Claude 4.5 Sonnet API

The new standard for enterprise AI. Integrate the Claude 4.5 Sonnet API to power autonomous agents, complex reasoning, and real-time coding tasks with 64K output limits.

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Claude 4.5 Sonnet API — superior reasoning for scalable agents

Deploy Anthropic's most balanced model. With ~200K context and improved Computer Use, the Claude 4.5 Sonnet API delivers flagship intelligence at mid-tier latency.

What can you build with the Claude 4.5 Sonnet API?

Autonomous Agent Workflows

Orchestrate multi-step tasks using the Claude 4.5 Sonnet API's enhanced planning and 'Computer Use' capabilities.

Start Using API

Deep Analysis & Coding

Leverage 64K output tokens to generate full codebases or summarize vast datasets via the Claude 4.5 Sonnet API.

Start coding

High-Volume Automation

Replace brittle scripts with semantic reasoning. The Claude 4.5 Sonnet API offers the perfect price-performance ratio.

Scale now

Why developers choose the Claude 4.5 Sonnet API

Outperforming previous generations in reasoning benchmarks while maintaining the speed required for production applications.

Unmatched Coding & Logic

Scores significantly higher on SWE-bench, making it the top choice for engineering assistants.

Predictable JSON Outputs

Native support for structured outputs ensures your API integrations don't break.

Seamless Scalability

Same pricing tier as 3.5, allowing you to upgrade intelligence without increasing budget.

How to integrate the Claude 4.5 Sonnet API

Connect to the endpoint, define your schema, and deploy in minutes.

Step 1 — Authenticate

Generate your x-api-key and set the model header to `claude-4-5-sonnet` in your request.

Step 2 — Configure Context

Send up to 200K tokens of context, including documents or codebases, to the Claude 4.5 Sonnet API.

Step 3 — Execute Tools

Define tool definitions or JSON schemas. The model will strictly adhere to your format for reliable parsing.

Open API Playground

API Capabilities & Specs

Technical specifications for the Claude 4.5 Sonnet API

200K Context Window

Process large PDFs or code repos in a single API call.

64K Output Tokens

Generate long-form reports or complete modules.

Computer Use

Navigate UIs and screens via API (Beta).

Structured JSON

Guaranteed schema adherence for data pipelines.

Prompt Caching

Reduce costs by up to 90% for repetitive contexts.

Vision Analysis

Pixel-perfect chart and graph interpretation.

Claude 4.5 Sonnet API vs Other Models

Evaluating performance and cost efficiency

Model	Duration	Resolution	Price	Strength
Claude 4.5 Haiku	N/A	N/A	Low	Fastest option for simple tasks.
Claude 4.5 Sonnet	N/A	N/A	Mid	Top-tier coding & reasoning at mid-tier price.
Claude 4.5 Opus	N/A	N/A	High	Maximum depth for open-ended research.

Frequently Asked Questions

It maintains the competitive pricing of $3 per million input tokens and $15 per million output tokens, offering superior intelligence at the same cost.

Simply update your API model parameter to the latest alias. No code changes are required for standard prompts, though tool definitions may perform even better.

Yes, it features improved tool use reliability and can handle complex, multi-step agentic workflows with fewer errors.

The Claude 4.5 Sonnet API supports extended output generation up to 64,000 tokens, ideal for writing full documents or code files.

Yes, prompt caching is fully supported, allowing significant latency and cost reductions for long-context tasks.