Gemini 3.1 Pro vs GPT-5.5
How Gemini 3.1 Pro (Google) and GPT-5.5 (OpenAI) compare on price and capabilities — and how to use either on anyAInow without a subscription.
Gemini 3.1 Pro
Flagship
GPT-5.5
Flagship
Provider
Google
OpenAI
Best for
Flagship
Flagship
Reads images
Yes
Yes
GPQA Diamond
94.1%
93.5%
AA Coding Index
68.8%
74.9%
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 3.1 Pro or GPT-5.5?
Gemini 3.1 Pro and GPT-5.5 both sit in the flagship tier, so they're closely matched for everyday work. Gemini 3.1 Pro is the more cost-efficient of the two. On the GPQA Diamond reasoning benchmark, Gemini 3.1 Pro leads 94.1% to 93.5%. 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.