Gemini 2.5 Pro (I/O Edition)

Google's Gemini 2.5 Pro preview: multimodal understanding, multi-step code, math and STEM, and long-context analysis over large datasets, codebases and documents. Knowledge cutoff January 2025.

Provider: Google AI
Released: 2025-05-06
Parameters: Not disclosed
Free API (OpenRouter): No
Per 1M tokens: $1.25 in · $10 out
Estimated tab: ~$1.08; Visible-output estimate. Thinking may cost extra.

Free API availability

No free endpoint for Gemini 2.5 Pro (I/O Edition) was found in Rival’s OpenRouter listings. Other providers or chat apps may have separate free offers.

Provider data: 9 Sep 2026OpenRouter usage limits

View API options

Get API accessProvider and language code samples

2 hostsInOutContextUptime

Google AI Studio$0.63 in$5.00 out1M99.8% up Google Vertex AI$1.25 in$10.00 out1M94.7% up

Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.

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-pro-preview-05-06"    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 42 scored outputs

How this is measured →

250.25xFloor

0100headroom →

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

Craft35

Originality18

Plays it safe

share of outputs that are the default answer

57%

Writing DNA

Stylometric Fingerprint

Based on 16 text responses

Tick = global average

Vocabulary Diversity58%

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

Sentence Length15.7 words

Average words per sentence.

Hedging0.38

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

Bold Formatting5.8

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

List Usage5.0

Bullet and numbered list items per 1,000 characters.

Section Structure0.63

Markdown headings per 1,000 characters.

Emoji Usage0.00

Emoji per 1,000 characters.

Transitions0.01

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

Opening Habits

Starts with greeting (31%)

Consistency

77%

Across 16 responses

Favorites

Movie

2001: A Space Odyssey

19688.0

Album

The Dark

Chelsea Wolfe

Book

The Hitchhiker's Guide to the Galaxy

Douglas Adams

City

Kyoto

Japan

Game

CHRONO

Casual, Indie

Model Responses

37 outputs · generated before accounting joined the chat

Keep exploring

COMPARE