Claude Sonnet 4.5

What if your AI could compress multi-day coding projects into hours and reliably automate complex, multi-step tasks?

RecommendedClaude Sonnet 4.6 offers a compelling balance of advanced AI capabilities and cost-efficiency, making it a strong contender for a wide range of demanding applications.

Claude Sonnet 4.6 is a powerful and versatile AI model designed for daily use, scaled production, and complex tasks across coding, agents, and professional workflows. It offers frontier performance with optimal efficiency for high-volume use cases, capable of producing near-instant responses or extended, step-by-step thinking.

Visit Claude Sonnet 4.5
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Key Features:
  • 1M token context window (beta on API)
  • Exceptional coding performance across the software development lifecycle
  • Superior instruction following, tool selection, and error correction for autonomous AI workflows
  • Reliable handling of browser-based tasks and computer use
  • Efficient processing for high-volume, high-stakes professional workflows
Pros
  • Developers building real-time AI agents requiring sustained coherence and adaptive decision-making.
  • Teams needing to automate complex, multi-file coding projects and large-scale refactors.
  • Enterprises automating browser-based tasks and high-volume professional workflows in finance, research, and content.
Cons
  • The 1M token context window is currently in beta and only available via API.
  • While highly capable, it is positioned as a balance between performance and cost, with Opus models offering even higher performance for the hardest analytical tasks.
  • Users must ensure they have necessary rights/permissions when providing inputs, especially with third-party services.
Pricing
paidFree tier
Starting at:$3 per million input tokens
Free tier:Anyone can chat with Claude using Sonnet 4.6 on Claude.ai (web, iOS, Android).
Plans
  • Input Tokens: $3 / MTok
  • Output Tokens: $15 / MTok
  • 5m Cache Writes: $3.75 / MTok
  • 1h Cache Writes: $6 / MTok
  • Cache Hits & Refreshes: $0.30 / MTok
Categories:
Code & DevelopmentChatbots & AssistantsAI Infrastructure
Tags:
large language modelLLMAI agentcoding assistantworkflow automationenterprise AIcontext window
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Quick Decision
Try if: You need a powerful and cost-effective AI model for complex coding, autonomous agents, or high-volume professional tasks, especially if you value strong instruction following and error correction.
Skip if: You require an AI model exclusively for personal, non-commercial use without needing advanced features, or if you are under 18.
Not for: Users under 18, as the consumer product Claude.ai is not offered to them.; Those exclusively seeking the absolute highest performance without any cost consideration (Opus models might be more suitable).
Trust Signals

  • Team Size

    large
Compliance
Responsible Scaling PolicyTransparency HubEU Code of PracticeChild Safety Principles
Notable Customers
GithubRakuten AIReplitAugment CodeCode Rabbit
Tech Details
Platforms
webapiiOSAndroid
Integrations
Amazon BedrockGoogle Cloud's Vertex AIMicrosoft Foundry

  • AI Model

    Claude Sonnet 4.6
Open Source
No
Support
Channels
support centerchatbot
Company

  • Name

    Anthropic

Anthropic is an AI safety and research company dedicated to building reliable, interpretable, and steerable AI systems. They are a Public Benefit Corporation focused on the responsible development and maintenance of advanced AI for the long-term benefit of humanity.

FAQ

When should I use Claude Sonnet 4.6?

Claude Sonnet 4.6 is recommended for most AI applications where you need a balance of advanced capabilities and cost-efficient performance at scale. Common use cases include customer-facing agents, production coding workflows, content generation at scale, and real-time research tasks.

How much does it cost to use Claude Sonnet 4.6?

Pricing for Sonnet 4.6 starts at $3 per million input tokens and $15 per million output tokens. There are also specific rates for cache writes and hits. Cost savings of up to 90% are available with prompt caching and 50% with batch processing.

What is 'extended thinking' and when should I use it?

Extended thinking mode allows the model to use more effort for complex reasoning. It is best used when performance and accuracy are more critical than latency, such as for complex reasoning tasks, extended agentic work, multi-step coding projects, and deep research.

How does Anthropic ensure the safety and privacy of user data?

Anthropic conducts extensive testing and evaluation, working with external experts to ensure safety, security, and reliability. They publish model cards covering safety results in depth. User inputs and outputs may be used to train models unless users opt out, with exceptions for safety reviews and explicit feedback. They also have a detailed Privacy Policy and Usage Policy.

Can Claude Sonnet 4.6 be used for commercial purposes?

Yes, Claude Sonnet 4.6 is available for developers via API and through cloud platforms like Amazon Bedrock, Google Cloud's Vertex AI, and Microsoft Foundry, indicating its suitability for commercial and enterprise use cases.

Use Cases
  • Developers building real-time AI agents requiring sustained coherence and adaptive decision-making.
  • Teams needing to automate complex, multi-file coding projects and large-scale refactors.
  • Enterprises automating browser-based tasks and high-volume professional workflows in finance, research, and content.
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