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Gemini 3.1 Flash-Lite vs Gemini 3.5 Flash-Lite

Gemini 3.1 Flash-Lite and Gemini 3.5 Flash-Lite are closely matched at 30.9 and 29.9 on the LLM Stats Score. Gemini 3.1 Flash-Lite is 1.5x cheaper per token.

Google · Google · Updated for 2026

Which is better?

Gemini 3.1 Flash-Lite and Gemini 3.5 Flash-Lite are closely matched on the overall LLM Stats Score at 30.9 and 29.9.

The models split the 2 individual benchmarks reported for both models evenly.

On price, Gemini 3.1 Flash-Lite is roughly 1.5x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Gemini 3.5 Flash-Lite also accepts a larger context window (1,048,576 input tokens), making it the stronger choice for long documents and large codebases.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Gemini 3.1 Flash-Lite

  • cost matters — it's about 1.5x cheaper per token

Choose Gemini 3.5 Flash-Lite

  • you process long inputs — it offers a 1,048,576 token context window
  • you want the most recent training data — it shipped Jul 2026

At a glance

The differences that matter most.

Gemini 3.1 Flash-Lite
Google
Gemini 3.5 Flash-Lite
Google
Core performance indexes
LLM Stats Score
30.9
#113
29.9
#123
Reasoning
31.3
#108
25.9
#148
Agents
10.9
#113
15.5
#83
Cost, coverage & limits
Benchmark wins
1 of 2
1 of 2
Input price
$0.25 / M
$0.30 / M
Output price
$1.50 / M
$2.50 / M
Context window
1,000,000
1,048,576

Capability indexes

Additional strengths measured across groups of related public benchmarks

2 shared
Index
Gemini 3.1 Flash-Lite
Gemini 3.5 Flash-Lite
Vision
17.9#82
19.5#73
Multimodal
23.0#57
21.9#61
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

11 reported for Gemini 3.1 Flash-Lite · 6 for Gemini 3.5 Flash-Lite

2 shared

Gemini 3.1 Flash-Lite outperforms in 1 benchmarks (MRCR v2 (8-needle)), while Gemini 3.5 Flash-Lite is better at 1 benchmark (CharXiv-R).

Both models are evenly matched across the benchmarks.

Mon Sep 14 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

Gemini 3.1 Flash-Lite costs less

For input processing, Gemini 3.1 Flash-Lite ($0.25/1M tokens) is 1.2x cheaper than Gemini 3.5 Flash-Lite ($0.30/1M tokens).

For output processing, Gemini 3.1 Flash-Lite ($1.50/1M tokens) is 1.7x cheaper than Gemini 3.5 Flash-Lite ($2.50/1M tokens).

In conclusion, Gemini 3.5 Flash-Lite is more expensive than Gemini 3.1 Flash-Lite.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Mon Sep 14 2026 • llm-stats.com
Google
Gemini 3.1 Flash-Lite
Input tokens$0.25
Output tokens$1.50
Best providerDeepinfra
Google
Gemini 3.5 Flash-Lite
Input tokens$0.30
Output tokens$2.50
Best providerGoogle
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Gemini 3.5 Flash-Lite accepts 1,048,576 input tokens compared to Gemini 3.1 Flash-Lite's 1,000,000 tokens. Gemini 3.1 Flash-Lite can generate longer responses up to 1,000,000 tokens, while Gemini 3.5 Flash-Lite is limited to 65,536 tokens.

Google
Gemini 3.1 Flash-Lite
Input1,000,000 tokens
Output1,000,000 tokens
Google
Gemini 3.5 Flash-Lite
Input1,048,576 tokens
Output65,536 tokens
Mon Sep 14 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Gemini 3.1 Flash-Lite and Gemini 3.5 Flash-Lite support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Gemini 3.1 Flash-Lite

Text
Images
Audio
Video

Gemini 3.5 Flash-Lite

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Gemini 3.1 Flash-Lite

Proprietary

Closed source

Gemini 3.5 Flash-Lite

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 3.1 Flash-Lite was released on 2026-03-03, while Gemini 3.5 Flash-Lite was released on 2026-07-21.

Gemini 3.5 Flash-Lite is 5 months newer than Gemini 3.1 Flash-Lite.

Gemini 3.1 Flash-Lite

Mar 3, 2026

6 months ago

Gemini 3.5 Flash-Lite

Jul 21, 2026

1 months ago

4mo newer

Knowledge Cutoff

When training data ends

Gemini 3.1 Flash-Lite has a knowledge cutoff of 2025-01-31, while Gemini 3.5 Flash-Lite has a cutoff of 2026-03-31.

Gemini 3.5 Flash-Lite has more recent training data (up to 2026-03-31), making it potentially better informed about events through that date compared to Gemini 3.1 Flash-Lite (2025-01-31).

Gemini 3.1 Flash-Lite

Jan 2025

Gemini 3.5 Flash-Lite

Mar 2026

1.2 yr newer

Provider Availability

Gemini 3.1 Flash-Lite is available from DeepInfra, Google. Gemini 3.5 Flash-Lite is available from Google.

Gemini 3.1 Flash-Lite

deepinfra logo
Deepinfra
Input Price:Input: $0.25/1MOutput Price:Output: $1.50/1M
google logo
Google
Input Price:Input: $0.25/1MOutput Price:Output: $1.50/1M

Gemini 3.5 Flash-Lite

google logo
Google
Input Price:Input: $0.30/1MOutput Price:Output: $2.50/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Gemini 3.1 Flash-Lite and Gemini 3.5 Flash-Lite side-by-side, then vote on the output you prefer.

Gemini 3.1 Flash-Lite
✓ Preferred
Gemini 3.5 Flash-Lite
Open in Playground

FAQ

Common questions about Gemini 3.1 Flash-Lite vs Gemini 3.5 Flash-Lite.

Which is better, Gemini 3.1 Flash-Lite or Gemini 3.5 Flash-Lite?

Gemini 3.1 Flash-Lite and Gemini 3.5 Flash-Lite are closely matched on the LLM Stats Score at 30.9 and 29.9. Gemini 3.1 Flash-Lite is made by Google and Gemini 3.5 Flash-Lite is made by Google. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Gemini 3.1 Flash-Lite compare to Gemini 3.5 Flash-Lite in benchmarks?

Gemini 3.1 Flash-Lite scores MMMLU: 88.9%, GPQA: 86.9%, VideoMMMU: 84.8%, MMMU-Pro: 76.8%, CharXiv-R: 73.2%. Gemini 3.5 Flash-Lite scores CharXiv-R: 76.5%, OSWorld-Verified: 74.0%, SWE-Bench Pro: 54.2%, Terminal-Bench 2.1: 54.0%, MLE-Bench: 39.2%.

Is Gemini 3.1 Flash-Lite cheaper than Gemini 3.5 Flash-Lite?

Gemini 3.1 Flash-Lite is 1.2x cheaper for input tokens. Gemini 3.1 Flash-Lite costs $0.25/M input and $1.50/M output via deepinfra. Gemini 3.5 Flash-Lite costs $0.30/M input and $2.50/M output via google.

What are the context window sizes for Gemini 3.1 Flash-Lite and Gemini 3.5 Flash-Lite?

Gemini 3.1 Flash-Lite supports 1.0M tokens and Gemini 3.5 Flash-Lite supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Gemini 3.1 Flash-Lite and Gemini 3.5 Flash-Lite?

Key differences include LLM Stats Score (30.9 vs 29.9), context window (1.0M vs 1.0M), input pricing ($0.25 vs $0.30/M). See the full comparison above for benchmark-by-benchmark results.

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