// event · sdk
Anthropic TypeScript SDK v0.135.0 adds speed parameter and between_tools thinking
sdkvendor: anthropicpublished: 2h agoconfidence: 0.85id: 220bb9f4-0a6f-4ed4-ba48-580c16be0562
The Anthropic TypeScript SDK v0.135.0 adds a new `speed` parameter (and `usage.speed`) to Messages, exposes `between_tools` thinking types in model capabilities, and surfaces a Console organization's usage-tier spend cap as a read-only spend limit. Also includes stream-handling fixes to avoid dropping unread streams and keep JSONL responses open while in use.
capability delta
An agent can now request a `speed` tier on Anthropic Messages calls, observe `usage.speed` in responses, and emit `between_tools` extended thinking between tool calls via the TypeScript SDK.
curator note
Minor-feature SDK bump: `speed` parameter and `between_tools` thinking are the agent-relevant additions; some models require a beta header to use `speed`.
// install
npm i @anthropic-ai/sdk@0.135.0npm · @anthropic-ai/sdk @ 0.135.0
// example
typescript
import Anthropic from "@anthropic-ai/sdk";
const client = new Anthropic();
const msg = await client.messages.create({
model: "claude-sonnet-4-5",
max_tokens: 1024,
// New in 0.135.0: request a speed tier (some models require a beta header)
speed: "fast",
messages: [{ role: "user", content: "Summarize the latest release notes." }],
});
console.log(msg.usage.speed); // new usage.speed field
console.log(msg.content);
// links