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Anthropic · Active

Claude Opus 5.5

claude-opus family · launched 2026-09-26

MultimodalReasoningToolsStructured
AITopic score85.7#2 overall

Flagship Claude model for deep reasoning, coding, and long-horizon agents

Evidence coverage3%1 evaluations · 1 institutions
Context / maximum output1M / 128ktokens
Cache / input / output$0.4 · $8 · $40USD per million tokens
Value / freshness52.5 / 100relative value · release freshness
Product profile

What this model supports

Inputtext, image
Outputtext
Knowledge cutoff2026-06
WeightsProprietary / hosted
Capability profile

Strengths by domain

Coding—0 public results
Research & reasoning—0 public results
Professional work—0 public results
Knowledge & instruction—0 public results
Behind the score

Every result has a source

Raw results and standardized readings are shown together. Missing tests add neither points nor penalties.

Human preference & indices2 results

AA IndexArtificial Analysis71.81 indexReading 85.7

Imported from a directly fetched third-party leaderboard.

Configuration: Claude Opus 5.5Open evidence
Arena TextLMArena1,515.8 EloReading 85.7

Direct LMArena text leaderboard result.

Open evidence
Same builder

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