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1# Assistants API tools
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3> For the complete documentation index, see [llms.txt](/llms.txt). Markdown versions of documentation pages are available by appending `.md` to the page URL.
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5After achieving feature parity in the Responses API, we've deprecated the Assistants API. It will shut down on August 26, 2026. Follow the [migration guide](https://developers.openai.com/platform/assistants/migration) to update your integration. [Learn more](https://platform.openai.com/docs/guides/migrate-to-responses).
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7## Overview
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9Assistants created using the Assistants API can be equipped with tools that allow them to perform more complex tasks or interact with your application.
10We provide built-in tools for assistants, but you can also define your own tools to extend their capabilities using Function Calling.
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12The Assistants API currently supports the following tools:
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16File Search
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20 Built-in RAG tool to process and search through files
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25Code Interpreter
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29 Write and run python code, process files and diverse data
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34Function Calling
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38 Use your own custom functions to interact with your application
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42## Next steps
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44- See the API reference to [submit tool outputs](https://developers.openai.com/api/reference/resources/beta/subresources/threads/subresources/runs/methods/submit_tool_outputs)
45- Build a tool-using assistant with our [Quickstart app](https://github.com/openai/openai-assistants-quickstart)