Claude Sonnet 5.5

Claude Sonnet 5.5 for everyday coding, bug fixes and professional documents

Published

scheduleReleased：September 28, 2026

Claude Sonnet 5.5 is available on Claude Platform, AWS, Google Cloud and Azure. Anthropic reports over 30% faster output and up to 30% lower task cost than Sonnet 5, not lower token rates.

starsCapabilities

visibilityVision understandingcodeFunction callingdata_objectStructured output

paymentsContext and pricing

Context limit1,000,000

Max output128,000

Knowledge cutoff2026-06

Input price$2/ 1M tokens

Output price$10/ 1M tokens

Cached input price$0.1/ 1M tokens

descriptionOverview

Overview

Released September 28, 2026, Claude Sonnet 5.5 uses API ID claude-sonnet-5-5 for everyday coding, bug fixes, documents, slides and spreadsheets, with image understanding.

Pricing and migration

Standard USD pricing per million tokens is 2 input, 10 output, 0.20 cache read and 2.50 cache write. Lower task costs refer to reduced usage rather than discounted token rates. Available through Claude Platform, AWS, Google Cloud and Azure. Applications previously disabling thinking must migrate to between_tools according to the official migration guide.

lightbulbUse cases

Long-document analysis and summarization
Code review and rewriting
Enterprise knowledge Q&A
Agent and tool workflows

thumb_upStrengths

Strong fit for long-context tasks
Careful writing and analysis style
Useful for enterprise safety requirements
Easy to tier against Haiku, Sonnet and Opus

infoLimitations

Cost and latency vary by tier
Tool workflows and long-running tasks need testing
Some workloads may be better on a smaller model
Capabilities depend on Anthropic documentation

linkReferences

open_in_newhttps://www.anthropic.com/claude-sonnet-5-5