overview changedcli-sdks-libraries/overview
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57Each major version of a client SDK sends one [API version](https://platform.claude.com/docs/en/api/versioning) by default, and a new major version comes with each new API version. To move to `2026-10-21`, see [Upgrade to 2026-10-21](https://platform.claude.com/docs/en/api/migration-2026-10-21#upgrade).
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5759## Latest versions
5860
5961| Tool | Latest version | Package |
6062| ---------- | -------------- | ----------------------------------------------------------------------------------------------------- |
61| ant CLI | `1.44.0` | [`github.com/anthropics/anthropic-cli`](https://github.com/anthropics/anthropic-cli/releases) |
63| ant CLI | `2.0.0` | [`github.com/anthropics/anthropic-cli`](https://github.com/anthropics/anthropic-cli/releases) |
6264| Python | `2.0.0` | [`anthropic`](https://pypi.org/project/anthropic/) |
6365| TypeScript | `1.0.0` | [`@anthropic-ai/sdk`](https://www.npmjs.com/package/@anthropic-ai/sdk) |
6466| C# | `13.0.0` | [`Anthropic`](https://www.nuget.org/packages/Anthropic) |
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