CANONICAL HISTORY
Claude Sonnet 5.5 Release
Anthropic introduced Claude Sonnet 5.5 on September 28, 2026, describing it as the second model in the Claude 5.5 family.
Evidence / resource
This page preserves the public LINEAiGE record and its first-party source relationship.
Record identity
LINEAiGE IDclaude-sonnet-5-5-release-2026