Anthropic: Claude Sonnet 5.5

Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade.

Context
1M
Max output
128K
Input price
$2/1M tokens
Output price
$10/1M tokens

Capabilities

Reasoning & Interaction
Reasoning
Tool Calling
Output Control
Structured Output
JSON Mode

Details

Model IDanthropic/claude-sonnet-5.5
Provider OpenRouter
Creator Anthropic
Familyclaude-sonnet
License—
Status—
Typechat
Input modalitiestext, image
Output modalitiestext
Open weight—
Parameters—
Architecture—
Context window1M tokens
Max input—
Max output128K tokens
Reasoning tokens—
Knowledge cutoff—
Release date
Sourceofficial

Tools

Function Callingfunction_calling
Call external functions and APIs

Pricing

Input
$2
Output
$10
Cache write
—
Cache read
$0.1
Batch in
—
Batch out
—

Family Comparison: claude-sonnet

ModelContextMax outPricing
Anthropic: Claude Sonnet 5 (batch)1M128K$1$5
Anthropic: Claude Sonnet 5.5 (batch)1M128K$1$5
Anthropic: Claude Sonnet 4.5 (batch)1M64K$1.5$7.5
Anthropic: Claude Sonnet 4.6 (batch)1M128K$1.5$7.5
Anthropic: Claude Sonnet Latest1M128K$2$10
Anthropic: Claude Sonnet 5.51M128K$2$10
Anthropic: Claude Sonnet 51M128K$2$10
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 4200K64K$3$15
Anthropic: Claude 3.5 Sonnet200K8K$6$30

API

GET/v1/models/openrouter/anthropic/claude-sonnet-5.5

Anthropic: Claude Sonnet 5.5

anthropic/claude-sonnet-5.5

Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade.

Changes · 3 entries
anthropic/claude-sonnet-5.5createca7a400Nov 2, 2026, 03:02 AM
anthropic/claude-sonnet-5.5updateda0e420Oct 8, 2026, 06:41 AM
pricingcached input$0.2→$0.1
anthropic/claude-sonnet-5.5create1a66bb0Sep 29, 2026, 06:40 AM