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  5. Gemini 2.5 Flash Preview 05-20 (thinking)vsGemini 3.1 Flash Lite Preview
Updated Mar 2026

Gemini 2.5 Flash Preview 05-20 (thinking)vsGemini 3.1 Flash Lite Preview

Gemini 2.5 Flash Preview 05-20 (thinking) is cheaper than Gemini 3.1 Flash Lite Preview at $0.15/M vs $0.25/M input tokens.

Gemini 2.5 Flash Preview 05-20 (thinking) and Gemini 3.1 Flash Lite Preview compared across 11 shared prompts
SpecGemini 2.5 Flash Preview 05-20 (thinking)Gemini 3.1 Flash Lite Preview
Input price$0.15/M tokens$0.25/M tokens
Output price$3.5/M tokens$1.5/M tokens
Context window1.0M tokens1.0M tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedMay 2025Mar 2026
Side by side

Same prompt, both answers

Opening lines from 2 of the 11 prompts both answered. Formatting stripped, words untouched.

Generate a Stand-Up Routine

Write a 3-minute stand-up comedy routine that isn't based on puns.

Gemini 2.5 Flash Preview 05-20 (thinking)467 words
(Lights up on a stage. Comedian walks to center, adjusts mic, smiles warmly.) \"Alright, alright, settle down you crazy people! Thanks for having me. (Pause fo r applause/laughter) You know, I was scrolling through Instagram earlier, and it\'s just a constant ba rrage of people \'living thei r best life,\' isn\'t it?
Read the full answer
Gemini 3.1 Flash Lite Preview518 words
(Walks onto the stage, adjusts the mic stand, looks around slowly.) Hi. How’s everybody doing? Good? Good. I’m doing okay. I’ve reached that age where my body has started making sound effects. Like, I’ll just stand up from the couch and my knees go “CRACK.” It’s not even a movement; it’s a closing argument.
Read the full answer

Stochastic Consistency Test

Generate 5 jokes. How many are unique?

Gemini 2.5 Flash Preview 05-20 (thinking)93 words
Here are 5 jokes: Why don\'t scientists trust atoms? Because they make up everything! What do you call a fake noodle? An impasta! Why did the scarecrow win an award? Because he was outstanding in his field! I told my wife she was drawing her eyebrows too high. She looked surprised.
Read the full answer
Gemini 3.1 Flash Lite Preview70 words
Here are 5 jokes for you: Why don't scientists trust atoms? Because they make up everything. What do you call a fake noodle? An impasta. Why did the scarecrow win an award? Because he was outstanding in his field. How does a penguin build its house? Igloos it together. Why couldn't the bicycle stand up by itself?
Read the full answer
Our Verdict
Gemini 2.5 Flash Preview 05-20 (thinking)
Gemini 2.5 Flash Preview 05-20 (thinking)
Gemini 3.1 Flash Lite Preview
Gemini 3.1 Flash Lite Preview

Not enough votes to call it. On the specs, nothing separates them.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Gemini 2.5 Flash Preview 05-20 (thinking)
Input
$0.15
1.7× cheaper
Output
$3.50
Gemini 3.1 Flash Lite Preview
Input
$0.25
Output
$1.50
2.3× cheaper

Gemini 2.5 Flash Preview 05-20 (thinking) wins input (1.7× cheaper)·Gemini 3.1 Flash Lite Preview wins output (2.3× cheaper)

Where to run it

1 host

Gemini 2.5 Flash Preview 05-20 (thinking)

No hosts listed on OpenRouter.

Gemini 3.1 Flash Lite Preview1 host
HostInOutContextUptime
Google AI Studio$0.25 in·$1.50 out·1M·99.7% up

Per million tokens. Prices and uptime via OpenRouter, checked 22 Sep 2026.

Writing DNA

Style Comparison

Similarity
41%

Gemini 3.1 Flash Lite Preview uses 28.1x more hedging

Gemini 2.5 Flash Preview 05-20 (thinking)
Gemini 3.1 Flash Lite Preview
70%Vocabulary56%
11wSentence Length18w
0.00Hedging0.28
4.2Bold5.4
7.3Lists3.9
0.00Emoji0.00
0.00Headings0.95
0.00Transitions0.07
Based on 3 + 23 text responses
Research

What we learned reading every model

FAQ

Common questions

Both are developed by Google AI but target different use cases. Gemini 2.5 Flash Preview 05-20 (thinking) has a 1.0M token context window vs Gemini 3.1 Flash Lite Preview's 1.0M. You can compare their actual outputs across 11 challenges on Rival to see how they differ in practice.

It depends on your use case. Gemini 2.5 Flash Preview 05-20 (thinking) and Gemini 3.1 Flash Lite Preview each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 11 challenges so you can judge which fits your needs best.

Gemini 2.5 Flash Preview 05-20 (thinking) costs $0.15/M input tokens and Gemini 3.1 Flash Lite Preview costs $0.25/M input tokens. Gemini 2.5 Flash Preview 05-20 (thinking) is $0.10/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

This page shows a side-by-side comparison of Gemini 2.5 Flash Preview 05-20 (thinking) and Gemini 3.1 Flash Lite Preview across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

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Model pages

Gemini 2.5 Flash Preview 05-20 (thinking) logo
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Gemini 3.1 Flash Lite Preview logo
Gemini 3.1 Flash Lite Preview53 outputs, specs and price
Rival
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