Claude Sonnet 5.5 — reviews, specs & pricing

Anthropic's faster, more efficient Sonnet upgrade in the Claude 5.5 family for everyday coding and document work.

Summary

Anthropic's faster, more efficient Sonnet upgrade in the Claude 5.5 family for everyday coding and document work.

Sample use case

Everyday coding, bug fixing and document work

Specifications

  • Provider: anthropic
  • License: proprietary
  • Context: 1000k tokens
  • Input price: $2/M tok
  • Output price: $10/M tok
  • Released: 2026-09-28

Pros

  • 30%+ faster than Sonnet 5
  • Up to 30% cheaper per task
  • Big agentic coding gains

Cons

  • Below Opus 5.5 on complex judgment
  • Some breaking API changes from Sonnet 5

Average rating 0.0 from 0 community reviews on Reviuws.

Frequently asked questions

What is Claude Sonnet 5.5?

Anthropic's faster, more efficient Sonnet upgrade in the Claude 5.5 family for everyday coding and document work.

How much does Claude Sonnet 5.5 cost?

Claude Sonnet 5.5 costs $2 per million input tokens and $10 per million output tokens.

Is Claude Sonnet 5.5 open source?

Claude Sonnet 5.5 is released under the proprietary license.