Claude Sonnet 4.5
Anthropic closed 2025-09-29
Legacy
Killed
Claude Sonnet 4.5 is killed. The executioner, Claude Haiku 5.5, costs $0.20 and scores 43.4: no more expensive, no weaker. Choosing Claude Sonnet 4.5 means paying more for nothing.
- Score
- 20.7
- Artificial Analysis Intelligence Index
- Best rank
- #64
- Arena — Text
- Price
- $6.00
- Blended Price, USD per 1M tokens (3:1 input:output)
No longer listed as current by its source, so this page shows only the verdict and its scores.
Scores on each board Each rank is the board’s own: the rank it publishes, or the model’s place in the board’s own order where it publishes none. The bar shows how much of that board the model ranks ahead of. Scores from different boards cannot be compared.
- Artificial Analysis LLM LeaderboardArtificial Analysis Intelligence Index20.7No. 115 of 375
- Epoch AI Benchmarking HubFrontierMath Tiers 1–323.9%No. 66 of 82
- Arena — CodeOverall1393No. 95 of 142
- Arena — TextOverall (style control)1456No. 64 of 414
Compare with the executioner, Claude Haiku 5.5 → See the current SOTA models →
Details
- Family
- Claude → Claude Sonnet
- Blended Price, USD per 1M tokens (3:1 input:output)
- $6.00
- Sources
- 4 boards ·9 scores ·6 settings
- Also written as
-
Claude 4.5 Sonnetclaude-4-5-sonnetclaude-sonnet-4-5