GPT-5.5 vs Grok 4.3

How GPT-5.5 (OpenAI) and Grok 4.3 (xAI) compare on price and capabilities — and how to use either on anyAInow without a subscription.

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GPT-5.5

Flagship

Grok 4.3

Flagship

Provider

OpenAI

xAI

Best for

Flagship

Reads images

Yes

GPQA Diamond

93.6%

—

Price

from $50 / 1M

from $10 / 1M

Subscription

None

Benchmark source: llm-stats.com, as of 28 Jun 2026. Higher is better; figures are publisher-reported where not independently verified.

GPT-5.5 or Grok 4.3?

GPT-5.5 and Grok 4.3 both sit in the flagship tier, so they're closely matched for everyday work. Grok 4.3 is the more cost-efficient of the two. 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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GPT-5.5 Grok 4.3 All models Pricing