Claude API · Ace Data Cloud

Claude API：
Powerful AI Reasoning and Conversation

Easily integrate the full range of Claude models with OpenAI compatible format and Anthropic native format. Supports Extended Thinking, Tool Use, multimodal input, streaming—pay as you go, with prices as low as 20% of the official rate.

📄 View Documentation 💬 Chat Completions

🤖 28+ Model Variants 📡 3 API Interfaces 🧠 Extended Thinking 🔌 OpenAI Compatible

🤖

28+

Model Variants

📡

API Interfaces

💰

<20%

Official Price

⚡

∞

No Rate Limit

Why Use Claude Through Ace Data Cloud?

Anthropic's Claude is one of the most powerful AI models today, excelling in reasoning, programming, mathematics, and creative writing. However, using the Anthropic API directly may face high costs and strict rate limits.

Ace Data Cloud offers complete Claude API proxy services, with prices as low as 20% of the official rate, while providing OpenAI compatible format—allowing you to switch from OpenAI to Claude without modifying any code, or use both simultaneously.

All Features of Claude API

A complete API suite covering all capabilities of Claude, with two interface formats for you to choose from

🔌

OpenAI Compatible Format

Use Claude through the /v1/chat/completions interface, fully compatible with the OpenAI SDK. Switch from GPT to Claude without modifying your code.

📨

Anthropic Native Messages

Use the Anthropic native format through the /v1/messages interface, fully supporting all exclusive features of Claude, including Extended Thinking.

🧠

Extended Thinking

Enable Claude's deep reasoning mode—the model will engage in structured thinking before answering, significantly improving performance on complex reasoning, math, and programming tasks.

🛠️

Tool Use / Function Calling

Allow Claude to call the tools and functions you define. Both formats support the complete tool calling specification, building powerful AI Agents.

👁️

Multimodal Input

Supports mixed input of images + text. Claude can analyze images, read document screenshots, and understand charts—without additional OCR calls.

⚡

Streaming

Both formats support SSE streaming, returning generated content in real-time. Chat Completions and Messages API can use stream: true.

Python

from openai import OpenAI
client = OpenAI(
    api_key="YOUR_API_KEY",
    base_url="https://api.acedata.cloud/v1"
)
response = client.chat.completions.create(
    model="claude-sonnet-4-20250514",
    messages=[
        {"role": "system", "content": "You are a helpful assistant."},
        {"role": "user", "content": "Explain the basic principles of quantum computing"}
    ],
    stream=True
)
for chunk in response:
    if chunk.choices[0].delta.content:
        print(chunk.choices[0].delta.content, end="")

Response

{
  "id": "chatcmpl-abc123",
  "object": "chat.completion",
  "model": "claude-sonnet-4-20250514",
  "choices": [{
    "index": 0,
    "message": {
      "role": "assistant",
      "content": "Quantum computing utilizes quantum mechanics..."
    },
    "finish_reason": "stop"
  }],
  "usage": {
    "prompt_tokens": 28,
    "completion_tokens": 256,
    "total_tokens": 284
  }
}

OpenAI SDK One-Line Code Switch

Simply change base_url and model to use Claude in your existing OpenAI project—no code refactoring needed.

Get API Key

Modify base_url

Set base_url to https://api.acedata.cloud/v1

Select Claude Model

Change the model parameter to any Claude model name, such as claude-sonnet-4-20250514

Two API formats, choose as needed

OpenAI compatible format allows seamless switching, Anthropic native format unleashes full capabilities

Function	Chat Completions	Messages API
API Path	`/v1/chat/completions`	`/v1/messages`
OpenAI SDK Compatible	✓	✗
Anthropic SDK Compatible	✗	✓
Streaming	✓	✓
Tool Use / Function Calling	✓	✓
Multimodal Input (Vision)	✓	✓
Extended Thinking	✗	✓
Token Count	✗	✓
System Prompt	✓ (messages array)	✓ (independent system field)

What can be built using the Claude API?

From intelligent conversations to complex reasoning—developers are building these applications with Claude

💬

AI Conversation Assistant

Build intelligent customer service, personal assistants, or knowledge Q&A systems, leveraging Claude's exceptional language understanding and generation capabilities

💻

Programming Assistance

Code generation, review, debugging, and refactoring. Claude excels in programming tasks, supporting all major languages

📊

Data Analysis

Document parsing, data extraction, report generation. Multimodal input allows Claude to directly analyze charts and screenshots

🤖

AI Agent

Build autonomous agents and automate workflows through Tool Use. Claude can call APIs, query databases, and perform complex tasks

Quick Start in 3 Steps

From registration to sending your first Claude message, it takes less than 3 minutes

Register and Get API Key

Create a free account on Ace Data Cloud and generate your Bearer Token from the console.

Select API Format

Quickly access using OpenAI compatible Chat Completions, or unlock all features using Anthropic native Messages API.

Start the Conversation

Send your first message and experience Claude's powerful reasoning capabilities. Supports streaming for real-time responses.

View Documentation →

Why choose Ace Data Cloud instead of using Anthropic directly?

Comprehensive advantages in pricing, rate limits, and compatibility

Comparison Dimension	Ace Data Cloud	Direct Anthropic
Price	As low as 20% off official pricing	Official pricing
Rate Limit	✓ Ample concurrent quota	✗ Strict limits (Tier dependent)
OpenAI Compatible Format	✓	✗
Anthropic Native Format	✓	✓
Extended Thinking	✓	✓
Tool Use	✓	✓
Globally Available	✓ Ready to use	✗ Limited in some regions
Pay-as-you-go	✓ Flexible top-up	Monthly billing
Claude Code Integration	✓	✓

Select the Suitable Model Series

From lightweight and fast to top-tier reasoning—Claude offers a multi-level model selection

Haiku Series

High Speed and Low Cost

Fastest response speed and lowest cost. Suitable for simple tasks, high concurrency scenarios, and latency-sensitive applications.

✓ Claude 3 Haiku / Claude 3.5 Haiku
✓ Claude Haiku 4.5 (latest)
✓ Millisecond-level response speed
✓ Lowest cost Claude model
✓ Suitable for classification, extraction, simple Q&A

Recommended

Sonnet Series

Balanced Choice

The best balance of performance and cost. Suitable for most production-level applications, with excellent reasoning capabilities and reasonable pricing.

✓ Claude 3.5 Sonnet / Claude 3.7 Sonnet
✓ Claude Sonnet 4 / Claude Sonnet 4.5 (latest)
✓ Excellent programming and reasoning capabilities
✓ Supports Extended Thinking
✓ Most popular choice among developers

Fable / Opus Series

Flagship

Claude Fable 5 is the latest flagship for long-range agents and complex reasoning, while the Opus series continues to cover high-intensity analytical tasks.

✓ Claude Fable 5 (latest flagship, 1 million Token context)
✓ Claude 3 Opus / Opus 4 / Opus 4.1
✓ Claude Opus 4.5 / Opus 4.6 / Opus 4.7 / Opus 4.8
✓ Strongest reasoning and analytical capabilities
✓ Supports Extended Thinking
✓ Suitable for research, complex programming, deep analysis

claude-fable-5 claude-sonnet-4-20250514 claude-opus-4-6 claude-opus-4-7 claude-opus-4-8 claude-3-7-sonnet-thinking claude-haiku-4-5-20251001 claude-opus-4-5-20251101

Claude API Pricing

Charged by Token usage, with prices as low as 20% of the official Anthropic price. No subscription fees, no hidden costs.

Bulk packages can enjoy more discounts

Pay-as-you-go

Token Billing

<20% Official Price

Charged based on actual Token usage, with separate pricing for input and output

✓ Haiku Series: Lowest cost entry
✓ Sonnet Series: Best value choice
✓ Opus Series: Flagship reasoning capability
✓ Supports all 28+ model variants
✓ Extended Thinking Token at the same price
✓ Streaming — Free
✓ Token counting — Free

View Pricing Details

Enterprise Edition

Custom

Exclusive plans for high-usage teams

✓ Volume-based tiered discounts
✓ Priority support with account manager
✓ Custom rate limits
✓ SLA guarantees
✓ Private deployment solutions

Contact Sales

Frequently Asked Questions

Everything you need to know about using the Claude API

What is the difference between using the Anthropic API directly? ▾

Ace Data Cloud is a proxy service for the Anthropic Claude API. We provide the exact same Claude models and capabilities, but at prices as low as 20% of the official rates, and additionally support OpenAI compatible formats. Your requests are ultimately processed by Anthropic's Claude model, ensuring identical quality.

Does it support OpenAI SDK? ▾

Yes! Our Chat Completions API is fully compatible with the OpenAI SDK (Python, Node.js, Go, etc.). Just modify base_url to https://api.acedata.cloud/v1, and set the model to the Claude model name. Your existing OpenAI code requires almost no modifications.

Which Claude models are supported? ▾

We support Claude Fable 5, as well as the full range of Haiku, Sonnet, and Opus models. Fable 5 is designed for the most complex long-range reasoning and agent tasks, supporting a context of 1 million tokens; other series cover different scenarios from low latency to high-intensity analysis.

What is Extended Thinking? ▾

Extended Thinking is Claude's deep reasoning mode. When enabled, the model undergoes a structured thinking process before answering, similar to humans' "think before speaking." This significantly enhances performance in tasks such as mathematics, logical reasoning, and complex programming. It can be enabled through the thinking parameter in the Messages API, or by directly using model names with the -thinking suffix.

Can it be used for Claude Code? ▾

Yes! Ace Data Cloud's Claude API can directly provide backend support for Claude Code. Just set the API base URL and Token in the Claude Code configuration to use it, enjoying prices as low as 20% of the official rates and ample concurrency limits. See our Claude Code configuration tutorial for details.

What is the pricing model? ▾

Billing is based on token usage, with separate pricing for input tokens and output tokens. Prices vary by model—Haiku is the cheapest, and Opus is the most expensive. No subscription fees, no monthly fees, pay only for what you use. Available immediately after recharge, and the balance never expires. Bulk packages can enjoy further discounts.

Is there a rate limit? ▾

Compared to the strict rate limits for new accounts set by Anthropic (which require a gradual increase in Tier), Ace Data Cloud offers much more generous concurrency limits. You don't have to worry about being throttled during peak times, nor do you need to prepay a large amount to upgrade your Tier.

Does it support multimodal input? ▾

Yes. Both Chat Completions and Messages API support mixed input of images + text. You can attach Base64 encoded images or image URLs in your messages, and Claude will understand the image content and respond in conjunction with the text. JPEG, PNG, GIF, and WebP formats are supported.

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Get Started with Claude API Now

Join thousands of developers to use the full range of Claude models at prices as low as 20% of the official rate. Pay as you go - no subscription fees, no commitments.

📄 Messages API Documentation → 💬 Chat Completions Documentation

Claude API： Powerful AI Reasoning and Conversation

claude-sonnet-4-6

Quickstart

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