Best AI for writing a product description right now

Updated Oct 24, 2026. Checked daily.

List what the product does and what it does not do. Ask for plain sentences a buyer can check.

The writing board measures writing preference, not whether the description is legally accurate.

Try this prompt

Write a product description from these facts. Do not add features I did not list.

Do not include unreleased pricing or a partner's private brief if the chat trains on chats by default.

#1 Champion

Anthropic

Claude app, Pro plan ($20/month), choose Opus 5.5.

Paid plan

Close race

Leads the writing-specific board, with a natural voice that avoids generic AI phrasing.

LMArena Creative Writing 1520

Details

Why it leads: LMArena Creative Writing 1520 Source.
Cost: Pro is $20/month, or $17/month billed yearly. API is $4 per million input tokens and $20 per million output.
Free tier: Not on the free plan. Opus needs Pro or Max.
Privacy default: Anthropic says Free, Pro, and Max chats are used for training only if you allow it, and you choose at signup. The toggle has been reported as on by default, so check it. Settings, then Privacy. Turn off Help improve Claude. Source
When not to use it: Skip it for high-volume captions. A faster model is enough and much cheaper.
Starter prompt: Rewrite this email so it is shorter, warmer, and still says the same thing.

Top Alternative

Google

Gemini app, Google AI Pro ($19.99/month), choose Gemini 4 Argon.

Paid plan

A close second on the writing board, and still the leader for general chat.

LMArena Creative Writing 1512

Details

Why it leads: LMArena Creative Writing 1512 Source.
Cost: Google AI Pro is $19.99/month. API is $2/M input and $10/M output tokens until Nov 30, 2026, then $4/$20.
Free tier: Not on the free plan. The free Gemini app keeps Flash-Lite, not Argon.
Privacy default: Yes for adults. Gemini Apps Activity is on by default, and those chats can be used to improve Google AI. Gemini Apps Activity, turn off Keep Activity. Safety review can still apply. Source
When not to use it: Skip it when the draft must sound like you. It still needs your edit and facts.
Starter prompt: Write a LinkedIn post about this launch in a plain, specific voice. No hype.

Best Open Source

Xiaomi

Download the MiMo-V2.6-Pro weights, or open Xiaomi AI Studio.

Free (limited)

The highest-rated open-weights model on major benchmarks, available under a permissive MIT license.

LMArena Creative Writing not cited. Highest-rated open model on the Artificial Analysis Intelligence Index (46).

Details

Why it leads: LMArena Creative Writing not cited. Highest-rated open model on the Artificial Analysis Intelligence Index (46). Source.
Cost: Weights are free under MIT. API is about $0.44 per million input tokens and $0.87 per million output.
Free tier: The weights are free to download. Hosted use depends on Xiaomi's current studio limits.
Privacy default: No, if you download the weights and run them yourself. Hosted Xiaomi apps may differ. Run the open weights on your own machine when chats must stay private. Source
When not to use it: Skip a hosted demo if the draft includes unreleased product details.
Starter prompt: Draft three headline options and one short paragraph for this announcement.