Claude Sonnet 4.6 vs GPT-5.5
How Claude Sonnet 4.6 (Anthropic) and GPT-5.5 (OpenAI) compare on price and capabilities — and how to use either on anyAInow without a subscription.
Claude Sonnet 4.6
Balanced
GPT-5.5
Flagship
Provider
Anthropic
OpenAI
Best for
Balanced
Flagship
Reads images
Yes
Yes
GPQA Diamond
89.9%
93.6%
SWE-Bench Verified
79.6%
—
Price
from $30 / 1M
from $50 / 1M
Subscription
None
None
Benchmark source: llm-stats.com, as of 28 Jun 2026. Higher is better; figures are publisher-reported where not independently verified.
Claude Sonnet 4.6 or GPT-5.5?
Claude Sonnet 4.6 is a balanced-tier model, while GPT-5.5 is flagship-tier. Claude Sonnet 4.6 is the more cost-efficient of the two. On the GPQA Diamond reasoning benchmark, GPT-5.5 leads 93.6% to 89.9%. 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.