Which has fewer bugs, Claude Opus 4.8 or GPT-6 Astra?

Claude Opus 4.8 had 24% fewer counted bugs per line than GPT-6 Astra (0.88 vs 1.16). Claude Opus 4.8 ranks #2 of 7 and GPT-6 Astra #3.

Which is used more, Claude Opus 4.8 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 1.9% for Claude Opus 4.8.

Updated Sep 26, 2026

Claude Opus 4.8 had 24% fewer counted bugs per line than GPT-6 Astra (0.88 vs 1.16).

Claude Opus 4.8 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 4.8	GPT-6 Astra
Relative bug rate	0.88	1.16
Rank	#2 of 7	#3 of 7
Details
Share of AI-written code, week of Sep 14	1.9%	19.6%

1.00 = average · lower is better

Which has fewer bugs, Claude Opus 4.8 or GPT-6 Astra?: Claude Opus 4.8 had 24% fewer counted bugs per line than GPT-6 Astra (0.88 vs 1.16). Claude Opus 4.8 ranks #2 of 7 and GPT-6 Astra #3.
Which is used more, Claude Opus 4.8 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 1.9% for Claude Opus 4.8.