# Anthropic TypeScript SDK v0.100.0 — sdk: v0.100.0

- Product: Anthropic TypeScript SDK (https://whatsnew.fyi/product/anthropic-sdk-typescript)
- Vendor: Anthropic
- Date: 2026-05-28
- Version: v0.100.0
- Original notes: https://github.com/anthropics/anthropic-sdk-typescript/releases/tag/sdk-v0.100.0
- Permalink: https://whatsnew.fyi/product/anthropic-sdk-typescript/releases/v0.100.0

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **added** — Add support for claude-opus-4-8 model
- **added** — Add support for mid-conversation system blocks
- **added** — Add usage.output_tokens_details field

##### 0.100.0 (2026-05-28)

Full Changelog: [sdk-v0.99.0...sdk-v0.100.0](https://github.com/anthropics/anthropic-sdk-typescript/compare/sdk-v0.99.0...sdk-v0.100.0)

###### Features

* **api:** Add support for claude-opus-4-8, mid-conversation system blocks, and usage.output_tokens_details ([bb0bf27](https://github.com/anthropics/anthropic-sdk-typescript/commit/bb0bf278ea0afdf383b6ea711cadf3ab788ea84a))


###### Documentation

* replace literal newlines ([66ba142](https://github.com/anthropics/anthropic-sdk-typescript/commit/66ba1421737231e50bcef295b4437ce60cc90be2))