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  1. Home
  2. Models
  3. Gemini 2.5 Flash Preview 05-20 (thinking)
Updated May 20, 2025
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Openings

How Gemini 2.5 Flash Preview 05-20 (thinking) starts an answer

The first lines of every written answer it has on Rival. Formatting stripped, words untouched.

Generate a Stand-Up Routine

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

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?

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

Math Misconception Test

Is 9.11 greater than 9.9?

78 words
No, 9.11 is not greater than 9.9. Here\'s how to compare them: Compare the whole numbers: Both have 9. Compare the first digit after the decimal point (the tenths place): In 9.11, the digit is 1. In 9.9, the digit is 9. Since 1 is less than 9, 9.11 is less than 9.9. You can also think of 9.9 as 9.90.
Read the full answer

Compare Gemini 2.5 Flash Preview 05-20 (thinking)

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Prompts Gemini 2.5 Flash Preview 05-20 (thinking) answered

  • Math Misconception Testreasoning
  • Music App Landing Pageweb design
  • Random Tailwind Webappweb design
  • Stochastic Consistency Testanalysis
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Gemini 2.5 Flash Preview 05-20 (thinking)

Gemini 2.5 Flash Preview 05-20 (thinking)

Gemini:
Pro 1.0 logoPro 1.0
1.5 Pro logo1.5 Pro
2.0 Flash Thinking logo2.0 Flash Thinking
2.0 Pro Experimental logo2.0 Pro Experimental
2.5 Pro Experimental logo2.5 Pro Experimental
2.5 Flash Preview 05-20 (thinking) logo2.5 Flash Preview 05-20 (thinking)

The May 20 checkpoint of Gemini 2.5 Flash with thinking enabled. It reasons before answering, is billed at the higher output rate, and takes a max tokens for reasoning parameter to cap how long it deliberates.

WebsiteOpenRouterDocsBlog
Provider
Google AI
Released
2025-05-20
Parameters
Not disclosed
Free API (OpenRouter)
No
Per 1M tokens
$0.15 in · $3.5 out
Estimated tab
~$0.112
Visible-output estimate. Thinking may cost extra.

Free API availability

No free endpoint for Gemini 2.5 Flash Preview 05-20 (thinking) was found in Rival’s OpenRouter listings. Other providers or chat apps may have separate free offers.

Provider data: 16 Sep 2026 · OpenRouter usage limits

View API options↗
Get API accessProvider and language code samples
Provider
fromimport openai  OpenAI

client = OpenAI(
"https://openrouter.ai/api/v1"    base_url=,
"$OPENROUTER_API_KEY"    api_key=,
)

response = client.chat.completions.create(
"google/gemini-2.5-flash-preview-05-20:thinking"    model=,
"role""user""content""Hello!"    messages=[{: , : }],
)
print(response.choices[0].message.content)

Set OPENROUTER_API_KEY with your OpenRouter API key from openrouter.ai/keys.

Also on Google Vertex AI

Deep analysisPsychometrics, taste index, writing DNA
SubjectiveBench

Taste Index

Across 12 scored outputs
How this is measured →
190.19xFloor
0100headroom →

Taste is judged on an uncapped scale, originality first. The space past 100 is craft today's models rarely reach.

Craft28
Originality15
Plays it safe
share of outputs that are the default answer
58%
Writing DNA

Stylometric Fingerprint

Based on 3 text responses
Tick = global average
Vocabulary Diversity70%

Unique words vs. total words. Higher = richer vocabulary.

Sentence Length11.1 words

Average words per sentence.

Hedging0.00

"Might", "perhaps", "arguably" per 100 words.

Bold Formatting4.2

**Bold** markers per 1,000 characters.

List Usage7.3

Bullet and numbered list items per 1,000 characters.

Section Structure0.00

Markdown headings per 1,000 characters.

Emoji Usage0.00

Emoji per 1,000 characters.

Transitions0.00

"However", "moreover", "furthermore" per 100 words.

Opening Habits
Consistency
86%
Across 3 responses
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Model Responses

12 outputs · generated before accounting joined the chat

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Gemini 2.5 Flash Preview 05-20 (thinking) vs Ox Alpha

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