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

GPT-6 Astra had 26% fewer counted bugs per line than Claude Opus 5 (1.16 vs 1.58). GPT-6 Astra ranks #3 of 7 and Claude Opus 5 #6.

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

Claude Opus 5, with 38.3% of the AI-written code reviewed by cubic in the week of Sep 14, 2026, against 19.6% for GPT-6 Astra.

Updated Sep 26, 2026

GPT-6 Astra had 26% fewer counted bugs per line than Claude Opus 5 (1.16 vs 1.58).

Claude Opus 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 Opus 5	GPT-6 Astra
Relative bug rate	1.58	1.16
Rank	#6 of 7	#3 of 7
Details
Share of AI-written code, week of Sep 14	38.3%	19.6%

1.00 = average · lower is better

Which has fewer bugs, Claude Opus 5 or GPT-6 Astra?: GPT-6 Astra had 26% fewer counted bugs per line than Claude Opus 5 (1.16 vs 1.58). GPT-6 Astra ranks #3 of 7 and Claude Opus 5 #6.
Which is used more, Claude Opus 5 or GPT-6 Astra?: Claude Opus 5, with 38.3% of the AI-written code reviewed by cubic in the week of Sep 14, 2026, against 19.6% for GPT-6 Astra.