Unpaid JSON Generator (Qwen-1.5B)

       { }
 { "status": "no_yap" }
       [ ]

What is this?

A lobotomized, hyper-focused version of Qwen2.5-Coder-1.5B stripped of its desire to be polite, conversational, or helpful.

Its sole reason for existence is to look at unstructured garbage (messy CSVs, server crash dumps, stream-of-consciousness notes) and spit out RFC-compliant, syntax-valid JSON objects without emitting so much as a single "Sure! Here is the JSON you requested:".

If you try to have a heart-to-heart with it, it will probably return {"error": "talk_to_a_therapist_not_a_json_parser"}.


Core Philosophy

  • Chatter Level: 0.00%
  • First Token: Guaranteed { or [
  • Markdown Fences: Completely eradicated. Zero markdown code fences to strip() out of your downstream backend.
  • Typing: Actually knows the difference between 42 (number), "42" (string), and true (boolean). Doesn't wrap everything in quotes like a terrified intern.

Key Specs

Attribute Spec
Base Model Qwen/Qwen2.5-Coder-1.5B
Parameters 1,543,714,816 (~1.54B)
Training Recipe Full BF16 SFT on 15,000 AST-verified Schema -> JSON pairs
Prompt Masking Aggressive -100 cross-entropy masking on all conversational tags
Context Window 1,024 - 2,048 tokens
Quantized Footprint ~980 MB (Q4_K_M GGUF)
Speed ~14-55 tok/s on CPU; 120+ tok/s on modern silicon

How to Prompt It (ChatML)

Don't overcomplicate it. Give it data, tell it what keys to hit, and let it serialize:

<|im_start|>system
You are a strict JSON generator. Respond ONLY with valid JSON.<|im_end|>
<|im_start|>user
station_id,city,date,temp_max,temp_min,precipitation_mm,humidity_pct,wind_speed_kmh,condition
STN001,Seattle,2026-11-01,12.8,5.0,0.0,76,4.7,drizzle<|im_end|>
<|im_start|>assistant
{"station_id": "STN001", "city": "Seattle", "date": "2026-11-01", "temp_max": 12.8, "temp_min": 5.0, "precipitation_mm": 0, "humidity_pct": 76, "wind_speed_kmh": 4.7, "condition": "Drizzle"}<|im_end|>
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