Anthropic: Claude Sonnet 4.5

Name: Anthropic: Claude Sonnet 4.5
Author: OpenRouter

Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows.

Context

Max output

64K

Input price

$3/1M tokens

Output price

$15/1M tokens

Capabilities

Show unsupported (4)

Reasoning & Interaction

Reasoning

Tool Calling

Output Control

Structured Output

JSON Mode

Details

Model IDanthropic/claude-sonnet-4.5

ProviderOpenRouter

CreatorAnthropic

Familyclaude-sonnet

License—

Status—

Typechat

Input modalitiestext, image

Output modalitiestext

Open weight—

Parameters—

Architecture—

Context window1M tokens

Max input—

Max output64K tokens

Reasoning tokens—

Knowledge cutoff—

Release date2025-09-29

Sourceofficial

Tools

Function Callingfunction_calling

Call external functions and APIs

Pricing

Input

Output

$15

Cache write

—

Cache read

$0.3

Batch in

—

Batch out

—

Family Comparison: claude-sonnet

Model	Caps	Perf	Speed	Context	Max out	Pricing
Anthropic: Claude Sonnet 5 (batch)	RTJJM	—	—	1M	128K	$1$5
Anthropic: Claude Sonnet 5.5 (batch)	RTJJM	—	—	1M	128K	$1$5
Anthropic: Claude Sonnet 4.5 (batch)	RTJJM	—	—	1M	64K	$1.5$7.5
Anthropic: Claude Sonnet 4.6 (batch)	RTJJM	—	—	1M	128K	$1.5$7.5
Anthropic: Claude Sonnet Latest	RTJJM	—	—	1M	128K	$2$10
Anthropic: Claude Sonnet 5.5	RTJJM	—	—	1M	128K	$2$10
Anthropic: Claude Sonnet 5	RTJJMSB	—	—	1M	128K	$2$10
Anthropic: Claude 3.7 Sonnet (thinking)	RT	—	—	200K	64K	$3$15
Anthropic: Claude 3.7 Sonnet	RT	—	—	200K	64K	$3$15
Anthropic: Claude Sonnet 4.5	RTJJM	—	—	1M	64K	$3$15
Anthropic: Claude Sonnet 4.6	RTJJM	—	—	1M	128K	$3$15
Anthropic: Claude Sonnet 4	RT	—	—	200K	64K	$3$15
Anthropic: Claude 3.5 Sonnet	T	—	—	200K	8K	$6$30

API

GET/v1/models/openrouter/anthropic/claude-sonnet-4.5