Which is cheaper, Claude Opus 5.5 or GPT-6 Astra?

Claude Opus 5.5 lists at $4 input / $20 output per 1M tokens; GPT-6 Astra lists at $10 input / $50 output per 1M tokens. Claude Opus 5.5 has the lower list price.

Updated Sep 26, 2026

Claude Opus 5.5 vs GPT-6 Astra

Claude Opus 5.5 does not have enough reviewed code to rank yet.

Claude Opus 5.5 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 5.5	GPT-6 Astra
Relative bug rate	Launch week	1.16
Details
Provider	Anthropic	OpenAI
Released	Sep 22, 2026	Sep 4, 2026
List price	$4 input / $20 output per 1M tokens	$10 input / $50 output per 1M tokens

1.00 = average · lower is better

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Questions and answers

Which has fewer bugs, Claude Opus 5.5 or GPT-6 Astra?: Claude Opus 5.5 does not have enough reviewed code to rank yet.
Which is cheaper, Claude Opus 5.5 or GPT-6 Astra?: Claude Opus 5.5 lists at $4 input / $20 output per 1M tokens; GPT-6 Astra lists at $10 input / $50 output per 1M tokens. Claude Opus 5.5 has the lower list price.