回退机制扩展：客户端侧回退信用令牌类型得到扩展，同时新增服务器端回退默认选项，提升 API 调用的容错性
▸ Release Notes 英文原文（698 字符）
## 0.120.0 (2026-07-24)
Full Changelog: [v0.119.0...v0.120.0](https://github.com/anthropics/anthropic-sdk-python/compare/v0.119.0...v0.120.0)
### Features
* **api:** add claude-opus-5 model ([bf4e31c](https://github.com/anthropics/anthropic-sdk-python/commit/bf4e31c17c43ba2b409bec57e1856b025d159f1a))
* **api:** add tool addition/removal blocks and tool_change events ([bf4e31c](https://github.com/anthropics/anthropic-sdk-python/commit/bf4e31c17c43ba2b409bec57e1856b025d159f1a))
* **api:** expand client-side fallback credit token types and add server-side fallbacks default option ([bf4e31c](https://github.com/anthropics/anthropic-sdk-python/commit/bf4e31c17c43ba2b409bec57e1856b025d159f1a))
▸ 主项目介绍 · anthropics/anthropic-sdk-python
▸ README 原文（同步于 2026-07-19 13:24）
# Claude SDK for Python
[](https://pypi.org/project/anthropic/)
The Claude SDK for Python provides access to the [Claude API](https://docs.anthropic.com/en/api/) from Python applications.
## Documentation
Full documentation is available at **[platform.claude.com/docs/en/api/sdks/python](https://platform.claude.com/docs/en/api/sdks/python)**.
## Installation
```sh
pip install anthropic
```
## Getting started
```python
import os
from anthropic import Anthropic
client = Anthropic(
api_key=os.environ.get("ANTHROPIC_API_KEY"), # This is the default and can be omitted
)
message = client.messages.create(
max_tokens=1024,
messages=[
{
"role": "user",
"content": "Hello, Claude",
}
],
model="claude-opus-4-6",
)
print(message.content)
```
## Requirements
Python 3.9+
## Contributing
See [CONTRIBUTING.md](./CONTRIBUTING.md).
## License
This project is licensed under the MIT License. See the [LICENSE](LICENSE) file for details.