What's Changed

• OpenAI responses API improvements by @arjan in https://github.com/brainlid/langchain/pull/391
• Support Anthropic disable_parallel_tool_use tool_choice setting by @vlymar in https://github.com/brainlid/langchain/pull/390
• Update gettext dependency version to 1.0 by @bijanbwb in https://github.com/brainlid/langchain/pull/393
• Add DeepSeek chat model integration by @gilbertwong96 in https://github.com/brainlid/langchain/pull/394
• Loosen the gettext dependency by @montebrown in https://github.com/brainlid/langchain/pull/399
• add MessageDelta.merge_deltas/2 by @brainlid in https://github.com/brainlid/langchain/pull/401
• formatting update by @brainlid in https://github.com/brainlid/langchain/pull/402
• Added an :cache_messages option for ChatAnthropic, can improve cache utilization. by @montebrown in https://github.com/brainlid/langchain/pull/398
• Add support for Anthropic API PDF reading to the ChatAnthropic model. by @jadengis in https://github.com/brainlid/langchain/pull/403
• feat: Add support for :file_url to ChatAnthropic too by @jadengis in https://github.com/brainlid/langchain/pull/404
• Support reasoning_content of deepseek model by @gilbertwong96 in https://github.com/brainlid/langchain/pull/407
• Add req_opts to ChatAnthropic by @stevehodgkiss in https://github.com/brainlid/langchain/pull/408
• Open AI Responses API: Add support for file_url with link to file by @reetou in https://github.com/brainlid/langchain/pull/395
• Add strict tool use support to ChatAnthropic by @stevehodgkiss in https://github.com/brainlid/langchain/pull/409
• Add strict to function of ChatModels.ChatOpenAI by @nallwhy in https://github.com/brainlid/langchain/pull/301
• Allow multi-part tool responses. by @montebrown in https://github.com/brainlid/langchain/pull/410
• prep for v0.4.1 release by @brainlid in https://github.com/brainlid/langchain/pull/411

New Contributors

• @vlymar made their first contribution in https://github.com/brainlid/langchain/pull/390
• @bijanbwb made their first contribution in https://github.com/brainlid/langchain/pull/393
• @gilbertwong96 made their first contribution in https://github.com/brainlid/langchain/pull/394
• @reetou made their first contribution in https://github.com/brainlid/langchain/pull/395

Full Changelog: https://github.com/brainlid/langchain/compare/v0.4.0...v0.4.1