Anthropic Python SDK v0.114.0 Adds Support for Claude Sonnet 5
Anthropic has released version 0.114.0 of its Python SDK, adding support for the claude-sonnet-5 model. The update also includes a bug fix for the agent toolset that allows absolute paths resolving inside the working directory.
Anthropic Python SDK v0.114.0 Adds Support for Claude Sonnet 5
Anthropic released version 0.114.0 of its Python SDK on June 30, 2026, adding support for a new model identifier: claude-sonnet-5.
New Model Support
The primary feature in this release is API support for claude-sonnet-5. The SDK commit (b893033) indicates this is a new model identifier being added to the Python client library, though Anthropic has not yet disclosed full specifications, pricing, or capabilities for this model.
The naming convention suggests this could be either a new version in the Claude 3.5 Sonnet family or potentially a next-generation Claude 4 Sonnet model. No context window size, benchmark scores, or pricing details have been published alongside this SDK update.
Bug Fix
The release includes one bug fix for the agent toolset functionality. Previously, the SDK's agent toolset had issues with absolute paths. The fix (PR #121, commit 0105529) now allows absolute paths that resolve inside the working directory, improving path handling for agent-based applications.
What This Means
This SDK update indicates Anthropic is preparing to launch or has quietly launched a model called claude-sonnet-5. However, developers should note that SDK support alone doesn't confirm the model is publicly available—it may be in limited testing or available only to specific customers. The agent toolset fix suggests Anthropic continues developing agent-based capabilities for its models, addressing practical implementation issues developers encounter when building agentic systems. Developers using the Anthropic Python SDK should check the official API documentation for model availability and specifications before integrating claude-sonnet-5 into production systems.
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