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.

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Gemini 3.1 Pro

Flagship

GPT-5.5

Flagship

Provider

Google

OpenAI

Best for

Flagship

Reads images

Yes

GPQA Diamond

94.3%

93.6%

SWE-Bench Verified

80.6%

—

Price

from $20 / 1M

from $50 / 1M

Subscription

None

Benchmark source: llm-stats.com, as of 28 Jun 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 94.3% to 93.6%. 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.

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