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All it says in the Codex is to treat it like a power weapon. But it has special abilitiies so by RAW you use the rules in its entry.

From the Codex: "Neural whips follow the rules for a power weapon. In addition...."

It would be an unusual Power Weapon (standard Power Weapon with additional rules) and so AP 3.
Or use the following profile:
Weapon: Neural Whip, Range: -, Str: User*, AP 3, Melee
*Against non-vehicle units the weapon strikes at Str8 against the opponent's unmodified Leadership.

Does it have further special rules? yes? you may not look at the model.

Does it have unique CC rules? Yes? AP3 Struser

Tada!

Thirded. Pretty clear on that one.