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Elon Musk’s Grok AI Model Now Supports Files in API

Elon Musk’s Grok AI Model Now Supports Files in API

The xAI API, powered by Grok AI models, now supports various file formats, including text, PDF, CSV, JSON, and more.

Written by Akash Dutta, Edited by Ketan Pratap | Updated: 11 November 2025 18:10 IST

Photo Credit: xAI

The xAI API also supports multi-turn conversations with files

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Highlights

The maximum file size supported by the xAI API is 48MB
Only Grok 4 and Grok 4 Fast support file processing
Users can attach multiple files and chat about them

Elon Musk's xAI has now added file support in its Grok-powered application programming interface (API). With this, developers can now offer this capability in the artificial intelligence (AI) apps and tools they develop and release. While most major AI companies already offer this feature, xAI has now joined the ranks as well. The company says that the API will now support a wide range of file formats, and it will also allow users to attach multiple files and have conversations about them.

File Support Comes to xAI API

xAI has been rapidly expanding its features. Recently, the company upgraded the Grok Imagine feature to allow users to type detailed prompts and generate videos based on them. Both instruction following, complex prompt understanding, and the output fidelity has been improved. Now, the Musk-led company is offering file support to developers via its Files API.

On Tuesday, Musk reshared a post on X (formerly known as Twitter) highlighting that the new Files API will allow developers to offer the ability to upload and attach a document and answer queries based on it. To analyse files, the API uses an agentic tool calling function. This is why the feature is only available with Grok 4 and Grok 4 Fast AI models.

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At present, the API supports a large number of file formats, including plain text, markdown, Python, JavaScript, CSV, JSON, PDF, and more. However, the maximum file size it accepts has been limited to 48MB. Also, batch requests are not possible while pulling a request from files.

Coming to the features, it supports multi-file support and multi-turn conversations. Additionally, the code execution tool has been integrated to enable the underlying AI model to perform advanced data analysis, statistical computations, and more. The model can also write and execute Python code that processes your files directly.

Notably, the Files API charges $10 (roughly Rs. 885) per 1,000 tool invocations. Each time the model searches the documents, it counts as one tool invocation. These charges are applied in addition to standard token costs. File-based chats use prompt tokens, reasoning tokens, completion tokens, and cache tokens (for repeated document content).

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Further reading: Elon Musk, xAI, Grok, API, AI, Artificial Intelligence

Akash Dutta Email Akash Dutta

Akash Dutta is a Chief Sub Editor at Gadgets 360. He is particularly interested in the social impact of technological developments and loves reading about emerging fields such as AI, metaverse, and fediverse. In his free time, he can be seen supporting his favourite football club - Chelsea, watching movies and anime, and sharing passionate opinions on food. More

Elon Musk’s Grok AI Model Now Supports Files in API

File Support Comes to xAI API

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