🇩🇪 Rechly-DE-1.5B (Slim): 100% Local German Accounting AI for 1 GB VPS

The ultra-lightweight 1.5-Billion parameter Small Language Model (SLM) for German Invoicing, the 2025/2026 E-Rechnung Mandate (EN 16931, XRechnung 3.0, ZUGFeRD 2.3), GoBD Pre-Audit, and DATEV SKR03/04 Bookkeeping.

Runs 100% on-device inside ~1.0 GB RAM on budget 1 GB VPS micro-instances, Cloud Run, or low-cost edge containers with sub-second latency.

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🏛️ The Rechly Model Family

• ⚡ Rechly-DE-3B (Flagship) — 3B params · 1.84 GB · Desktop & Production Server
• 🪶 Rechly-DE-1.5B (Slim) — 1.5B params · 940 MB · 1 GB VPS & Cloud Run
• 🔬 Rechly-DE-0.5B (Nano) — 0.5B params · 379 MB · Raspberry Pi & 512MB RAM

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⚡ 10-Second Quickstart

1. Run with Ollama:

# Clone and build local Ollama model
huggingface-cli download jonprompter/rechly-de-1.5b rechly-de-1.5b-q4_k_m.gguf Modelfile --local-dir .
ollama create rechly-de-1.5b -f Modelfile
ollama run rechly-de-1.5b

2. Test an invoice in one line:

ollama run rechly-de-1.5b "Rechnung an Kanzlei Schmidt: 10 Std. IT-Forensik à 140€ und 1x Anfahrt Pauschal 80€, zahlbar in 14 Tagen."

3. Python 4-Liner:

import requests

resp = requests.post("http://localhost:11434/api/chat", json={
    "model": "rechly-de-1.5b",
    "messages": [{"role": "user", "content": "Kategorisiere für SKR03 und SKR04: 'Geschäftsessen im Restaurant 140€ mit Kunde'"}],
    "stream": False,
    "options": {"temperature": 0.0}
})
print(resp.json()["message"]["content"])

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⚡ Specifications

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🎯 Supported Accounting Domains

1. Text-to-Invoice (Strict JSON Extraction): Automatic detection of Kleinunternehmer (§ 19 UStG), Reverse Charge (§ 13b UStG, § 3a UStG), and Export (§ 4 Nr. 1a UStG).
2. E-Rechnung EN 16931 / XRechnung 3.0: Validated BT-10 Leitweg-ID extraction and UBL 2.1 XML serialization.
3. DATEV SKR03 / SKR04 Mapping: 30+ chart accounts with statutory 70% Bewirtung limits.
4. GoBD § 14 Abs. 4 Pre-Audit: Pre-checks incoming invoices to assist in identifying missing mandatory items.
5. Multi-Stage Mahnwesen: Dunning letters for Stufe 1, 2, and 3.
6. B2B Line Item Rewriter: Formalizes informal notes into professional position texts.

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⚖️ Legal, GDPR & Benchmark Disclaimers

1. No Tax Advice (Keine Steuerberatung)

Rechly-DE-1.5B provides automated text extraction and schema formatting based on public statutory standards. It is an open-source productivity tool and does not replace certified tax advice by an authorized Steuerberater (gem. StBerG / RDG).

2. GDPR / DSGVO Notice

*The model runs locally on-device with zero network egress, supporting Data Protection by Design & Default (Art. 25 GDPR). However, legal GDPR compliance remains the responsibility of the entity acting as the Data Controller (Art. 4(7) GDPR).*

3. Internal Synthetic Benchmark Notice

Reported benchmark figures represent internal, synthetic test suites developed within this project. They do not constitute an official government audit or certified third-party endorsement.

4. Trademarks & Third-Party Notice

DATEV® is a registered trademark of DATEV eG. ZUGFeRD is a registered specification of FeRD / AWV e.V. This project is an independent community project and is not affiliated with or endorsed by DATEV eG or FeRD.

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🔒 License & Open Source

Licensed under the Apache 2.0 License. Built by the Rechly team for privacy-first, on-premise German accounting.