Which has fewer bugs, Claude Sonnet 5 or GPT-6 Astra?

GPT-6 Astra had 45% fewer counted bugs per line than Claude Sonnet 5 (1.16 vs 2.10). GPT-6 Astra ranks #3 of 7 and Claude Sonnet 5 #7.

Which is used more, Claude Sonnet 5 or GPT-6 Astra?

GPT-6 Astra, with 19.6% of the AI-written code reviewed by cubic in the week of Sep 14, 2026, against 4.0% for Claude Sonnet 5.

Updated Sep 26, 2026

GPT-6 Astra had 45% fewer counted bugs per line than Claude Sonnet 5 (1.16 vs 2.10).

Claude Sonnet 5 and GPT-6 Astra compared on relative bug rate, by coding agent, bug type, and language, and on price and usage.
Bug rate
	Claude Sonnet 5	GPT-6 Astra
Relative bug rate	2.10	1.16
Rank	#7 of 7	#3 of 7
Details
Share of AI-written code, week of Sep 14	4.0%	19.6%

1.00 = average · lower is better

Which has fewer bugs, Claude Sonnet 5 or GPT-6 Astra?: GPT-6 Astra had 45% fewer counted bugs per line than Claude Sonnet 5 (1.16 vs 2.10). GPT-6 Astra ranks #3 of 7 and Claude Sonnet 5 #7.
Which is used more, Claude Sonnet 5 or GPT-6 Astra?: GPT-6 Astra, with 19.6% of the AI-written code reviewed by cubic in the week of Sep 14, 2026, against 4.0% for Claude Sonnet 5.