Claude Sonnet 4.5

deprecatedproprietary
Intelligence
Reasoning
Speed
Context
200K
Max output
64K
Input price
$3/1M tokens
Output price
$15/1M tokens
Alias ofclaude-sonnet-4-5

Capabilities

Reasoning & Interaction
Reasoning
Tool Calling
Output Control
Structured Output
JSON Mode
Infrastructure
Streaming
Batch Processing

Details

Model IDclaude-sonnet-4-5-20250929
Provider Anthropic
Creator anthropic
Familyclaude-sonnet
Licenseproprietary
Statusdeprecated
Typechat
Input modalitiestext, image
Output modalitiestext
Open weightNo
Parameters—
Architecture—
Context window200K tokens
Max input—
Max output64K tokens
Reasoning tokens—
Thinking modesExtended
Knowledge cutoff
Training data cutoff
Release date
Deprecation date
Retirement date
Priority tierYes
AWS Bedrock IDanthropic.claude-sonnet-4-5-20250929-v1:0
GCP Vertex IDclaude-sonnet-4-5@20250929
Sourceofficial

Tools

Function Callingfunction_calling
Call external functions and APIs
Computer Usecomputer_use
Control a virtual desktop
MCPmcp
Connect to Model Context Protocol servers

Endpoints

MessagesPOST
Create messages with multi-turn conversationshttps://api.anthropic.com/v1/messages

Pricing

Input
$3
Output
$15
Cache write (5m)
$3.75
Cache write (1h)
$6
Cache read
$0.3
Batch in
$1.5
Batch out
$7.5

Family Comparison: claude-sonnet

ModelContextMax outPricing
Claude Sonnet 5.51M128K$2$10
Claude Sonnet 51M128K$2$10
Claude Sonnet 3.7——$3$15
Claude Sonnet 4200K64K$3$15
Claude Sonnet 4.5200K64K$3$15
Claude Sonnet 4.61M128K$3$15

API

GET/v1/models/anthropic/claude-sonnet-4-5-20250929

Claude Sonnet 4.5

deprecated
claude-sonnet-4-5-20250929
alias → claude-sonnet-4-5
Changes · 13 entries
claude-sonnet-4-5-20250929updateca7a400Nov 2, 2026, 03:02 AM
statusactive→deprecated
claude-sonnet-4-5-20250929update8c801e2Oct 1, 2026, 06:40 AM
statusactive→deprecated
claude-sonnet-4-5-20250929update70e2981Sep 24, 2026, 11:29 AM
statusdeprecated→active
claude-sonnet-4-5-20250929update0ed066aJul 31, 2026, 11:38 AM
statusactive→deprecated
claude-sonnet-4-5-20250929updateeab58fcApr 17, 2026, 02:18 AM
pricingcache write 1h$6
extended_thinkingyes
release_date2025-09-29
thinking_modes["extended"]
bedrock_idanthropic.claude-sonnet-4-5-20250929-v1:0
vertex_idclaude-sonnet-4-5@20250929
retirement_date2026-09-29
claude-sonnet-4-5-20250929update22fb110Apr 1, 2026, 10:05 AM
context_window1000000→200000
claude-sonnet-4-5-20250929updatef43e286Mar 24, 2026, 04:45 AM
capabilitiesstructured outputyesjson modeyesbatchyes
claude-sonnet-4-5-20250929update2b100acMar 23, 2026, 05:30 AM
licenseproprietary
open_weightno
page_urlhttps://docs.anthropic.com/en/docs/about-claude/models#cl...
claude-sonnet-4-5-20250929update7a4f1f6Mar 22, 2026, 05:43 AM
performance4
reasoning4
extended_thinkingyes
training_data_cutoff2025-07
priority_tieryes
model_typechat
claude-sonnet-4-5-20250929updateb50649fMar 21, 2026, 11:58 PM
tools["function_calling","computer_use","mcp"]
endpoints["messages"]
claude-sonnet-4-5-20250929update2801e21Mar 21, 2026, 07:41 PM
pricingcache write$3.75
claude-sonnet-4-5-20250929updatec9a70c5Mar 21, 2026, 08:12 AM
knowledge_cutoffJan 2025→2025-01
claude-sonnet-4-5-20250929create7f5c66fMar 21, 2026, 05:16 AM