Claude 4.5 Opus (API)

Access Anthropic's most capable AI model. Claude 4.5 Opus delivers exceptional reasoning, coding excellence, and reliable agentic behavior for the most demanding applications.

Playground Not Available

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

Build with Claude 4.5 Opus API — Ultimate Intelligence

Deploy the most sophisticated AI capabilities. Perfect for complex reasoning, autonomous agents, and mission-critical applications requiring the highest accuracy.

What can Claude 4.5 Opus API achieve?

Exceptional Reasoning

Tackle the most complex analytical challenges. Claude 4.5 Opus excels at multi-step reasoning, logical analysis, and nuanced decision-making.

Explore reasoning

Elite Code Generation

Generate production-quality code across any language. From architecture design to implementation, Opus delivers code that works.

Test coding

Autonomous Agents

Build reliable AI agents that can plan, execute, and self-correct. Claude 4.5 Opus maintains coherent state across complex multi-turn workflows.

Build agents

Why developers choose Claude 4.5 Opus API

When you need the absolute best AI capabilities, Claude 4.5 Opus delivers uncompromising performance for the most demanding applications.

Unmatched Intelligence

The most capable Claude model with superior reasoning, creativity, and analytical abilities.

Agentic Excellence

Designed for autonomous workflows with reliable tool use, planning, and self-correction.

Safety First

Anthropic's Constitutional AI ensures safe, aligned behavior even for sensitive applications.

How to integrate Claude 4.5 Opus API

Start using Claude 4.5 Opus through EvoLink's unified gateway in three steps.

Step 1 — Get Your API Key

Step 2 — Configure Your Client

Use the Anthropic SDK or OpenAI-compatible endpoint. Specify `claude-opus-4.5` as the model.

Step 3 — Deploy Excellence

Build your most ambitious AI applications with the most capable model in the Claude family.

View API Docs

Core API Capabilities

Technical specifications for Claude 4.5 Opus API

Capacity

200K Context

Process large documents and maintain coherent long conversations.

Efficiency

Prompt Caching

Reduce costs on repeated system prompts and examples.

Integration

Tool Use

Reliable function calling for agentic applications.

Multimodal

Vision

Analyze images and documents with exceptional accuracy.

Reliability

JSON Mode

Guaranteed valid structured outputs.

Intelligence

Extended Thinking

Deep reasoning for complex problems.

Claude 4.5 Opus vs Other Models

Choose the right model for your needs

Model	Duration	Resolution	Price	Strength
Claude 4.5 Opus	N/A	200K Context	Premium	Unmatched reasoning, elite coding, agentic excellence.
Claude 4.5 Sonnet	N/A	200K Context	Mid-Range	Excellent balance of capability and cost for scaling.
GPT-5.1	N/A	400K Context	Premium	Largest context window, strong general capabilities.

Claude 4.5 Opus API - FAQ

Everything you need to know about the product and billing.

Claude 4.5 Opus represents Anthropic's latest flagship model with improved reasoning, coding abilities, and agentic capabilities compared to the 4.1 version.

Claude 4.5 Opus supports a 200,000 token context window, enabling analysis of large documents and extended conversations.

Claude 4.5 Opus supports prompt caching with separate pricing for cache writes and cache hits. Cache hits cost approximately 90% less than regular input tokens.

Yes, Claude 4.5 Opus is specifically designed for agentic applications with reliable tool use, consistent behavior, and self-correction capabilities.

Choose Opus when you need the absolute highest quality for complex reasoning, coding, or agentic tasks. Choose Sonnet for better cost-efficiency on high-volume workloads.