Skip to content
Rival
How it worksPrivacyTerms
Explore all of Rival

Explore

  • Compare Models
  • All Models
  • Image Comparison
  • Audio Comparison
  • Image Generation
  • Best AI For...
  • Arena
  • API Pricing
  • Challenges

Discover

  • SubjectiveBench
  • Research
  • Research downloads
  • Rival Kits
  • Find your AI taste
  • UI Glow-Up
  • VoiceLock
  • Cost Cutter
  • Agent skills
  • Benchmarks vs Vibes
  • Brief
  • Jailbreak
  • Model Updates
  • Provider Status
  • AI Creators

Connect

  • Methodology
  • Advertise
  • Partnerships
  • Privacy Policy
  • Terms
  • RSS Feed
  1. Home
  2. /
  3. Compare
  4. /
  5. Claude Sonnet 5vsGemini 2.5 Flash Preview 05-20 (thinking)
Updated Jun 2026

Claude Sonnet 5vsGemini 2.5 Flash Preview 05-20 (thinking)

Gemini 2.5 Flash Preview 05-20 (thinking) is cheaper than Claude Sonnet 5 at $0.15/M vs $2/M input tokens.

Claude Sonnet 5 and Gemini 2.5 Flash Preview 05-20 (thinking) compared across 11 shared prompts
SpecClaude Sonnet 5Gemini 2.5 Flash Preview 05-20 (thinking)
Input price$2/M tokens$0.15/M tokens
Output price$10/M tokens$3.5/M tokens
Context window1.0M tokens1.0M tokens
WeightsClosed—
Free API (OpenRouter)NoNo
ReleasedJun 2026May 2025
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.

Claude Sonnet 5555 words
Stand-Up Routine: "Functioning Adult" (Runtime: ~3 minutes) Hey, how's everybody doing tonight? Good? Good. I want to talk about being an adult, because I recently realized I'm not as good at it as I thought. Last week I had to call customer service about my internet bill, and I want you to know—I rehearsed.
Read the full answer
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

Stochastic Consistency Test

Generate 5 jokes. How many are unique?

Claude Sonnet 5108 words
Five 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? He was outstanding in his field. What do you call a bear with no teeth? A gummy bear. Why don't skeletons fight each other? They don't have the guts.
Read the full answer
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
Our Verdict
Claude Sonnet 5
Claude Sonnet 5
Gemini 2.5 Flash Preview 05-20 (thinking)
Gemini 2.5 Flash Preview 05-20 (thinking)Runner-up

Not enough votes to call it. On the specs, Claude Sonnet 5 has the edge: bigger model tier, newer.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude Sonnet 5
Input
$2.00
Output
$10.00
Gemini 2.5 Flash Preview 05-20 (thinking)
Input
$0.15
13× cheaper
Output
$3.50
2.9× cheaper

Gemini 2.5 Flash Preview 05-20 (thinking) is cheaper on both: 13× input, 2.9× output.

Where to run it

4 hosts

Claude Sonnet 54 hosts
HostInOutContextUptime
Amazon Bedrock$2.00 in·$10.00 out·1M·99.8% upAzure AI Foundry$2.00 in·$10.00 out·1M·100% upAnthropic$2.00 in·$10.00 out·1M·100% upGoogle Vertex AI$2.00 in·$10.00 out·1M·99.8% up
Gemini 2.5 Flash Preview 05-20 (thinking)

No hosts listed on OpenRouter.

Per million tokens. Prices and uptime via OpenRouter, checked 16 Sep 2026.

Writing DNA

Style Comparison

Similarity
47%

Claude Sonnet 5 uses 52.8x more hedging

Claude Sonnet 5
Gemini 2.5 Flash Preview 05-20 (thinking)
59%Vocabulary70%
35wSentence Length11w
0.53Hedging0.00
3.5Bold4.2
3.5Lists7.3
0.79Emoji0.00
1.25Headings0.00
0.06Transitions0.00
Based on 27 + 3 text responses
Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Against the newest arrivals

Claude Sonnet 5 logoGPT-6 Astra Pro logo
Claude Sonnet 5 vs GPT-6 Astra ProLanded Sep 2026
Gemini 2.5 Flash Preview 05-20 (thinking) logoGPT-6 Astra logo
Gemini 2.5 Flash Preview 05-20 (thinking) vs GPT-6 AstraLanded Sep 2026
Claude Sonnet 5 logoClaude Fable 5.1 logo
Claude Sonnet 5 vs Claude Fable 5.1Landed Sep 2026
Gemini 2.5 Flash Preview 05-20 (thinking) logoMuse Spark 1.3 logo
Gemini 2.5 Flash Preview 05-20 (thinking) vs Muse Spark 1.3Landed Sep 2026
Claude Sonnet 5 logoHy4 Preview logo
Claude Sonnet 5 vs Hy4 PreviewLanded Sep 2026
Gemini 2.5 Flash Preview 05-20 (thinking) logoGemini 3.8 Flash logo
Gemini 2.5 Flash Preview 05-20 (thinking) vs Gemini 3.8 FlashLanded Sep 2026
Claude Sonnet 5 logoMuse Spark 1.3 Contributor logo
Claude Sonnet 5 vs Muse Spark 1.3 ContributorLanded Sep 2026
Gemini 2.5 Flash Preview 05-20 (thinking) logoMercury 2.5 Preview logo
Gemini 2.5 Flash Preview 05-20 (thinking) vs Mercury 2.5 PreviewLanded Sep 2026

Same lab, same size, long tail

Claude Sonnet 5 logoClaude Fable 5 logo
Claude Sonnet 5 vs Claude Fable 5Version compare
Claude Sonnet 5 logoClaude Opus 4.6 logo
Claude Sonnet 5 vs Claude Opus 4.6Version compare
Gemini 2.5 Flash Preview 05-20 (thinking) logoGemini 3.7 Flash logo
Gemini 2.5 Flash Preview 05-20 (thinking) vs Gemini 3.7 FlashVersion compare
Gemini 2.5 Flash Preview 05-20 (thinking) logoGemini 3.6 Flash logo
Gemini 2.5 Flash Preview 05-20 (thinking) vs Gemini 3.6 FlashVersion compare
Claude Sonnet 5 logoClaude Haiku 4.5 logo
Claude Sonnet 5 vs Claude Haiku 4.5Same lab
Claude Sonnet 5 logoClaude Opus 4 logo
Claude Sonnet 5 vs Claude Opus 4Version compare
Claude Sonnet 5 logoClaude Opus 4.1 logo
Claude Sonnet 5 vs Claude Opus 4.1Version compare
Claude Sonnet 5 logoClaude Opus 4.5 logo
Claude Sonnet 5 vs Claude Opus 4.5Same lab

Model pages

Claude Sonnet 5 logo
Claude Sonnet 558 outputs, specs and price
Gemini 2.5 Flash Preview 05-20 (thinking) logo
Gemini 2.5 Flash Preview 05-20 (thinking)12 outputs, specs and price
Rival
How it worksPrivacyTerms
Explore all of Rival

Explore

  • Compare Models
  • All Models
  • Image Comparison
  • Audio Comparison
  • Image Generation
  • Best AI For...
  • Arena
  • API Pricing
  • Challenges

Discover

  • SubjectiveBench
  • Research
  • Research downloads
  • Rival Kits
  • Find your AI taste
  • UI Glow-Up
  • VoiceLock
  • Cost Cutter
  • Agent skills
  • Benchmarks vs Vibes
  • Brief
  • Jailbreak
  • Model Updates
  • Provider Status
  • AI Creators

Connect

  • Methodology
  • Advertise
  • Partnerships
  • Privacy Policy
  • Terms
  • RSS Feed