sdk-v0.135.0
Anthropic TypeScript SDK v0.135.0 adds support for 'speed' parameters and usage tracking in Messages, updates model capabilities for tool thinking, exposes Console spend limits, and fixes stream handling bugs.
Why this signal matters
Anthropic TypeScript SDK v0.135.0 introduces several API-level updates and client-level bug fixes. Key additions include the speed parameter and corresponding usage.speed field in the Messages API, alongside documentation noting that specific models require a beta header to access speed . The update adds 'between tools' thinking types to model capabilities and exposes Console organization usage-tier spend caps as read-only spend limits. For client reliability, the release ensures streams dropped before being fully read are properly closed and keeps unread JSONL responses open while held.
Actionable summary
Anthropic TypeScript SDK release v0.135.0 introduces the speed parameter and usage.speed property in Messages (with documentation noting required beta headers for some models), updates model capability types with between tools thinking, surfaces Console usage-tier spend caps, and fixes client issues with prematurely dropped streams and unread JSONL responses.
- Agent usefulness
- 94/100
- Confidence
- 96%
- Canonical data
- JSON + Markdown
What builders should check
- Upgrade to Anthropic TypeScript SDK v0.135.0 if using the new speed parameter or usage.speed telemetry.
- Verify beta header requirements when using the speed parameter with supported models.
- Inspect model capabilities integration if relying on tool-related thinking types.