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Reasoning Architecture: <think> Token + Segregated vs Interleaved CoT Decision Matrix

Reasoning models split: (1) **Segregated** — reasoning in <think>...</think> block (DeepSeek-R1, o-series), then final answer; (2) **Interleaved** — reasoning + answer mixed (classic CoT, GPT-4-1106). Each's advantages, FT challenges, user UX. Token budget management.

Şükrü Yusuf KAYA
28 min read
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Reasoning Architecture: \<think\> Token + Segregated vs Interleaved CoT Karar Matrisi

1. İki Reasoning Paradigması#

Segregated (DeepSeek-R1, OpenAI o-series, Gemini-thinking)#

User: 5 elma + 3 portakal = ?
Assistant:
<think>
Soru basit toplama. Elma ve portakal birim olarak meyve sayısı.
5 + 3 = 8 toplam meyve.
</think>
Toplam 8 meyve.

Interleaved (Klasik CoT, GPT-4-1106)#

User: 5 elma + 3 portakal = ?
Assistant:
Önce elmaları sayalım: 5.
Sonra portakalları: 3.
Toplam: 5 + 3 = 8 meyve.
AspectSegregatedInterleaved
Final answer hızıyavaş (think bloğu önce)erken (akış halinde)
UX"thinking..." göstergesi rahatstreaming chat
Token bütçesicontrollable (max_think_tokens)unbounded
Eval kolaylığıregex `` parsetext scan
User readingrahat (think hidden)reasoning de görünür
Cookbook tavsiyesi (2026):
  • Math/code domain → Segregated (R1-style, daha kontrol)
  • Chat/general → Interleaved (klasik CoT)
✅ Teslim
  1. R1-Distill model'in output formatını incele. 2) Kendi use-case için segregated mı interleaved mı karar ver. 3) Sonraki ders: 12.2 — Reasoning Trace Dataset Üretimi.

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