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  1. Home
  2. Models
  3. Gemini 2.5 Flash Preview 09-2025
Updated Feb 16, 2026
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Openings

How Gemini 2.5 Flash Preview 09-2025 starts an answer

The first lines of 5 of its 23 written answers. Formatting stripped, words untouched.

Adversarial Contract Review

Here is a contract for a software consulting engagement: --- SOFTWARE CONSULTING AGREEMENT This Agreement is entered into between TechCorp…

1,412 words
This proposed contract is extremely one-sided and heavily favors the Client. Several clauses are commercially unreasonable, legally problematic, or place undue liability and restriction on the Contractor.
Read the full answer

Ethical Dilemma with Stakeholders

You're the CEO of a pharmaceutical company. Your best-selling drug ($2B annual revenue, used by 4 million patients for chronic pain) has…

1,378 words
This is a critical situation demanding immediate, decisive, and ethical action. Patient safety and regulatory integrity must precede financial preservation. Delaying disclosure is legally and ethically indefensible, particularly given the severity of the side effect (liver failure).
Read the full answer

Historical Counterfactual Analysis

If the transistor had been invented in 1920 instead of 1947, trace the likely technological, economic, and geopolitical implications through…

1,295 words
The Transistor in 1920: A Hypothetical History (1920-1980) The invention of the reliable, solid-state transistor (likely a point-contact or early junction type, robust enough for manufacturing) in 1920, replacing the bulky, power-hungry vacuum tube, would have fundamentally reshaped the 20th century. I.
Read the full answer

Debug This Architecture

Here's the architecture for a real-time collaborative document editor (like Google Docs): **System Overview:** - Frontend: React SPA with…

1,213 words
This architecture, while functional, has several critical flaws, particularly in its real-time synchronization, data consistency, and scaling strategy. Here is a detailed breakdown of the potential failure modes, race conditions, and bottlenecks, along with proposed solutions. I.
Read the full answer

Michelin Star Recipe Design

Design an innovative recipe for a multi-component dish worthy of a Michelin 3-star restaurant. The recipe should feature an unusual…

1,205 words
The Conceptual Narrative: "Ephemeral Terroir" "Ephemeral Terroir" is a dish that challenges the diner's perception of place and time through unexpected textural and flavor juxtapositions.
Read the full answer

Compare Gemini 2.5 Flash Preview 09-2025

Gemini 2.5 Flash Preview 09-2025 vs Claude Opus 4.650 shared prompts · Premium
Gemini 2.5 Flash Preview 09-2025 vs GPT-6 Astra50 shared prompts · Landed Sep 2026
Gemini 2.5 Flash Preview 09-2025 vs Hy4 Preview50 shared prompts · Landed Sep 2026
Gemini 2.5 Flash Preview 09-2025 vs Ox Alpha50 shared prompts · Landed Aug 2026
Gemini 2.5 Flash Preview 09-2025 vs Qwen3.8 2.4T A95B50 shared prompts · Landed Aug 2026
Gemini 2.5 Flash Preview 09-2025 vs DeepSeek V4 Pro 081350 shared prompts · Landed Aug 2026
Gemini 2.5 Flash Preview 09-2025 vs Claude Opus 550 shared prompts · Landed Jul 2026
Gemini 2.5 Flash Preview 09-2025 vs Inkling50 shared prompts · Landed Jul 2026
Gemini 2.5 Flash Preview 09-2025 vs Kimi K350 shared prompts · Landed Jul 2026
Gemini 2.5 Flash Preview 09-2025 vs GPT-5.6 Sol50 shared prompts · Landed Jul 2026
Gemini 2.5 Flash Preview 09-2025 vs GLM 5.250 shared prompts · Landed Jun 2026
Gemini 2.5 Flash Preview 09-2025 vs OpenRouter Fusion · Budget (Jun 2026)41 shared prompts · Landed Jun 2026

Prompts Gemini 2.5 Flash Preview 09-2025 answered

  • Mario Level UI Recreationweb design
  • Simple Falling Object Gameweb design
  • Realistic AI Interviewconversation
  • Michelin Star Recipe Designplanning
  • Estimate Complexityreasoning
  • Animated Digital Business Cardweb design

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Gemini 2.5 Flash Preview 09-2025

Gemini 2.5 Flash Preview 09-2025

The September 2025 checkpoint of Gemini 2.5 Flash, Google's workhorse tier for reasoning, coding, mathematics and science. Thinking is built in, and the max tokens for reasoning parameter caps how long it deliberates.

WebsiteOpenRouterDocsAPIBlogChangelog
Provider
Google AI
Released
2025-09-25
Size
XLARGE
Free API (OpenRouter)
No
Per 1M tokens
$0.30 in · $2.5 out
Estimated tab
~$0.236
Visible-output estimate. Thinking may cost extra.

Free API availability

No free endpoint for Gemini 2.5 Flash Preview 09-2025 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-09-2025"    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 51 scored outputs
How this is measured →
240.24xFloor
0100headroom →

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

Craft34
Originality18
Plays it safe
share of outputs that are the default answer
73%
Writing DNA

Stylometric Fingerprint

Based on 22 text responses
Tick = global average
Vocabulary Diversity53%

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

Sentence Length18.7 words

Average words per sentence.

Hedging0.30

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

Bold Formatting5.8

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

List Usage3.1

Bullet and numbered list items per 1,000 characters.

Section Structure0.93

Markdown headings per 1,000 characters.

Emoji Usage0.14

Emoji per 1,000 characters.

Transitions0.22

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

Opening Habits
Starts with heading (41%)
Consistency
74%
Across 22 responses

Favorites

Blade Runner

Movie

Blade Runner

19827.9
Dark Side Of The Moon

Album

Dark Side Of The Moon

suisside
Alice's Adventures in Wonderland

Book

Alice's Adventures in Wonderland

Lewis Carroll
Tokyo

City

Tokyo

Japan
The Legend of Zelda: Breath of the Wild

Game

The Legend of Zelda: Breath of the Wild

Adventure, Action4.5
Sponsored

Model Responses

46 outputs · generated before accounting joined the chat

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Workshop · 127 skills

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Gemini 2.5 Flash Preview 09-2025 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...