Which is cheaper, Claude Sonnet 5.5 or GPT-5.5?

Claude Sonnet 5.5 lists at $2 input / $10 output per 1M tokens; GPT-5.5 lists at $5 input / $30 output per 1M tokens. Claude Sonnet 5.5 has the lower list price.

Which is used more, Claude Sonnet 5.5 or GPT-5.5?

Claude Sonnet 5.5, with 2.4% of the AI-written code reviewed by cubic in the week of Sep 28, 2026, against 0.1% for GPT-5.5.

Updated Oct 5, 2026

Claude Sonnet 5.5 vs GPT-5.5

GPT-5.5 is no longer ranked because it now writes under 0.5% of AI-attributed lines.

Claude Sonnet 5.5 and GPT-5.5 compared on relative bug rate and on price and usage.
Bug rate
	Claude Sonnet 5.5	GPT-5.5
Relative bug rate	0.96	No longer ranked
Details
Provider	Anthropic	OpenAI
Released	Sep 28, 2026	Apr 23, 2026
List price	$2 input / $10 output per 1M tokens	$5 input / $30 output per 1M tokens
Share of AI-written code, week of Sep 28	2.4%	0.1%

1.00 = average · lower is better

More comparisons

All comparisons →

Questions and answers

Which has fewer bugs, Claude Sonnet 5.5 or GPT-5.5?: GPT-5.5 is no longer ranked because it now writes under 0.5% of AI-attributed lines.
Which is cheaper, Claude Sonnet 5.5 or GPT-5.5?: Claude Sonnet 5.5 lists at $2 input / $10 output per 1M tokens; GPT-5.5 lists at $5 input / $30 output per 1M tokens. Claude Sonnet 5.5 has the lower list price.
Which is used more, Claude Sonnet 5.5 or GPT-5.5?: Claude Sonnet 5.5, with 2.4% of the AI-written code reviewed by cubic in the week of Sep 28, 2026, against 0.1% for GPT-5.5.