Claude API:
Powerful AI Reasoning and Dialogue
Easily integrate the full range of Claude models with OpenAI compatible formats and Anthropic native formats. Supports Extended Thinking, Tool Use, multimodal input, streaming—pay-as-you-go, at less than half the official price. ```
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 at a price less than half of the official price, while providing OpenAI compatible formats—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 code.
Anthropic Native Messages
Use Anthropic native format through the /v1/messages interface, fully supporting all Claude exclusive features, 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, mathematics, and programming tasks.
Tool Use / Function Calling
Allow Claude to call tools and functions you define. Both formats support complete tool calling specifications, 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.
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="")
{
"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 the base_url and model to use Claude in your existing OpenAI project—no code refactoring required.
Get API Key
Register on Ace Data Cloud and obtain the Bearer Token from the console
Modify base_url
Set the 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 for seamless switching, Anthropic native format unleashes full capabilities
| Functionality | 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 Counting | ✗ | ✓ |
| System Prompt | ✓ (messages array) | ✓ (independent system field) |
What Can Be Built Using 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
3 Steps to Get Started Quickly
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 use Anthropic native Messages API to unlock all features.
Start the Conversation
Send your first message and experience Claude's powerful reasoning capabilities. Streaming support for real-time responses.
Why Choose Ace Data Cloud Instead of Directly Using Anthropic?
Comprehensive advantages in pricing, rate limits, and compatibility
| Comparison Dimension | Ace Data Cloud | Direct Anthropic |
|---|---|---|
| Price | Less than 50% of official | Official pricing |
| Rate Limits | ✓ Ample concurrent quota | ✗ Strict limits (Tier dependent) |
| OpenAI Compatible Format | ✓ | ✗ |
| Anthropic Native Format | ✓ | ✓ |
| Extended Thinking | ✓ | ✓ |
| Tool Use | ✓ | ✓ |
| Global Availability | ✓ Out of the box | ✗ Limited in some regions |
| Pay-as-you-go | ✓ Flexible top-up | Monthly billing |
| Claude Code Integration | ✓ | ✓ |
Select the Right Model Series
From lightweight and fast to top-tier reasoning—Claude offers a multi-tier model selection
Haiku Series
High Speed, Low CostFastest response time, 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
Sonnet Series
Balanced ChoiceThe best balance of performance and cost. Suitable for most production-level applications, with excellent reasoning capabilities at a reasonable price.
- ✓ 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
Opus Series
FlagshipClaude's most powerful model series, with top-tier reasoning and analytical capabilities. Suitable for the most complex tasks.
- ✓ Claude 3 Opus / Opus 4 / Opus 4.1
- ✓ Claude Opus 4.5 / Opus 4.6 (latest)
- ✓ Strongest reasoning and analytical capabilities
- ✓ Supports Extended Thinking
- ✓ Suitable for research, complex programming, deep analysis
Claude API Pricing
Charged based on token usage, prices are less than half of Anthropic's official rates. No subscription fees, no hidden costs.
Bulk packages offer additional discounts
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
Exclusive plans for high-usage teams
- ✓ Tiered discounts based on usage
- ✓ Priority support with account manager
- ✓ Custom rate limits
- ✓ SLA guarantees
- ✓ Private deployment options
Frequently Asked Questions
Everything you need to know about using the Claude API
What is the difference between using Anthropic API directly? ▾
Ace Data Cloud is a proxy service for Anthropic Claude API. We provide the exact same Claude models and capabilities, but at less than half the official price, with additional support for OpenAI compatible formats. Your requests are ultimately processed by Anthropic's Claude models, ensuring identical quality.
Is OpenAI SDK supported? ▾
Yes! Our Chat Completions API is fully compatible with OpenAI SDK (Python, Node.js, Go, etc.). Simply change the base_url to https://api.acedata.cloud/v1 and set the model to the Claude model name. Your existing OpenAI code requires almost no modification.
Which Claude models are supported? ▾
We support the entire range of Claude models, including: Haiku series (3, 3.5, 4.5), Sonnet series (3, 3.5, 3.7, 4, 4.5), Opus series (3, 4, 4.1, 4.5, 4.6), totaling 28+ model variants. The Thinking versions of each series are also fully supported. We will follow up promptly after Anthropic releases new models.
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 "thinking before speaking." This significantly enhances performance in tasks involving 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. Set the API base URL and Token in the Claude Code configuration to use it, enjoying prices below half of the official rates and ample concurrent quotas. See our Claude Code Configuration Tutorial for details.