Claude Sonnet 4.5

Anthropic

Best-in-world coding and agent capabilities

Text Generation API Claude Family v4.5
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Parameters
-
params
Context Window
1.0M
tokens
Max Output
64K
tokens
Input Price
$3.0000
per 1M tokens
Output Price
$15.0000
per 1M tokens

Claude Family Timeline 12 versions

Claude Sonnet 4.6 api
Feb 2026
Claude Opus 4.6 Latest api
Feb 2026
Claude Opus 4.5 api
Nov 2025
Claude Haiku 4.5 api
Oct 2025
Claude Sonnet 4.5 Current api
Sep 2025
Claude Opus 4.1 api
Aug 2025
Claude 4 Opus api
May 2025
Claude 4 Sonnet api
May 2025
Claude 3.5 Sonnet api
Jun 2024
Claude 3 Haiku api
Mar 2024
Claude 3 Opus api
Mar 2024
Claude 3.5 Sonnet (Bedrock) api
-

Capabilities

👁️
Vision
⚡
Function Calling
📋
JSON Mode
🌊
Streaming
💬
System Prompt
🖥️
Code Execution
🔍
Web Search
🔌
MCP Support

Extended Pricing

Input
$3.0000/1M
Output
$15.0000/1M
Cache Read
$0.3000/1M
Cache Write
$3.7500/1M

Details

Release Date
September 29, 2025
Knowledge Cutoff
April 1, 2025
Source
API
API Key Required
Yes
License
Proprietary
Model ID
claude-sonnet-4.5-new
Last updated: March 13, 2026