Claude Sonnet 4.5

Claude Sonnet 4.5

Developer	Anthropic
Release date	September 29, 2025
Family	Claude
Generation	Claude 4.5
Level
Context window	1M tokens
Max output	64K tokens
Input	Text, image, file
Output	Text
Knowledge cutoff	2025-07-31
Weights	Closed
Predecessor	Claude Sonnet 4
Successor	Claude Sonnet 4.6
Website	anthropic.com
Links	Model card Docs

Part of a series on

input: $3.00
cached: $0.30
output: $15.00
cache write: $3.75
Context: 1Mtokens
Released: 1y ago

Specifications

Model

Developer: Anthropic
Family: Claude Claude 4.5
Type: Language model
Released: September 29, 2025
Model ID: anthropic/claude-sonnet-4.5

Capabilities

Input → output: Text, image, file → Text
Max output: 64K tokens
Tokenizer: Claude
Knowledge cutoff: 2025-07-31

Weights

Openness: Closed

Sources:models.devOpenRouter

Metadata synced Nov 7, 2026, 2:00 PM UTC

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