Unverified50% confidenceReleaseExact time
Claude Code v2.1.280 introduces the new Claude Opus 5.5 model (claude-opus-5-5) and sets it as the default Opus model.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
9/22/2026
First Seen
Valid until: 12/21/2026
Sources
Related Entities
Related Claims
UnverifiedThe default model of Claude Code 2.1 has been upgraded to Opus 4.6.80% similarUnverifiedOpus 5 is the flagship model of Anthropic's Claude series, known for its longer context window (capable of handling codebases of hundreds of thousands of tokens) and more cautious output style.73% similar
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