Anthropic: Claude Sonnet 4

Claude Sonnet 4 significantly enhances the capabilities of its predecessor, Sonnet 3.7, excelling in both coding and reasoning tasks with improved precision and controllability.

Context
1M
Max output
64K
Input price
$3/1M tokens
Output price
$15/1M tokens

Capabilities

vision
tool call
structured output
reasoning
json mode
streaming
fine tuning
batch

Details

Model IDanthropic/claude-sonnet-4
Provider OpenRouter
Creator Anthropic
Familyclaude-sonnet
License—
Parameters—
Status—
Input modalitiesimage, text
Output modalitiestext
Architecture—
Knowledge cutoff—
Training data cutoff—
Release date
Deprecation date—
Typechat
Reasoning tokens—
Max input—
Open weight—
Sourceofficial
Last updated

Tools

Function Callingfunction_calling
Call external functions and APIs

Pricing

Input
$3
Output
$15
Cache write
—
Cache read
$0.3
Batch in
—
Batch out
—

Family Comparison: claude-sonnet

ModelContextMax outPricing
Anthropic Claude Sonnet Latest1M128K$3$15
Anthropic: Claude 3.7 Sonnet (thinking)200K64K$3$15
Anthropic: Claude 3.7 Sonnet200K64K$3$15
Anthropic: Claude Sonnet 4.51M64K$3$15
Anthropic: Claude Sonnet 4.61M128K$3$15
Anthropic: Claude Sonnet 41M64K$3$15
Anthropic: Claude 3.5 Sonnet200K8K$6$30

API

GET/v1/models/openrouter/anthropic/claude-sonnet-4

Anthropic: Claude Sonnet 4

anthropic/claude-sonnet-4

Claude Sonnet 4 significantly enhances the capabilities of its predecessor, Sonnet 3.7, excelling in both coding and reasoning tasks with improved precision and controllability.

Changes · 3 entries
anthropic/claude-sonnet-4update14e5cfdApr 13, 2026, 02:40 AM
context_window200000→1000000
anthropic/claude-sonnet-4update2b100acMar 23, 2026, 05:30 AM
model_typechat
release_date2025-05-22
taglineClaude Sonnet 4 significantly enhances the capabilities o...
tools["function_calling"]
anthropic/claude-sonnet-4create7f5c66fMar 21, 2026, 05:16 AM