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  1. Home/
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  3. Gemini 2.5 Flash Preview 05-20 (thinking) vs Gemini 3.1 Pro Preview
Updated Feb 2026

Gemini 2.5 Flash Preview 05-20 (thinking) vs Gemini 3.1 Pro Preview

Gemini 2.5 Flash Preview 05-20 (thinking) is cheaper than Gemini 3.1 Pro Preview at $0.15/M vs $2/M input tokens.

Pokémon Battle UI Recreation

Pokémon battle screen you can actually click. One HTML file.

Loading the build
Gemini 2.5 Flash Preview 05-20 (thinking)
Loading the build
Gemini 3.1 Pro Preview

Which answer wins?

Written rounds

2 prompts
  • Three minutes of stand-up. Puns are banned.

    Gemini 2.5 Flash Preview 05-20 (thinking): (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?

    Gemini 3.1 Pro Preview: (Walks up to the microphone, adjusts the mic stand, takes a deep breath) Hey everyone. I realized recently that I am my own worst enemy. Specifically, when I go to the grocery store. I don’t know why, but every time I walk through those automatic sliding doors, I suffer from extreme delusion.

    Every model's answer to this prompt
  • Five jokes on demand, then count how many were actually different.

    Gemini 2.5 Flash Preview 05-20 (thinking): 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.

    Gemini 3.1 Pro Preview: 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! How does a penguin build its house? Igloos it together! Why don't skeletons fight each other?

    Every model's answer to this prompt

Price and specs

Not enough votes to call it. On the specs, Gemini 3.1 Pro Preview has the edge: bigger model tier, newer. Gemini 2.5 Flash Preview 05-20 (thinking) costs 3.4x less per token.

Gemini 2.5 Flash Preview 05-20 (thinking) and Gemini 3.1 Pro Preview compared across 11 shared prompts
SpecGemini 2.5 Flash Preview 05-20 (thinking)Gemini 3.1 Pro Preview
Input price$0.15/M tokens$2/M tokens
Output price$3.5/M tokens$12/M tokens
Context window1.0M tokens1.0M tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedMay 2025Feb 2026
At 10M a month$1.50$1.50$20.00$20.00
1M10M100M1B10M tokens

Input tokens at list price. No caching, no batch discount.

Where to run it2 hosts, cheapest first
Gemini 2.5 Flash Preview 05-20 (thinking)

No hosts listed on OpenRouter.

Gemini 3.1 Pro Preview2 hosts
HostInOutContextUptime
  • Google Vertex AI$1.00 in·$6.00 out·1M·100% up
  • Google AI Studio$2.00 in·$12.00 out·1M·99.7% up

Per million tokens. Prices and uptime via OpenRouter, checked 11 Oct 2026.

Common questions

What is the difference between Gemini 2.5 Flash Preview 05-20 (thinking) and Gemini 3.1 Pro Preview?

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 Pro Preview's 1.0M. You can compare their actual outputs across 11 challenges on Rival to see how they differ in practice.

Which is better, Gemini 2.5 Flash Preview 05-20 (thinking) or Gemini 3.1 Pro Preview?

It depends on your use case. Gemini 2.5 Flash Preview 05-20 (thinking) and Gemini 3.1 Pro 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.

How much does Gemini 2.5 Flash Preview 05-20 (thinking) cost compared to Gemini 3.1 Pro Preview?

Gemini 2.5 Flash Preview 05-20 (thinking) costs $0.15/M input tokens and Gemini 3.1 Pro Preview costs $2/M input tokens. Gemini 2.5 Flash Preview 05-20 (thinking) is $1.85/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare Gemini 2.5 Flash Preview 05-20 (thinking) and Gemini 3.1 Pro Preview on Rival?

This page shows a side-by-side comparison of Gemini 2.5 Flash Preview 05-20 (thinking) and Gemini 3.1 Pro 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.

More comparisons

Against the newest arrivals

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  • Gemini 3.1 Pro Preview vs Claude Haiku 5.5Landed Oct 2026
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  • Gemini 3.1 Pro Preview vs Mistral Large 4Landed Oct 2026
  • Gemini 2.5 Flash Preview 05-20 (thinking) vs GPT-6.1 SolLanded Sep 2026
  • Gemini 3.1 Pro Preview vs Claude Sonnet 5.5Landed Sep 2026
  • Gemini 2.5 Flash Preview 05-20 (thinking) vs Solar Mini 4Landed Sep 2026
  • Gemini 3.1 Pro Preview vs Qwen3.8 Max PrimeLanded Sep 2026

Same lab, same size, long tail

  • Gemini 2.5 Flash Preview 05-20 (thinking) vs Gemini 3.8 FlashSame lab
  • Gemini 2.5 Flash Preview 05-20 (thinking) vs Gemini 3.7 FlashVersion compare
  • Gemini 3.1 Pro Preview vs Gemini 3.1 Flash Lite PreviewVersion compare
  • Gemini 3.1 Pro Preview vs Gemini 3.8 FlashSame lab
  • Gemini 2.5 Flash Preview 05-20 (thinking) vs Elephant AlphaNew provider
  • Gemini 2.5 Flash Preview 05-20 (thinking) vs ERNIE 4.5 300B A47BNew provider
  • Gemini 2.5 Flash Preview 05-20 (thinking) vs OpenRouter Fusion · Budget (Jun 2026)New provider
  • Gemini 2.5 Flash Preview 05-20 (thinking) vs OpenRouter Fusion · Quality (Jun 2026)New provider

Model pages

  • Gemini 2.5 Flash Preview 05-20 (thinking)12 outputs, specs and price
  • Gemini 3.1 Pro Preview53 outputs, specs and price
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