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Claude Opus 4.1: Improved Coding, Reasoning, and Agentic Performance
Released on August 5, 2025 as part of the Claude Opus lineup, Claude Opus 4.1 sits alongside Claude Haiku 4.5 and is positioned as an updated flagship model with enhanced capabilities across coding, reasoning, and agentic tasks.
Designed for workflows that rely on research, data analysis, and tool-assisted reasoning, it delivers stronger performance and more reliable depth than earlier versions. These improvements make it an excellent choice for complex analytical projects, advanced problem solving, and scenarios that require precise, high-level intelligence supported by external tools.
Claude Opus 4.1: Key Specs
Below are Claude Opus 4.1's main specs and how they translate into real-world behavior.
- Context Window - 200,000 tokens: This wide context capacity enables Claude Opus 4.1 to manage long conversations or large documents while maintaining clear continuity across complex, multi-step tasks.
- Maximum Output Length - 32,000 tokens: The model can produce substantial and detailed responses, supporting comprehensive explanations, well-structured reports, and extended content created in a single pass.
- Speed and Efficiency - Moderately slow, deliberate performance: It generates responses at a steady, thoughtful pace, making Claude Opus 4.1 suitable for tasks where depth and careful reasoning take priority over speed.
- Cost Efficiency - Positioned in a premium usage tier: Its higher operating cost reflects the model's advanced capabilities, making it ideal for high-value use cases where top-tier reliability is essential.
- Reasoning and Accuracy - Highest-level reasoning performance: Claude Opus 4.1 handles complex logic, analytical tasks, and demanding problem-solving with exceptional clarity and precision.
- Multimodal Capabilities - Supports text, code, and image input, outputs text: It can interpret diagrams, screenshots, and code snippets together with written prompts, producing coherent text responses from mixed media.
Compare Claude Opus 4.1, Claude Opus 4, and Claude Sonnet 4
A brief overview of how each model differs in power, speed, and use cases.
| Feature | Claude Opus 4.1 | Claude Opus 4 | Claude Sonnet 4 |
|---|---|---|---|
| Knowledge Cutoff | Mar 2025 | Mar 2025 | Mar 2025 |
| Context Window (Tokens) | 200,000 | 200,000 | 1,000,000 |
| Max Output Tokens | 32,000 | 32,000 | 64,000 |
| Input Modalities | Text, Code, Image | Text, Code, Image | Text, Code, Image |
| Output Modalities | Text | Text | Text |
| Latency (OpenRouter Data) | 1.78s | 2.82s | 1.06s |
| Speed | Slower than lighter models | Slower than lighter models | Medium (low latency) |
| Input / Output Cost per 1M Tokens | $15 / $75 | $15 / $75 | $3 / $15 |
| Reasoning Performance | Highest | Very High | Very High |
| Coding Performance (on SWE-bench Verified) | 74.50% | 72.50% | 72.70% |
| Best For | tasks involving research, data analysis, and tool-assisted reasoning | complex, long-running tasks and agent workflows | maintaining efficiency and responsiveness in diverse internal and external scenarios |
Best Cases to Use Claude Opus 4.1
Claude Opus 4.1 is best for offering clear, structured thinking for detailed and information-heavy tasks.
- For students and learners: Use Claude Opus 4.1 to break down research topics, understand data-driven explanations, and follow step-by-step reasoning that strengthens comprehension of complex material.
- For developers: Analyze algorithms, work with structured datasets, and build tools that rely on accurate, tool-assisted reasoning for technical workflows.
- For businesses and teams: Generate data-backed insights, review research materials, and create clear summaries that support informed decision-making across analytical projects.
- For product teams and app builders: Develop features that integrate research workflows, data handling, or tool usage, enabling smarter and more capable product experiences.
- For operations and support workflows: Interpret logs or system data, troubleshoot multi-step issues, and generate detailed, reliable guidance for complex support scenarios.
- For content and marketing helpers: Translate research findings or analytical content into clear, approachable messaging that improves understanding for broader audiences.
How to Access Claude Opus 4.1
You can use Claude Opus 4.1 through the official Anthropic API. This requires an API key and an active billing plan, making it ideal for developers who need high-level control and want to integrate the model into apps, workflows, or automated systems.
1. Anthropic API
You can use Claude Opus 4.1 through the official Anthropic API. This requires an API key and an active billing plan, making it ideal for developers who need high-level control and want to integrate the model into apps, workflows, or automated systems.
2. EssayDone AI Chat
For instant, no-setup access, Claude Opus 4.1 is available in EssayDone AI Chat.
It provides the same model capabilities as the API but in an easy, user-friendly interface suited for writing, research, and professional tasks.
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FAQ
Here are some frequently asked questions about Claude Opus 4.1.
Yes. Claude Opus 4.1 offers the highest level of reasoning capability, delivering exceptional depth and accuracy on complex analytical tasks. It represents one of the most advanced reasoning models available.
Claude Opus 4.1 costs $15 per 1M input tokens and $75 per 1M output tokens. It is priced at the premium tier, consistent with its top-end performance.
Claude Opus 4.1 is optimized for tasks involving research, data analysis, and tool-assisted reasoning. It excels in extended workflows that require precise, multi-step thinking and high reliability. It is ideal for advanced professional and analytical use cases.
Claude Opus 4.1 accepts text, code, and image inputs and produces text outputs. Its multimodal support enables strong interpretation and reasoning across different content types, with particular strength in complex text and code analysis.
Claude Opus 4.1 improves upon Claude 3 Opus with significantly stronger reasoning and more stable, accurate outputs. Compared to Claude Opus 4, it offers enhanced efficiency, faster processing, and more consistent results, making it the most capable model in the Opus series.
Using Claude Opus 4.1 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.