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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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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).
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 [Switch to 2026-10-21](https://platform.claude.com/docs/en/api/migration-2026-10-21#upgrade).
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5959## Latest versions
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61| Tool | Latest version | Package |
62| ---------- | -------------- | ----------------------------------------------------------------------------------------------------- |
63| ant CLI | `2.1.0` | [`github.com/anthropics/anthropic-cli`](https://github.com/anthropics/anthropic-cli/releases) |
64| Python | `2.1.0` | [`anthropic`](https://pypi.org/project/anthropic/) |
65| TypeScript | `1.1.0` | [`@anthropic-ai/sdk`](https://www.npmjs.com/package/@anthropic-ai/sdk) |
66| C# | `13.1.0` | [`Anthropic`](https://www.nuget.org/packages/Anthropic) |
67| Go | `2.1.0` | [`github.com/anthropics/anthropic-sdk-go`](https://pkg.go.dev/github.com/anthropics/anthropic-sdk-go) |
68| Java | `3.1.0` | [`com.anthropic:anthropic-java`](https://central.sonatype.com/artifact/com.anthropic/anthropic-java) |
69| PHP | `1.1.0` | [`anthropic-ai/sdk`](https://packagist.org/packages/anthropic-ai/sdk) |
70| Ruby | `2.1.0` | [`anthropic`](https://rubygems.org/gems/anthropic) |
61| Tool | Latest version | Package |
62| ---------- | -------------- | ----------------------------------------------------------------------------------------------------------- |
63| ant CLI | `2.1.0` | [`github.com/anthropics/anthropic-cli`](https://github.com/anthropics/anthropic-cli/releases) |
64| Python | `2.1.0` | [`anthropic`](https://pypi.org/project/anthropic/) |
65| TypeScript | `1.1.0` | [`@anthropic-ai/sdk`](https://www.npmjs.com/package/@anthropic-ai/sdk) |
66| C# | `13.1.0` | [`Anthropic`](https://www.nuget.org/packages/Anthropic) |
67| Go | `2.1.0` | [`github.com/anthropics/anthropic-sdk-go/v2`](https://pkg.go.dev/github.com/anthropics/anthropic-sdk-go/v2) |
68| Java | `3.1.0` | [`com.anthropic:anthropic-java`](https://central.sonatype.com/artifact/com.anthropic/anthropic-java) |
69| PHP | `1.1.0` | [`anthropic-ai/sdk`](https://packagist.org/packages/anthropic-ai/sdk) |
70| Ruby | `2.1.0` | [`anthropic`](https://rubygems.org/gems/anthropic) |
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7272The same versions are available as JSON at `https://platform.claude.com/docs/sdk-versions.json`.
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