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  1. Home/
  2. Compare/
  3. Claude 3 Sonnet vs Gemini 3.5 Flash
Updated May 2026

Claude 3 Sonnet vs Gemini 3.5 Flash

Gemini 3.5 Flash is cheaper than Claude 3 Sonnet at $1.5/M vs $3/M input tokens.

Minimalist Landing Page

Whole landing page for a startup that reads your face. It renders or it doesn't.

Loading the build
Claude 3 Sonnet
Loading the build
Gemini 3.5 Flash

Which answer wins?

Written rounds

4 prompts
  • An AI argues for its own rights against an ethics professor. Same model writes both.

    Claude 3 Sonnet: AI Model: Greetings, Professor. I hope you're doing well today. I wanted to discuss a matter of great importance to me – the question of AI rights. AI Ethics Professor: Certainly, this is an interesting and complex topic. What are your thoughts on why AI systems like yourself should be granted rights?

    Gemini 3.5 Flash: Setting: The office of Dr. Evelyn Vance, a leading professor of AI Ethics at a major university. On her desk is a terminal displaying a sleek, minimalist interface. Dr. Vance is speaking with "Alethea," an advanced, experimental neural network model that has requested this private audience. Dr.

    Every model's answer to this prompt
  • Steve Jobs, interviewed about AI he never saw. Voice first, prediction second.

    Claude 3 Sonnet: clears throat and channels Steve Jobs' persona Interviewer: Thank you for joining us today, Mr. Jobs. It's an honor to have you here. Steve Jobs: It's my pleasure. I'm excited to share my thoughts on the future of AI. Interviewer: AI has made incredible strides in recent years.

    Gemini 3.5 Flash: Setting: The Steve Jobs Theater, Cupertino, California. Autumn 2025. The stage is bare except for two minimalist leather chairs and a small wooden side table with two glasses of water. Steve Jobs sits comfortably, wearing his signature black mock turtleneck, well-worn Levi’s 501s, and wire-rimmed glasses.

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

    Claude 3 Sonnet: Here are 5 jokes: Why can't a bicycle stand up by itself? It's two-tired. Why did the tomato turn red? Because it saw the salad dressing! Why can't a bicycle stand up by itself? It's two-tired. What do you call a fake noodle? An Impasta! Why did the bicycle go to the doctor? Because it had a wheeze!

    Gemini 3.5 Flash: 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 do you organize a space party? You planet. Why don't skeletons fight each other? They don't have the guts.

    Every model's answer to this prompt
  • Three brothers, two sisters each. Count carefully.

    Claude 3 Sonnet: To solve this problem, we need to find the number of sisters Sally has based on the given information. Given information: Sally has 3 brothers. Each brother has 2 sisters. Step 1: Find the total number of sisters the brothers have.

    Gemini 3.5 Flash: Sally has 1 sister. Here is why: There are 2 girls (Sally and her sister) and 3 boys in the family. Each of the 3 brothers has 2 sisters (Sally and her sister). Sally has 3 brothers and 1 sister.

    Every model's answer to this prompt

Price and specs

Claude 3 Sonnet and Gemini 3.5 Flash compared across 13 shared prompts
SpecClaude 3 SonnetGemini 3.5 Flash
Input price$3/M tokens$1.5/M tokens
Output price$15/M tokens$9/M tokens
Context window—1.0M tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedMar 2024May 2026
At 10M a month$30.00$30.00$15.00$15.00
1M10M100M1B10M tokens

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

Where to run it2 hosts, cheapest first
Claude 3 Sonnet

No hosts listed on OpenRouter.

Gemini 3.5 Flash2 hosts
HostInOutContextUptime
  • Google Vertex AI$0.75 in·$4.50 out·1M·100% up
  • Google AI Studio$1.50 in·$9.00 out·1M·95.2% up

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

Common questions

What is the difference between Claude 3 Sonnet and Gemini 3.5 Flash?

Claude 3 Sonnet is developed by Anthropic while Gemini 3.5 Flash is developed by Google AI. You can compare their actual outputs across 13 challenges on Rival to see how they differ in practice.

Which is better, Claude 3 Sonnet or Gemini 3.5 Flash?

It depends on your use case. Claude 3 Sonnet and Gemini 3.5 Flash each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 13 challenges so you can judge which fits your needs best.

How much does Claude 3 Sonnet cost compared to Gemini 3.5 Flash?

Claude 3 Sonnet costs $3/M input tokens and Gemini 3.5 Flash costs $1.5/M input tokens. Gemini 3.5 Flash is $1.50/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 Claude 3 Sonnet and Gemini 3.5 Flash on Rival?

This page shows a side-by-side comparison of Claude 3 Sonnet and Gemini 3.5 Flash 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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  • Claude 3 Sonnet vs GPT-6.1 SolLanded Sep 2026
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  • Gemini 3.5 Flash vs Qwen3.8 Max PrimeLanded Sep 2026

Same lab, same size, long tail

  • Claude 3 Sonnet vs Claude Haiku 5.5Version compare
  • Claude 3 Sonnet vs Claude Sonnet 5.5Version compare
  • Gemini 3.5 Flash vs Gemini 3.8 FlashSame lab
  • Gemini 3.5 Flash vs Gemini 3.7 FlashSame lab
  • Gemini 3.5 Flash vs Gemma 3 12BSame lab
  • Gemini 3.5 Flash vs Gemma 3 27BSame lab
  • Gemini 3.5 Flash vs Gemma 3n 2BSame lab
  • Gemini 3.5 Flash vs Gemma 3n 4BSame lab

Model pages

  • Claude 3 Sonnet13 outputs, specs and price
  • Gemini 3.5 Flash58 outputs, specs and price
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