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.
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.
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 base_url and model to use Claude in your existing OpenAI project—no code refactoring needed.
Get API Key
Register on Ace Data Cloud and obtain Bearer Token from the console
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.
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 CostFastest 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
Sonnet Series
Balanced ChoiceThe 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
FlagshipClaude 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 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
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
- ✓ Volume-based tiered discounts
- ✓ Priority support with account manager
- ✓ Custom rate limits
- ✓ SLA guarantees
- ✓ Private deployment solutions
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.