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  1. Home/
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  3. Gemini 2.5 Flash Preview 05-20 (thinking) vs Grok 4.20 Beta
Updated Mar 2026

Gemini 2.5 Flash Preview 05-20 (thinking) vs Grok 4.20 Beta

Gemini 2.5 Flash Preview 05-20 (thinking) is cheaper than Grok 4.20 Beta 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
Grok 4.20 Beta

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?

    Grok 4.20 Beta: Stand-up Routine: "Adulting is a Scam" (Lights up. Comedian walks out with a coffee cup, takes a sip, immediately looks disappointed.) You ever notice how nobody warns you that being an adult is just childhood with bills and worse snacks?

    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.

    Grok 4.20 Beta: Here are 5 jokes: Why don't skeletons fight each other? They don't have the guts. Why did the scarecrow win an award? He was outstanding in his field. Why don't eggs tell jokes? They'd crack each other up. Why did the bicycle fall over? It was two tired. Why did the math book look sad? Because it had too many problems.

    Every model's answer to this prompt

Price and specs

Not enough votes to call it. On the specs, Grok 4.20 Beta has the edge: bigger model tier, newer, bigger context window.

Gemini 2.5 Flash Preview 05-20 (thinking) and Grok 4.20 Beta compared across 11 shared prompts
SpecGemini 2.5 Flash Preview 05-20 (thinking)Grok 4.20 Beta
Input price$0.15/M tokens$2/M tokens
Output price$3.5/M tokens$6/M tokens
Context window1.0M tokens2.0M tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedMay 2025Mar 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 it1 host
Gemini 2.5 Flash Preview 05-20 (thinking)

No hosts listed on OpenRouter.

Grok 4.20 Beta1 host
HostInOutContextUptime
  • xAI$2.50 in·$5.00 out·2M·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 10 Oct 2026.

Common questions

What is the difference between Gemini 2.5 Flash Preview 05-20 (thinking) and Grok 4.20 Beta?

Gemini 2.5 Flash Preview 05-20 (thinking) is developed by Google AI while Grok 4.20 Beta is developed by xAI. Gemini 2.5 Flash Preview 05-20 (thinking) has a 1.0M token context window vs Grok 4.20 Beta's 2.0M. 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 Grok 4.20 Beta?

It depends on your use case. Gemini 2.5 Flash Preview 05-20 (thinking) and Grok 4.20 Beta 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 Grok 4.20 Beta?

Gemini 2.5 Flash Preview 05-20 (thinking) costs $0.15/M input tokens and Grok 4.20 Beta 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 Grok 4.20 Beta on Rival?

This page shows a side-by-side comparison of Gemini 2.5 Flash Preview 05-20 (thinking) and Grok 4.20 Beta 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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  • Grok 4.20 Beta vs Mistral Large 4Landed Oct 2026
  • Gemini 2.5 Flash Preview 05-20 (thinking) vs GPT-6.1 SolLanded Sep 2026
  • Grok 4.20 Beta vs Claude Sonnet 5.5Landed Sep 2026
  • Gemini 2.5 Flash Preview 05-20 (thinking) vs Solar Mini 4Landed Sep 2026
  • Grok 4.20 Beta 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
  • Grok 4.20 Beta vs Grok 4.20 Multi-Agent BetaVersion compare
  • Grok 4.20 Beta vs Grok 4.7Same lab
  • Gemini 2.5 Flash Preview 05-20 (thinking) vs Qwen3.6 FlashSame size
  • Gemini 2.5 Flash Preview 05-20 (thinking) vs Qwen3.6 Max PreviewNew provider
  • Gemini 2.5 Flash Preview 05-20 (thinking) vs Qwen3.6 Plus Preview (free)New provider
  • Gemini 2.5 Flash Preview 05-20 (thinking) vs Qwen3.7 FlashNew provider

Model pages

  • Gemini 2.5 Flash Preview 05-20 (thinking)12 outputs, specs and price
  • Grok 4.20 Beta53 outputs, specs and price
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