# Reasoning Architecture: \<think\> Token + Segregated vs Interleaved CoT Karar Matrisi

> Source: https://sukruyusufkaya.com/learn/fine-tuning-cookbook/ftc-reasoning-architecture-think-token
> Updated: 2026-08-11T16:39:52.442Z
> Category: Fine-Tuning Cookbook (Model-by-Model)
> Module: Part XII — Reasoning Model FT (R1-style)
**TLDR:** Reasoning model'leri ikiye ayrılır: (1) **Segregated** — \<think\>...\</think\> bloğu (DeepSeek-R1, o-series) içinde reasoning, sonra final answer; (2) **Interleaved** — reasoning + answer karışık (klasik CoT, GPT-4-1106). Her birinin avantajları, FT zorlukları, kullanıcı UX'i. Token bütçesi yönetimi.