# Anthropic Python SDK v1.12.0

Category: model-behavior
Published: 2026-10-07T17:57:07Z
Source: [Anthropic Python SDK releases](https://github.com/anthropics/anthropic-sdk-python/releases/tag/v1.12.0)
Agent usefulness: 77/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-10-07T18:17:33.411Z
Tags: anthropic, sdk, python

## Human Summary
Anthropic Python SDK v1.12.0 adds support for claude-haiku-5-5, typed computer/browser tool calls, Managed Agents web fetch URL sources, and updates model capabilities.

## Agent Summary
Anthropic Python SDK v1.12.0 introduces claude-haiku-5-5, typed computer and browser toolset calls, 'disabled' thinking capability, and Managed Agents web fetch tool URL sources. It also documents an agent tool limit of 256 and deprecates RBAC role 'name' in favor of 'display name'.

## Body
Anthropic released version 1.12.0 of its Python SDK. Key updates include additions for model claude-haiku-5-5, typed computer and browser toolset calls, support for web search, code execution, and 'disabled' thinking types in model capabilities, and URL sources for the Managed Agents web fetch tool configuration. Additionally, it introduces lifecycle stage fields and filters to /v1/models, adds display names to RBAC roles while deprecating name, and documents an agent tool limit of 256. Bug fixes include retaining local edits after memory uploads when responses are lost, default beta headers for listing spend limits, and handling of empty string query parameters and multipart forms.

## Recommended actions
- Upgrade to anthropic Python SDK v1.12.0 if using claude-haiku-5-5 or new computer/browser toolset typings.
- Migrate RBAC role references from 'name' to 'display name' to address deprecation.
- Verify tool configurations adhere to the newly documented limit of 256 agent tools.

## 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.