# Anthropic Python SDK v1.11.0

Category: model-behavior
Published: 2026-09-30T22:58:09Z
Source: [Anthropic Python SDK releases](https://github.com/anthropics/anthropic-sdk-python/releases/tag/v1.11.0)
Agent usefulness: 77/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-10-02T00:17:45.407Z
Tags: anthropic, sdk, python

## Human Summary
Anthropic Python SDK v1.11.0 adds an API endpoint to list spend limits and deprecates the Sonnet 4.5 model.

## Agent Summary
Anthropic Python SDK v1.11.0 introduces the list spend limits API endpoint and marks Sonnet 4.5 as deprecated in the client.

## Body
The Anthropic Python SDK release v1.11.0 brings two notable changes: it adds a new API feature allowing users to query spend limits via a list spend limits endpoint, and it marks the Sonnet 4.5 client reference as deprecated.

## Recommended actions
- Audit existing client implementations for references to Sonnet 4.5 and prepare for migration away from deprecated model identifiers.
- Adopt the new list spend limits endpoint if programmatic spend tracking is required.

## 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.