Unverified50% confidenceFactExact time
In testing, Opus defaults to high effort in Claude Code, while Astra defaults to medium effort in Codex.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
10/7/2026
First Seen
Valid until: 1/5/2027
Sources
Related Entities
Related Claims
Unverifiedeffort (reasoning intensity) is the primary control for adjusting the amount of reasoning in Opus 5.5; its default value is medium, and its performance at that level can match or even exceed Opus 5 at high intensity.66% similarUnverifiedThe output ceiling of models such as Opus 5.5 and Astra is only 128K–300K tokens (approximately 90–180 pages).59% similarUnverifiedCodex offers four levels of Reasoning Effort: low, medium, high, and extra high.58% similar
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