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Family
Light
Anthropic
Claude 5.5 family
3 releases · Elo progression and succession lineage (D9)
Elo progression
Sep 2026
Claude Opus 5.5
CLOSED
—
3266.5
Sep 2026
Claude Sonnet 5.5
CLOSED
—
succeeds Claude Opus 5.5
-25.7
3240.8
Oct 2026
Claude Haiku 5.5
CLOSED
—
succeeds Claude Sonnet 5.5
-318.8
2922.0