Sebastianpro88/Chichu-2.5-Reasoning

TEXT GENERATIONPricing:Input $0.04 / Cached $0.008 / Output $0.08Concurrent Unit Cost:1Model Size:0.5BQuant:BF16Context Size:32kTool Calling:SupportedPublished:Aug 12, 2026License:otherArchitecture:Transformer Featherless Exclusive Cold

Sebastianpro88/Chichu-2.5-Reasoning is a 500 million parameter language model fine-tuned from Chichu 2.0. This model is specifically designed for chain-of-thought reasoning, utilizing blocks to process problems step-by-step before generating an answer. It excels in tasks requiring mathematical, logical, and general reasoning, as well as code-related questions. With a context length of 32768 tokens, it provides enhanced capability for complex problem-solving.

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Chichu 2.5 Reasoning Overview

Sebastianpro88/Chichu-2.5-Reasoning is a compact yet powerful 500 million parameter language model, building upon its predecessor, Chichu 2.0. Its core innovation lies in its chain-of-thought reasoning capability, implemented through special <think>...</think> blocks. This mechanism allows the model to internally deliberate and structure its thought process before formulating a final response, similar to advanced models like DeepSeek-R1 and Kimi-K3.

Key Capabilities

  • Step-by-step Reasoning: Employs <think> blocks for explicit, structured reasoning.
  • Enhanced Problem Solving: Fine-tuned on diverse reasoning data, including mathematics, logic, and code.
  • General Question Answering: Capable of applying its reasoning skills to a wide array of general inquiries.
  • Context Length: Supports a substantial context window of 32768 tokens, beneficial for complex problems.

Ideal Use Cases

This model is particularly well-suited for applications requiring:

  • Mathematical Computations: Solving arithmetic and algebraic problems with detailed reasoning.
  • Logical Puzzles: Tackling challenges that demand sequential logical deduction.
  • Code Analysis & Generation: Understanding and generating code snippets by reasoning through programming logic.
  • Complex Question Answering: Providing reasoned answers to intricate questions where intermediate steps are crucial.