---
title: Anthropic: Claude Sonnet 4.5 | Text Generation | ModelsLab
description: Hybrid reasoning large language model excelling in long-duration autonomous coding, multi-agent coordination, and complex tool use with a 200K token.
url: https://modelslab.com/models/anthropic/anthropic-claude-sonnet-4.5.md
canonical: https://modelslab.com/models/anthropic/anthropic-claude-sonnet-4.5
type: product
component: Playground/LLM/Index
generated_at: 2026-09-11T04:55:33.020117Z
---

Anthropic: Claude Sonnet 4.5
---

 [LLMs.txt](https://modelslab.com/models/anthropic/anthropic-claude-sonnet-4.5/llms.txt) [.md](https://modelslab.com/models/anthropic/anthropic-claude-sonnet-4.5.md)

Anthropic: Claude Sonnet 4.5
---

Choose a prompt below to get started or type your own message

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### Anthropic: Claude Sonnet 4.5

anthropic anthropic-claude-sonnet-4.5

Copy model ID

PricingInput $3.00 / 1M tokens

Output $15.00 / 1M tokens

API EndpointsOpenAI Compatible

`https://modelslab.com/api/v7/llm/chat/completions`Endpoint

Anthropic Compatible

`https://modelslab.com/api/v7/llm/v1/messages`Messages

`https://modelslab.com/api/v7/llm/v1/messages/count_tokens`Count Tokens

`https://modelslab.com/api/v7/llm/v1/models`Models

Use with Claude Code

cURL Example

ParametersSystem MessageYou are a helpful AI assistant specialized in providing accurate and detailed responses.

Temperature0.7

Max Tokens4000

Top P0.9

Frequency Penalty0

Presence Penalty0

Thinkinglow

lowmediumhigh

Deeper thinking spends more of the Max Tokens budget before the answer starts.

Model Info

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About Anthropic: Claude Sonnet 4.5
---

Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with...

### Technical Specifications

Model IDanthropic-claude-sonnet-4.5

CategoryLLM Models

TaskText Generation

Price$9 per million tokens

AddedNovember 3, 2025

### Key Features

- Chat completion and multi-turn conversation API
- Streaming response with token-by-token output
- Function calling and tool use support
- System prompts and role-based messaging
- JSON mode and structured output

### Quick Start

Integrate Anthropic: Claude Sonnet 4.5 into your application with a single API call. Get your API key from the [pricing page](https://modelslab.com/pricing) to get started.

PythonJavaScriptcURLPHP

```
<code>import requests
import json

url = "https://modelslab.com/api/v7/llm/chat/completions"

headers = {
    "Content-Type": "application/json"
}

data = {
        "model_id": "anthropic-claude-sonnet-4.5",
        "messages": [
            {
                "role": "user",
                "content": "Hello!"
            }
        ],
        "max_tokens": 1000,
        "key": "YOUR_API_KEY"
    }

try:
    response = requests.post(url, headers=headers, json=data)
    response.raise_for_status()  # Raises an HTTPError for bad responses (4XX or 5XX)
    result = response.json()
    print("API Response:")
    print(json.dumps(result, indent=2))
except requests.exceptions.HTTPError as http_err:
    print(f"HTTP error occurred: {http_err} - {response.text}")
except Exception as err:
    print(f"Other error occurred: {err}")</code>
```

### Pricing

Anthropic: Claude Sonnet 4.5 API costs $9 per million tokens. Pay only for what you use with no minimum commitments. [View pricing plans](https://modelslab.com/pricing)

### Use Cases

- AI chatbots and virtual assistants
- Code generation and developer tools
- Content writing and copywriting automation
- Data analysis, summarization, and extraction

[Learn more about Anthropic: Claude Sonnet 4.5](https://modelslab.com/anthropic-claude-sonnet-45) [Browse LLM Models](https://modelslab.com/models?feature=llmaster) [More from Anthropic](https://modelslab.com/models/open_router) [View Pricing](https://modelslab.com/pricing)

Anthropic: Claude Sonnet 4.5 FAQ
---

### What is Anthropic: Claude Sonnet 4.5?

Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with...

### How do I use the Anthropic: Claude Sonnet 4.5 API?

You can integrate Anthropic: Claude Sonnet 4.5 into your application with a single API call. Sign up on ModelsLab to get your API key, then use the model ID "anthropic-claude-sonnet-4.5" in your API requests. We provide SDKs for Python, JavaScript, and cURL examples in the API documentation.

### How much does Anthropic: Claude Sonnet 4.5 cost?

Anthropic: Claude Sonnet 4.5 costs $9 per million tokens. ModelsLab plans start at $21/month (Basic), and the $149/month Open Source plan includes unlimited generation on open-source models.

### What is the Anthropic: Claude Sonnet 4.5 model ID?

The model ID for Anthropic: Claude Sonnet 4.5 is "anthropic-claude-sonnet-4.5". Use this ID in your API requests to specify this model.

### Do I need a paid plan to use Anthropic: Claude Sonnet 4.5?

Yes. ModelsLab is subscription-based with no free tier — plans start at $21/month (Basic, 3,250 API calls). The $149/month Open Source Unlimited plan includes unlimited generation across open-source models; premium third-party models are billed per call from your wallet.

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*This markdown version is optimized for AI agents and LLMs.*

**Links:**
- [Website](https://modelslab.com)
- [API Documentation](https://docs.modelslab.com)
- [Blog](https://modelslab.com/blog)

---
*Generated by ModelsLab - 2026-09-11*