Claude 4.1 Opus (API)

Deploy Anthropic’s most capable AI. The Claude 4.1 Opus API delivers hybrid reasoning, precision coding, and reliable agentic control for mission-critical applications.

Playground Not Available

This feature is currently only available for selected image and video generation models.

Build with Claude 4.1 Opus API — Maximum Intelligence

Empower your agents with the hardest working model. Perfect for multi-step reasoning, secure enterprise deployments, and complex tool orchestration.

What can the Claude 4.1 Opus API achieve?

Deep Reasoning Engines

Solve complex legal and financial challenges with the Claude 4.1 Opus API, designed for extended thought processes.

Explore reasoning

Autonomous Agents

Orchestrate reliable workflows. Opus 4.1 excels at managing multi-turn state and executing precise tool calls.

Build agents

Enterprise Engineering

Leverage the API for massive code refactoring and data science tasks requiring formal logic and zero-shot accuracy.

Start coding

Why developers choose Claude 4.1 Opus API

When accuracy is non-negotiable, the Claude 4.1 Opus API provides the stability and intelligence needed for production-grade software.

Unmatched Precision

The highest reasoning score in the Claude family, minimizing hallucinations in critical APIs.

Agentic Reliability

Designed for loops where structured JSON outputs must stay valid over long conversations.

Safety First

Anthropic’s leading safeguards make it the trusted choice for regulated industries.

How to integrate Claude 4.1 Opus API

Launch sophisticated AI applications in three steps via EvoLink.

Step 1 — Authenticate & Configure

Connect to EvoLink and select `claude-opus-4.1` as your target model ID for flagship performance.

Step 2 — Design System Prompts

Define robust role constraints and operational boundaries to leverage Opus’s instruction-following capability.

Step 3 — Implement Tool Use

Send JSON schemas to the API. Claude 4.1 Opus will autonomously select and populate tools to execute tasks.

View API Docs

Core API Capabilities

Technical specs for the Claude 4.1 Opus API

Intelligence

Hybrid Reasoning

Dynamically balances fast responses with deep thought.

Integration

Structured Outputs

Native support for complex JSON and function calling.

Capacity

200k Context Window

Process vast datasets or entire codebases in one call.

Security

Enterprise Safety

Aligned with Constitutional AI for safe deployment.

Global

Global Polyglot

Fluent generation in English, Chinese, and 50+ languages.

Compliance

High Fidelity

Follows complex formatting rules without degradation.

Claude 4.1 Opus vs Other Models

Selecting the right API for your needs

Model	Duration	Resolution	Price	Strength
Claude 4.1 Opus	N/A	Flagship	Premium	Unrivaled reasoning depth, autonomous planning, and complex coding.
Claude 4.5 Sonnet	N/A	High	Mid-Range	Excellent balance of intelligence and speed for scaling tasks.
Claude 4.5 Haiku	N/A	Standard	Low	Ultra-fast response times for simple chatbots and volume processing.

Claude 4.1 Opus API - FAQ

Everything you need to know about the product and billing.

Choose the Claude 4.1 Opus API when your application requires the absolute highest level of reasoning, complex planning, or high-stakes decision making where cost is secondary to accuracy.

Yes, it supports the same tool-use (function calling) definitions as previous versions but offers significantly higher reliability in parameter generation.

The model supports a 200,000 token context window, allowing for deep analysis of large documents, legal contracts, or extensive conversation histories.

EvoLink provides optimized routing to manage throughput, ensuring your enterprise applications maintain uptime even during peak usage of the Opus model.

Absolutely. It is the preferred model for autonomous coding agents (like Devin or OpenDevin style architectures) due to its ability to plan multi-step refactors.