Which has fewer bugs, GPT-5.6 Sol or GPT-6 Astra?

GPT-5.6 Sol had 37% fewer counted bugs per line than GPT-6 Astra (0.73 vs 1.16). GPT-5.6 Sol ranks #1 of 7 and GPT-6 Astra #3.

Which is used more, GPT-5.6 Sol 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 7.2% for GPT-5.6 Sol.

Updated Sep 26, 2026

GPT-5.6 Sol had 37% fewer counted bugs per line than GPT-6 Astra (0.73 vs 1.16).

GPT-5.6 Sol and GPT-6 Astra compared on relative bug rate, by coding agent, bug type, and language, and on price and usage.
Bug rate
	GPT-5.6 Sol	GPT-6 Astra
Relative bug rate	0.73	1.16
Rank	#1 of 7	#3 of 7
By coding agent
Codex	0.71	1.42
Details
Share of AI-written code, week of Sep 14	7.2%	19.6%

1.00 = average · lower is better

Which has fewer bugs, GPT-5.6 Sol or GPT-6 Astra?: GPT-5.6 Sol had 37% fewer counted bugs per line than GPT-6 Astra (0.73 vs 1.16). GPT-5.6 Sol ranks #1 of 7 and GPT-6 Astra #3.
Which is used more, GPT-5.6 Sol 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 7.2% for GPT-5.6 Sol.