Which has fewer bugs, Claude Opus 4.8 or GPT-5.6 Sol?

GPT-5.6 Sol had 17% fewer counted bugs per line than Claude Opus 4.8 (0.73 vs 0.88). GPT-5.6 Sol ranks #1 of 7 and Claude Opus 4.8 #2.

Which is used more, Claude Opus 4.8 or GPT-5.6 Sol?

GPT-5.6 Sol, with 7.2% 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

GPT-5.6 Sol had 17% fewer counted bugs per line than Claude Opus 4.8 (0.73 vs 0.88).

Claude Opus 4.8 and GPT-5.6 Sol compared on relative bug rate, by coding agent, bug type, and language, and on price and usage.
Bug rate
	Claude Opus 4.8	GPT-5.6 Sol
Relative bug rate	0.88	0.73
Rank	#2 of 7	#1 of 7
By coding agent
Cursor	1.13	1.56
Details
Share of AI-written code, week of Sep 14	1.9%	7.2%

1.00 = average · lower is better

Which has fewer bugs, Claude Opus 4.8 or GPT-5.6 Sol?: GPT-5.6 Sol had 17% fewer counted bugs per line than Claude Opus 4.8 (0.73 vs 0.88). GPT-5.6 Sol ranks #1 of 7 and Claude Opus 4.8 #2.
Which is used more, Claude Opus 4.8 or GPT-5.6 Sol?: GPT-5.6 Sol, with 7.2% of the AI-written code reviewed by cubic in the week of Sep 14, 2026, against 1.9% for Claude Opus 4.8.