Everyone and their mom is talking about Jev. Jev this, Jev that. Everyone on Twitter is all over Jev, how it's the next frontier of large language models and the AI paradigm. We don’t really think so. So here's Jev in 25 lines of Python.

/// script

requires-python = ">=3.12"

dependencies = ["huggingface-hub", "llama-cpp-python", "numpy"]

///

import numpy from llama_cpp import Llama

Really, you can use any GGUF model from https://huggingface.co/models?library=gguf

model = Llama.from_pretrained( repo_id="Qwen/Qwen3-0.6B-GGUF", filename="Qwen3-0.6B-Q8_0.gguf", n_ctx=512, logits_all=True, verbose=False, )

Load the prompt and define your choices.

labels = ["A", "B", "C"] choices = ["Legitimate", "Spam", "Phishing"] email = "Payroll asks for your password on a non-company sign-in page." options = "\n".join( f"{label}. {choice}" for label, choice in zip(labels, choices, strict=True) ) prompt = f"""<|im_start|>system Choose one option.<|im_end|> <|im_start|>user Email: {email}\n\n{options}<|im_end|> <|im_start|>assistant <think>\n\n</think>\n\n""" model.eval(tokens=model.tokenize(text=prompt.encode(), add_bos=False, special=True))

Massage the logits into probabilities.

logits = model.scores[model.n_tokens - 1] token_ids = [model.tokenize(text=label.encode(), add_bos=False)[0] for label in labels] choice_logits = numpy.asarray([logits[token_id] for token_id in token_ids]) logprobs = choice_logits - numpy.logaddexp.reduce(choice_logits) probabilities = numpy.exp(logprobs)

for name, scores in ( ("Logits", choice_logits), ("Log probabilities", logprobs), ("Probabilities", probabilities), ): values = numpy.round(scores.astype(float), 3).tolist() print(f"{name}:", dict(zip(choices, values, strict=True)))

Logits: {'Legitimate': 26.254, 'Spam': 27.262, 'Phishing': 29.614}

Log probabilities: {'Legitimate': -3.482, 'Spam': -2.474, 'Phishing': -0.122}

Probabilities: {'Legitimate': 0.031, 'Spam': 0.084, 'Phishing': 0.885}

There. That’s Jev.

And we like not sending your data anywhere else. Check out NobodyWho.

(note: this is a parody blog post, see these links for better/more complete open implementations of Jev: OpenJev, openjev-sglang, and OpenJev on DiffusionGemma.)

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