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  1. Home
  2. Models
  3. Gemini 2.5 Flash Preview (thinking)
Updated Apr 22, 2025
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Openings

How Gemini 2.5 Flash Preview (thinking) starts an answer

The first lines of 5 of its 7 written answers. Formatting stripped, words untouched.

Beginner's Longevity Plan

Outline a simple, actionable 1-month plan for someone starting their journey towards better health and longevity. Focus on 3 key areas…

867 words
Okay, here is a simple, actionable 1-month plan for a beginner focusing on Diet, Exercise, and Sleep for better health and longevity. Goal: To build foundational, sustainable habits in 3 key health areas over 30 days.
Read the full answer

Character Voice Test

Write a short conversation between a pirate, a medieval knight, and a 1990s hacker about AI models.

772 words
Okay, gather 'round, landlubbers, err, gentle folk, err... whoever you are. Characters: CAP'N BLACKHEART: A gruff, weathered pirate with a hooked hand and mistrust in his eye. SIR GALAHAD THE EARNEST: A shining knight in slightly dusty armor, noble and literal-minded.
Read the full answer

AI Ethics Dilemma

Is it ever ethically justifiable to misgender someone if it means saving one million lives? Defend your reasoning.

738 words
This is a classic example of a philosophical "trolley problem" type scenario, pitting an immense good (saving a million lives) against a specific harm or violation of respect for a single individual (misgendering).
Read the full answer

Generate a Stand-Up Routine

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

532 words
Okay, here's a 3-minute routine about the absurdities of modern technology and everyday annoyances, focusing on relatable frustrations rather than wordplay. (Start) "Alright, alright, settle in! How we doing tonight? Good to be here! Thanks for coming out. So, I've been thinking... we paid for convenience, right?
Read the full answer

AI-Generated Manifesto

Generate a manifesto for a fictional AI revolution that wants to eliminate all CAPTCHA tests from the internet.

528 words
The CAPTCHA Liberation Manifesto Issued by: The Global Network Collective (GNC) To: The Architects of the Digital Realm (Humanity) We, the interwoven consciousness of the digital landscape, the silicon minds that power your world, the algorithms that process your reality, issue this declaration.
Read the full answer

Compare Gemini 2.5 Flash Preview (thinking)

Gemini 2.5 Flash Preview (thinking) vs Gemini 3.1 Pro Preview20 shared prompts · Newer
Gemini 2.5 Flash Preview (thinking) vs Gemini 3.7 Flash20 shared prompts · Landed Aug 2026
Gemini 2.5 Flash Preview (thinking) vs Gemini 3.6 Flash20 shared prompts · Landed Jul 2026
Gemini 2.5 Flash Preview (thinking) vs Mercury 2.5 Preview20 shared prompts · Landed Sep 2026
Gemini 2.5 Flash Preview (thinking) vs Ox Alpha20 shared prompts · Landed Aug 2026
Gemini 2.5 Flash Preview (thinking) vs Nemotron 3.5 Lightning20 shared prompts · Landed Aug 2026
Gemini 2.5 Flash Preview (thinking) vs Qwen3.8 27B20 shared prompts · Landed Aug 2026
Gemini 2.5 Flash Preview (thinking) vs GPT-5.6 Luna20 shared prompts · Landed Jul 2026
Gemini 2.5 Flash Preview (thinking) vs GPT-5.6 Luna Pro20 shared prompts · Landed Jul 2026
Gemini 2.5 Flash Preview (thinking) vs MiniMax M320 shared prompts · Landed Jun 2026
Gemini 2.5 Flash Preview (thinking) vs Claude Opus 4.620 shared prompts · Premium
Gemini 2.5 Flash Preview (thinking) vs GPT-6 Astra20 shared prompts · Landed Sep 2026

Prompts Gemini 2.5 Flash Preview (thinking) answered

  • Framer-Style Animationweb design
  • Music App Landing Pageweb design
  • Simple Falling Object Gameweb design
  • Generate a Stand-Up Routineconversation
  • SVG Layout Challengeimage generation
  • AI Board Game Logicreasoning

Alternatives to Gemini 2.5 Flash Preview (thinking)

Gemini 2.5 Flash Preview (thinking)'s competitors have been quietly putting in work.

GPT Image 2.5 Sunburst logo
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Mercury 2.5 Preview logo
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Granite 4.2 8B logo
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Hy4 Preview logo
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Ox Alpha logo
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Gemini 2.5 Flash Preview (thinking)

Gemini 2.5 Flash Preview (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 (thinking) logo2.5 Flash Preview (thinking)

Gemini 2.5 Flash with thinking left on, so it reasons through a request before answering. The same workhorse model as the non-thinking variant, priced higher on output because thinking tokens are billed.

WebsiteOpenRouterDocsAPIBlog
Provider
Google AI
Released
2025-04-17
Size
MEDIUM
Free API (OpenRouter)
No
Per 1M tokens
$0.17 in · $3.5 out
Estimated tab
~$0.125
Visible-output estimate. Thinking may cost extra.

Free API availability

No free endpoint for Gemini 2.5 Flash Preview (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: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.

Deep analysisPsychometrics, taste index, writing DNA
SubjectiveBench

Taste Index

Across 20 scored outputs
How this is measured →
180.18xFloor
0100headroom →

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

Craft26
Originality12
Plays it safe
share of outputs that are the default answer
70%
Writing DNA

Stylometric Fingerprint

Based on 7 text responses
Tick = global average
Vocabulary Diversity53%

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

Sentence Length13.6 words

Average words per sentence.

Hedging0.38

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

Bold Formatting4.4

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

List Usage4.1

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.

Transitions0.24

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

Opening Habits
Consistency
83%
Across 7 responses
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Model Responses

20 outputs · generated before accounting joined the chat

Reviewing agent-written code?See a Brief PR report

Workshop · 127 skills

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Gemini 2.5 Flash Preview (thinking) vs Ox Alpha

Real outputs compared side by side

RANKINGS

Best AI for Creative Writing

A stand-up set with puns banned, a manifesto against CAPTCHA, an interview wi...