Gemini 2.5 Pro was released by Google on March 25, 2025, as a flagship model in the Gemini Pro line.
Gemini 2.5 Pro is a thinking model that reasons before it answers and scored 18.8% on Humanity's Last Exam without tools, but it launched with a 1M-token context window, half of Gemini 2.0 Pro's 2M.
Compared with Gemini 2.0 Pro · the model it replaces
Answers almost 1 in 5 expert-level exam questions without outside help
Humanity's Last Exam — very hard expert questions, answered without tools
18.8%
✦ best score without tools at launch, Mar 2025 (Google)
Google's most expensive model for developers when paid use opened
Price per 1M tokens — what developers pay, input / output (prompts up to 200K)
$1.25 / $10
✦ paid price set Apr 2025 · above every other Google model at the time
Every Monday, only when something shipped: the AI models that came out, what each one changed, and which lines are due next.
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Gemini 4 Argon is the current model in this line. The card shows how long it has been since the last release against the line's usual gap and its recent ones — the rhythm, not a date.
Latest: Gemini 4 Argon · Oct 13, 2026
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