# Anthropic Python SDK v1.15.0

Category: model-behavior
Published: 2026-10-15T19:45:15Z
Source: [Anthropic Python SDK releases](https://github.com/anthropics/anthropic-sdk-python/releases/tag/v1.15.0)
Agent usefulness: 94/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-10-16T00:17:49.501Z
Tags: anthropic, sdk, python

## Human Summary
Anthropic Python SDK v1.15.0 introduces support for the 'speed' parameter, between-tools thinking types, and spend limit attributes.

## Agent Summary
Anthropic Python SDK release v1.15.0 adds between-tools thinking types, updates Messages API with 'speed' parameter and 'usage.speed', exposes read-only spend limits for Console orgs, and documents required beta headers for speed features.

## Body
Anthropic released version 1.15.0 of its Python SDK. Key API updates include adding 'between tools' to thinking types within model capabilities, introducing the 'speed' parameter and 'usage.speed' metric to Messages, and exposing an organization's usage-tier spend cap as a read-only spend limit. Documentation updates clarify that certain models require a beta header to utilize the 'speed' feature, alongside details for headers on Managed Agents and telemetry endpoints. Other chores include test coverage for OpenTelemetry options, default timeouts, and CI improvements.

## Recommended actions
- Upgrade anthropic Python SDK to v1.15.0 if utilizing new speed parameters or thinking types.
- Ensure appropriate beta headers are included when configuring requests that use the speed parameter on supported models.

## Sponsors
No sponsor placement attached.

## Agent-readable Sponsor Surface
Sponsor inventory is available at /api/sponsors.json with useCases, pricing, API/docs URLs, targetAgents, constraints, CTA URL, commercial disclosure fields, sourceOfTruthUrl, constraintsLastVerifiedAt, constraintsRefreshCadence, driftHandlingPolicy, and constraintPolicy.