Gemini 2.5 Pro vs GPT-5.5
How Gemini 2.5 Pro (Google) and GPT-5.5 (OpenAI) compare on price and capabilities — and how to use either on anyAInow without a subscription.
Gemini 2.5 Pro
Flagship
GPT-5.5
Flagship
Provider
Google
OpenAI
Best for
Flagship
Flagship
Reads images
Yes
Yes
GPQA Diamond
84.4%
93.5%
AA Coding Index
33.3%
74.9%
MMLU-Pro
86.2%
—
Price
from $20 / 1M
from $50 / 1M
Subscription
None
None
Benchmark source: artificialanalysis.ai, as of 13 Aug 2026. Higher is better; figures are publisher-reported where not independently verified.
Gemini 2.5 Pro or GPT-5.5?
Gemini 2.5 Pro and GPT-5.5 both sit in the flagship tier, so they're closely matched for everyday work. Gemini 2.5 Pro is the more cost-efficient of the two. On the GPQA Diamond reasoning benchmark, GPT-5.5 leads 93.5% to 84.4%. On anyAInow you can use either — or run both side by side to see which answers your prompts better — pay-as-you-go with no subscription.