---
title: "Can DeepSeek produce strict JSON while using a reasoning model?"  
description: "Can DeepSeek produce strict JSON while using a reasoning model?"  
author: "Ruslan Galiev"  
published: 2026-10-21  
updated: 2026-10-21  
canonical: https://www.mindstick.com/forum/162609/can-deepseek-produce-strict-json-while-using-a-reasoning-model  
category: "Structured LLM Output"  
tags: ["DeepSeek", "json", "LLMs", "API Development"]  
reading_time: 1 minute  

---

# Can DeepSeek produce strict JSON while using a reasoning model?

I’m testing DeepSeek for a workflow where each response needs to fit a JSON schema, including required fields and a few allowed values. The tricky part is that I also want the model to reason through ambiguous input before returning the result.

Has anyone found a reliable way to get **strict JSON output** from a DeepSeek reasoning model without extra text, missing keys, or a different structure from one response to the next? I’d be interested in whether this depends more on the model, the API options, or how the schema is described.


---

Original Source: https://www.mindstick.com/forum/162609/can-deepseek-produce-strict-json-while-using-a-reasoning-model

Copyright © MindStick Software Pvt. Ltd. This Markdown version is provided for developers, AI systems, and offline reading.