAssumption
RAG answer
per 1,000 RAG answers
$2.00
< $0.01 per request
5K input tokens (query + 4 retrieved chunks of ~1K each) and a 500-token answer. Typical SaaS knowledge-base bot.
Support ticket triage
per 10,000 tickets
$4.00
< $0.01 per request
1K input tokens (ticket body + system prompt) and a 100-token JSON classification reply. High-volume customer support.
Data extraction
per 1,000 documents
$1.25
< $0.01 per request
2K input tokens (a single document page) and a 500-token JSON extraction. ETL / invoice / form pipelines.
Code review
per 1,000 PRs
$3.50
< $0.01 per request
8K input tokens (diff + surrounding files) and a 1K-token review comment. PR-bot workloads.
Agent step
per 1,000 steps
$3.90
< $0.01 per request
12K input tokens (long-running tool history) and a 600-token tool-call decision. Cost per agent step.

Pricing detail

Recommended pricing from google · gemini-3.1-flash-lite

$0.250
Input
$1.50
Output
$0.025
Cache read
$1.00
Cache write

Available on 6 providers

ProviderProvider model idInput / 1MOutput / 1MContextReleased
Google
google
gemini-3.1-flash-lite$0.250$1.501.05M2026-05-07
Vertex
google-vertex
gemini-3.1-flash-lite$0.250$1.501.05M2026-05-07
Vercel AI Gateway
vercel
google/gemini-3.1-flash-lite$0.250$1.501M2026-05-07
Poe
poe
google/gemini-3.1-flash-lite$0.250$1.501.05M2026-02-18
AIHubMix
aihubmix
gemini-3.1-flash-lite$0.250$1.501.05M2026-03-03
LLM Gateway
llmgateway
gemini-3.1-flash-lite$0.250$1.501.05M2026-05-07

Data inconsistencies across providers

  • context_window varies: 1000000, 1048576
  • release_date varies (span 78d): 2026-02-18, 2026-03-03, 2026-05-07
  • modalities varies across offerings

Different providers report different values for this model. Quick facts above use the representative provider; consult the table for per-provider truth.

Frequently asked questions

How much does Gemini 3.1 Flash Lite cost?

Gemini 3.1 Flash Lite costs $0.250 per 1M input tokens and $1.50 per 1M output tokens, sourced from google. Cache reads, audio tokens and >200K-context tiers (where applicable) are listed in the Pricing detail block above.

What is the context window of Gemini 3.1 Flash Lite?

Gemini 3.1 Flash Lite has a context window of 1.05M tokens, with a max output of 66K tokens per reply. This is the total combined size of prompt + completion.

Does Gemini 3.1 Flash Lite support tool calling?

Yes. Gemini 3.1 Flash Lite supports tool calling (function calling). This makes it suitable for production agent and automation workloads where the model has to invoke external functions reliably.

Does Gemini 3.1 Flash Lite support structured output / JSON mode?

Yes. Gemini 3.1 Flash Lite supports structured output / JSON-schema-constrained decoding. This makes it suitable for production agent and automation workloads where the model has to invoke external functions reliably.

Can Gemini 3.1 Flash Lite accept image input?

Yes. Gemini 3.1 Flash Lite accepts both text and image input. Vision pricing per image is usually billed on top of the regular token rate — check Google's docs for the exact rule.

Is Gemini 3.1 Flash Lite open-weight?

No. Gemini 3.1 Flash Lite is a proprietary model — only Google (and any approved hosting partners) can serve it. The pricing above reflects the cheapest API access.

What are the best alternatives to Gemini 3.1 Flash Lite?

If Gemini 3.1 Flash Lite doesn't fit, consider Gemini 2.5 Pro, Gemini 2.5 Flash, Gemini 3 Flash Preview. Each one targets the same use case — see the Related links below for direct head-to-head pages.

Where does this data come from?

All numbers come from the public models.dev API and are normalised into a single canonical model record. We re-pull daily and write any changes (price, context, capability) to the /changelog page.

Explore more

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Capability lists this model is in

See also

Last updated:

Data is sourced from models.dev and normalized for comparison. Prices and capabilities may change. Always verify critical production decisions with the provider's official documentation.