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Claude Sonnet 4: Precise, Controllable Coding and Reasoning
Released on May 22, 2025 as part of the Claude Sonnet lineup, Claude Sonnet 4 sits alongside Claude Opus 4 and is positioned as a model that excels in both coding and reasoning with improved precision and controllability.
Designed to maintain efficiency and responsiveness across diverse internal and external scenarios, it offers reliable performance for workflows that require balanced intelligence and speed. These strengths make it well-suited for coding support, structured reasoning tasks, and environments where consistent, controllable output is essential.
Claude Sonnet 4: Key Specs
Below are Claude Sonnet 4's main specs and how they translate into real-world behavior.
- Context Window - 1,000,000 tokens: This extremely large context capacity allows Claude Sonnet 4 to work with long-running conversations, multi-document analysis, and deeply layered tasks while keeping earlier details fully accessible.
- Maximum Output Length - 64,000 tokens: The model can generate long, detailed responses, making it suitable for comprehensive explanations, multi-section reports, and complex content created in a single pass.
- Speed and Efficiency - Offers smooth, brisk responsiveness: Claude Sonnet 4 maintains a natural interaction flow with a comfortably quick pace suitable for both conversational and workflow-oriented tasks.
- Cost Efficiency - Positioned in a mid-to-high usage tier: The model's cost structure makes it a good fit for teams that need stronger reasoning and stability without entering the most expensive category.
- Reasoning and Accuracy - Higher-level reasoning capability: Claude Sonnet 4 handles complex instructions, analytical tasks, and multi-step problem-solving with solid clarity and dependable logic.
- Multimodal Capabilities - Supports text, code, and image input, outputs text: It can interpret diagrams, screenshots, and code snippets alongside written prompts, generating clear, coherent text responses from mixed media.
Compare Claude Sonnet 4, Claude Opus 4, and Claude 3.7 Sonnet
A brief overview of how each model differs in power, speed, and use cases.
| Feature | Claude Sonnet 4 | Claude Opus 4 | Claude 3.7 Sonnet |
|---|---|---|---|
| Knowledge Cutoff | Mar 2025 | Mar 2025 | Oct 2024 |
| Context Window (Tokens) | 1,000,000 | 200,000 | 200,000 |
| Max Output Tokens | 64,000 | 32,000 | 128,000 |
| Input Modalities | Text, Code, Image | Text, Code, Image | Text, Code, Image |
| Output Modalities | Text | Text | Text |
| Latency (OpenRouter Data) | 1.06s | 2.82s | 0.93s |
| Speed | Medium (low latency) | Slower than lighter models | Medium (low latency) |
| Input / Output Cost per 1M Tokens | $3 / $15 | $15 / $75 | $3 / $15 |
| Reasoning Performance | Very High | Very High | Very High |
| Coding Performance (on SWE-bench Verified) | 72.70% | 72.50% | 70.30% |
| Best For | maintaining efficiency and responsiveness in diverse internal and external scenarios | complex, long-running tasks and agent workflows | near-instant responses or extended, step-by-step thinking |
Best Cases to Use Claude Sonnet 4
Claude Sonnet 4 is best for providing steady performance for a wide range of everyday tasks.
- For students and learners: Use Claude Sonnet 4 to understand challenging topics, clarify questions quickly, and stay productive with clear, concise explanations across many subjects.
- For developers: Generate code, refine logic, and debug issues efficiently with a model designed for responsive, practical support in day-to-day development work.
- For businesses and teams: Create summaries, draft documents, and support decision-making with fast, reliable outputs that keep internal operations running smoothly.
- For product teams and app builders: Build responsive features or in-app helpers that interpret user intent clearly and deliver consistent results across varied use cases.
- For operations and support workflows: Provide quick resolutions, interpret user issues, and maintain service quality with a model that handles routine and unpredictable scenarios well.
- For content and marketing helpers: Draft copy, refine messaging, and transform ideas into clear content that keeps projects moving efficiently.
How to Access Claude Sonnet 4
Accessing Claude Sonnet 4 is simple, and you can choose the method that best matches your workflow.
1. Anthropic API
Claude Sonnet 4 is accessible through the official Anthropic API. With an API key and billing plan, developers can integrate the model directly into applications, tools, or custom intelligent systems.
2. EssayDone AI Chat
For quick access without any configuration, Claude Sonnet 4 is available through EssayDone AI Chat.
It delivers the same underlying model output through a clean, intuitive interface-perfect for students, creators, and professionals.
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FAQ
Here are some frequently asked questions about Claude Sonnet 4.
Yes. Claude Sonnet 4 provides higher reasoning capability, offering strong analytical performance suitable for complex and varied tasks. Its reasoning rating places it among the more advanced mid-to-upper models in the Claude lineup.
Claude Sonnet 4 costs $3 per 1M input tokens and $15 per 1M output tokens. It is priced as a strong mid-tier option, balancing capability and affordability.
Claude Sonnet 4 is optimized for maintaining efficiency and responsiveness in diverse internal and external scenarios. It performs well in mixed workloads, from structured problem-solving to conversational tasks. It is ideal for users who need reliable, versatile performance across different types of interactions.
Claude Sonnet 4 accepts text, code, and image inputs and produces text outputs. It handles multimodal analysis effectively for general reasoning and interpretation, while its primary strength remains high-quality text understanding.
Claude Sonnet 4 offers stronger reasoning and broader capabilities than Claude 3.5 Sonnet, making it a clear step up in performance. Claude Sonnet 4.5 adds further refinements with higher accuracy and more consistent outputs, while Sonnet 4 remains a balanced choice for versatile, high-quality tasks.
Using Claude Sonnet 4 in EssayDone AI Chat means you don't need an API key, don't face daily message limits, and aren't restricted by region. You can access ChatGPT and many other AI models on a single platform with one payment, all at a more affordable price.