Unverified50% confidenceDecision RuleExact time
Opus 5.5's default reasoning tier is set to medium, which is also the officially recommended tier, with complex tasks adjustable to high.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
10/4/2026
First Seen
Valid until: 1/2/2027
Sources
Related Entities
Related Claims
UnverifiedOpus 5 has a 1-million-token context window, which is both the default and the maximum.64% similarUnverifiedDevelopers are advised to allocate tools based on task importance: use Gemini Flash for low-risk iterative tasks, and use Claude Code or Codex for critical tasks.59% similarUnverifiedOfficials state that Sonnet 5.5 performs comparably to the Opus model on many tasks.57% similarUnverifiedOn most tasks, Opus 5.5's performance is comparable to Fable 5.1.55% similar
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