Chat with Gemini 3.1 Flash Lite for free: Fast

Live preview

See how Gemini 3.1 Flash Lite thinks

Pick a task and watch a sample answer stream in. Open the same prompt in Chatday when you’re ready.

Why does this return undefined? const u = users.find(u => u.id = id)

The bug is in the arrow body: u.id = id assigns instead of compares, so the callback returns the assigned value and .find never matches the way you expect.

Fix it with a strict comparison:

const u = users.find(u => u.id === id);

Use === to compare. A single = is assignment, which is why you saw undefined.

Illustrative preview: your real answers run in Chatday. Continue in Chatday

Strengths

What makes Gemini 3.1 Flash Lite stand out

Ultra-fast inference

Very low cost

High-throughput friendly

At a glance

Gemini 3.1 Flash Lite specifications

1M

Context window

65K

Max output

Text · Vision · Code

Modality

Fast

Speed

Free & Pro

Available in Chatday

Provider	Google
Model family	Gemini 3 series
Context window	1,000,000 tokens
Max output	65,000 tokens
Modality	Text · Vision · Code
Input price	$0.25 / 1M tokens
Output price	$1.5 / 1M tokens
Tool / function calling	Yes
Vision	Yes
Streaming	Yes
Available in Chatday	Free & Pro

Pricing shown for reference; usage is included in your Chatday plan.

Side by side

Gemini 3.1 Flash Lite vs other top models

Compare

Model	Context	Best at	Input price	In Chatday
Gemini 3.1 Flash Lite	1M	Fast	$0.25/M	Free
Grok 4.6	500K	Agentic reasoning	$2/M	Free
Claude Opus 5	1M	Frontier agents	$5/M	Free
GPT-5.6	1.1M	Flagship reasoning	$2/M	Free

FAQ

Gemini 3.1 Flash Lite questions

Yes. Gemini 3.1 Flash Lite is available on the free plan with daily limits. Pro raises the limits and adds priority access during peak times.

1M tokens: enough for very long documents, large codebases or extended conversations without losing earlier context.

Reach for Gemini 3.1 Flash Lite on the tasks it’s built for, then switch models mid-chat in Chatday when another one fits better, no need to leave the conversation.

Yes. Gemini 3.1 Flash Lite accepts image input, so you can share screenshots, diagrams and photos and ask it to reason over them.