Claude Sonnet 4.5

Every figure OnlySOTA holds for this model, one source at a time. Nothing on this page is averaged across sources.

KILLED Retired

Identity

Developer

Anthropic

Family

Claude → Claude Sonnet

Weights

closed

Released

2025-09-29

Blended Price, USD per 1M tokens (3:1 input:output)

$6.00

Sources

3 sources · 6 entries · 4 configs

Published upstream as

Claude 4.5 Sonnetclaude-4-5-sonnetclaude-sonnet-4-5

Where it places

• Artificial Analysis LLM Leaderboard Artificial Analysis Intelligence Index 37.4
• Arena — Code Overall #69 1392
• Arena — Text Overall (style control) #57 1456

Effort ladder

• Arena — Code only high ran

  1. high 1392

• Arena — Text only high ran

  1. high 1456