> ## Documentation Index
> Fetch the complete documentation index at: https://langchain-5e9cc07a-preview-apirat-1764626578-896151a.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Changelog

> Log of updates and improvements to LangChain Python

<Update label="Nov 25, 2025">
  ## v1.1.0

  * [Model profiles](/oss/python/langchain/models#model-profiles): Chat models now expose supported features and capabilities through a `.profile` attribute. These data are derived from [models.dev](https://models.dev), an open source project providing model capability data.
  * [Summarization middleware](/oss/python/langchain/middleware/built-in#summarization): Updated to support flexible trigger points using model profiles for context-aware summarization.
  * [Structured output](/oss/python/langchain/structured-output): `ProviderStrategy` support (native structured output) can now be inferred from model profiles.
  * [`SystemMessage` for `create_agent`](/oss/python/langchain/middleware/custom#working-with-system-messages): Support for passing `SystemMessage` instances directly to `create_agent`'s `system_prompt` parameter, enabling advanced features like cache control and structured content blocks.
  * [Model retry middleware](/oss/python/langchain/middleware/built-in#model-retry): New middleware for automatically retrying failed model calls with configurable exponential backoff.
  * [Content moderation middleware](/oss/python/langchain/middleware/built-in#content-moderation): OpenAI content moderation middleware for detecting and handling unsafe content in agent interactions. Supports checking user input, model output, and tool results.
</Update>

<Update label="Oct 20, 2025">
  ## v1.0.0

  * [Release notes](/oss/python/releases/langchain-v1)
  * [Migration guide](/oss/python/migrate/langchain-v1)
</Update>

***

## Resources

* [Release policy](/oss/python/release-policy) – Detailed release policies
* [Versioning](/oss/python/versioning) – Understanding version numbers
* [Report issues on GitHub](https://github.com/langchain-ai/langchain/issues)

***

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