Gemini 2.5 Flash Preview (thinking)

Gemini:

Pro 1.0

2.5 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.

Website OpenRouter Docs API Blog

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: 13 Sep 2026OpenRouter 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

Model Responses

20 outputs · generated before accounting joined the chat

Reviewing agent-written code?See a Brief PR report

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