Claude Sonnet 5.5 Description

Claude Sonnet 5.5 is a general-purpose AI model from Anthropic built for everyday professional tasks, agentic coding, knowledge work, and fast iteration. It is the second model in the Claude 5.5 family and is intended to complement Claude Opus 5.5 by offering lower-cost performance on more clearly defined workloads. Anthropic reports that Sonnet 5.5 generates output more than 30% faster than Sonnet 5 and usually completes tasks with fewer tokens. Pricing remains $2 per million input tokens and $10 per million output tokens, with cache reads priced at $0.20 per million tokens. On Terminal-Bench 4.0, the model scores 70.6%, compared with 10.3% for Sonnet 5, while also posting sizable improvements on FrontierCode, CursorBench, and other coding benchmarks. Its knowledge-work results are also substantially stronger, including a GDPval-AA score of 1844 and an AA-Briefcase score of 1811, both close to Claude Opus 5.5. Anthropic says early testers found the model faster, more collaborative, more concise, and particularly strong at design-oriented work such as polished interfaces and presentation decks. The model supports adjustable effort levels so users can trade off speed and cost against more extended reasoning and checking. Claude Sonnet 5.5 is available through Claude apps, Claude Code, the Claude Platform, and major cloud providers including AWS, Google Cloud, and Microsoft Azure.

Pricing

Pricing Starts At:
$2 per 1M tokens (input)
Pricing Information:
$2 per million input tokens and $10 per million output tokens.

Cache reads, which account for most costs in agentic and coding workloads, are priced at just $0.20 per million tokens

Integrations

API:
Yes, Claude Sonnet 5.5 has an API

Reviews - 1 Verified Review

Total
ease
features

Company Details

Company:
Anthropic
Year Founded:
2021
Headquarters:
United States
Website:
claude.ai

Media

Claude Sonnet 5.5 Screenshot 1
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Product Details

Platforms
Web-Based
Types of Training
Training Docs
Customer Support
Online Support

Claude Sonnet 5.5 User Reviews

Write a Review
  • Name: Anonymous (Verified)
    Job Title: CTO
    Length of product use: Less than 6 months
    Used How Often?: Daily
    Role: User, Administrator
    Organization Size: 26 - 99
    Features
    Ease
    Pricing
    Likelihood to Recommend to Others
    1 2 3 4 5 6 7 8 9 10

    Really fast/efficient and good reasoning abilities

    Date: Sep 28 2026

    Summary: Claude Sonnet 5.5 is probably the model I would want as my everyday coding workhorse. It is fast, efficient, strong at practical development tasks, and capable enough that I rarely feel like I am sacrificing much by not using a heavier model.

    Positive: I can give it a normal development task and it tends to get to the answer with less wandering, fewer unnecessary tool calls, and less back-and-forth than Sonnet 5. Coding is where I notice the improvement the most. It is really good for feature work, fixing bugs, refactoring, and the everyday engineering tasks where I want something fast and capable without automatically reaching for Opus. The speed is another big advantage. Sonnet 5.5 feels better suited to rapid iteration because I can make a change, test it, adjust the prompt, and keep moving without the slower pace I sometimes get from heavier reasoning models.

    Negative: The main downside is that I would still move up to Opus 5.5 for really messy architecture problems, long autonomous agent runs, or tasks where I want maximum reasoning depth.

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