LFM2.5-1.2B-Thinking

Reasoning-focused 1.2B parameter model with enhanced math and logical problem-solving

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LFM2.5-1.2B-Thinking is optimized for reasoning tasks, delivering strong performance on math, logic, and multi-step problem-solving. Built on the LFM2.5 architecture with specialized training for chain-of-thought reasoning.

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Specifications

Property	Value
Parameters	1.2B
Context Length	32K tokens
Architecture	LFM2.5 (Dense)

Math & Logic

Strong arithmetic and logical reasoning

Chain-of-Thought

Step-by-step problem decomposition

Fine-tunable

TRL compatible (SFT, DPO, GRPO)

Quick Start

Transformers

llama.cpp

vLLM

SGLang