Starling‑LM‑7B‑Alpha

RLAIF-Tuned Chat Excellence at 7B

What is Starling‑LM‑7B‑Alpha?

Starling‑LM‑7B‑Alpha, also called Starling‑7B, is a 7‑billion‑parameter open-source chat model developed by researchers at UC Berkeley. It is fine‑tuned from OpenChat-3.5 using Reinforcement Learning from AI Feedback (RLAIF) and a high-quality GPT‑4–labeled ranking dataset called Nectar. This gives it exceptional dialogue alignment and helpfulness, scoring 8.09 on MT‑Bench, surpassing nearly all open models except GPT‑4 and GPT‑4 Turbo (starling.cs.berkeley.edu).

Key Features of Starling‑LM‑7B‑Alpha

7B Parameter, Mistral‑based Transformer

Built on OpenChat‑3.5 (from Mistral‑7B), optimized via AI feedback tuning for chatbot tasks (Replicate).

RLAIF via GPT‑4 Ranked Data

Fine-tuned using Nectar, a GPT‑4 ranked dataset of 183K chat prompts, and Advantage‑induced Policy Alignment (APA), a novel policy training technique (starling.cs.berkeley.edu).

Top-Tier Benchmark Results

With an MT‑Bench score of 8.09 (judged by GPT‑4) and an AlpacaEval score of ~91.99, this model ranks among the top-performing public models, outperformed only by GPT‑4 and GPT‑4 Turbo, according to Replicate. It stands out as a leading open alternative in terms of capability and alignment.

Open Weights (Non‑Commercial Use)

Released under a research-preview, non-commercial license consistent with LLaMA restrictions and the OpenAI content terms (Hugging Face).

Quantized Deployment Formats

Available in GGUF / GPTQ into 2‑6 bit quantizations, enabling inference with minimal memory via llama.cpp, AutoGPTQ, or text-generation-webui (Reddit).

Use Cases of Starling‑LM‑7B‑Alpha

Perfect for assistant tools demanding natural, helpful, and aligned multi-turn dialogue.

Well-suited for summarization, task guidance, explanation, and question-answer workflows.

Delivers improved response clarity and factuality compared to other 7B models, even in programming contexts.

Quantized versions allow local inference on modest hardware, no need for cloud APIs or large GPU RAM.

Great for labs or developers exploring RLAIF, alignment methods, or human-in-the-loop training strategies.

Starling‑LM‑7B‑Alpha Other 7B Models

Feature	Starling-LM-7B-Alpha	OpenChat-3.5-0106	Tulu-2-DPO-13B
Base Model	OpenChat-3.5 (Mistral-7B)	Same	LLaMA-2 13B
Tuning Method	RLAIF (GPT-4 Ranked Nectar)	SFT + C-RLHF	SFT + DPO Preference
MT-Bench Score	8.09	~7.81	~7.00
AlpacaEval Score	~91.99%	~88.5%	~89.5%
License	Open Non-Commercial	Open Non-Commercial	AI2 ImpACT Low-Risk
Quant Options	Highly Quantized GGUF/GPTQ	Quant options	GGUF/GPTQ Similar