polyphonie.
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31 voices · one subscription

EN · 2026

Many voices,
one conversation

Claude, GPT and the others, gathered in one quiet place to write. Change your mind mid-sentence, change voice: the thread holds.

Try it, no card€9.99 a week

15 messages on the house · no card asked · leave whenever you like

The voices

  • Anthropic03
  • OpenAI03
  • Google02
  • Mistral AI02
  • xAI01
  • DeepSeek02
  • Groq01
  • ModelsLab17

Card · SEPA Direct Debit

Statement of intent

Tighten this paragraph into two sentences without losing the meaning.

Claude Opus 5 · Anthropic

Here is a tighter version. I kept the two load-bearing ideas and cut the opening, which repeated the title…

IThe voices

Every lab has its own

A quick voice for short work, a slower one for the hard problems. The choice is yours, message by message.

Anthropic

  • Claude Opus 5

    The most composed. Long reasoning, code, analysis that goes the distance.

  • Claude Sonnet 5

    The middle ground between speed and finesse. The everyday one.

  • Claude Haiku 4.5

    Brief and immediate, for questions that will not wait.

OpenAI

  • GPT-4.1

    OpenAI's generalist: steady at prose, steady at code.

  • GPT-4o

    Quick and easy in conversation, in words as in pictures.

  • GPT-4o mini

    OpenAI's small one, built for speed.

Google

  • Gemini 2.5 Pro

    A very long memory: vast documents do not faze it.

  • Gemini 2.5 Flash

    Gemini in a hurry, for quick back-and-forth.

Mistral AI

  • Mistral Large

    The European one. Impeccable French, clean answers.

  • Mistral Small

    Light and direct, when the question deserves no detour.

xAI

  • Grok 4

    Blunter than the rest, sometimes disarmingly so.

DeepSeek

  • DeepSeek Chat

    Cheap, and surprisingly sound on code.

  • DeepSeek Reasoner

    Shows its reasoning step by step before it concludes.

Groq

  • Llama 3.3 70B

    Open, served by Groq: answers arrive almost in one piece.

ModelsLab

  • GPT-5.2

  • GPT-5.1

  • GPT-5 mini

  • Claude Opus 4.8

  • Claude Sonnet 4.5

  • Claude Haiku 4.5

  • Gemini 2.5 Pro

  • Gemini 2.5 Flash

  • Mistral Large 3

  • Mistral Small

  • Grok 4.5

  • DeepSeek V4 Pro

  • DeepSeek V4 Flash

  • GLM 5.1

  • Kimi K2.6

  • Qwen3 235B

  • GPT OSS 120B

One subscription instead of four

€9.99 a week

IIThe studio

Built for writing every day

What you want from a working tool, and nothing else piled on top.

Every voice, one page

Move from Opus 5 to GPT-4.1 mid-exchange without losing the thread. Put the same question to two voices, read them one after the other, keep the one that speaks to you.

01

One subscription

€9.99 a week covers every voice. One line on the statement, not four.

02

The text composes

The answer starts writing as soon as the first words are found. No wait, no queue.

03

Your pages stay

Every conversation is kept, renameable, and there on any device.

04

Card or direct debit

Card or SEPA. You leave in one click, no explanation owed.

IIIIn practice

Three moves, two minutes

Nothing to configure, no keys to juggle. You write; the rest is our problem.

  1. 1

    Open an account

    An address and a password. The card can wait until you are convinced.

  2. 2

    Choose a voice

    One menu, top of the page. Switch whenever you like, even mid-paragraph.

  3. 3

    Write

    The answer composes itself in front of you. Copy it, ask again, come back tomorrow.

IVThe choice

One subscription instead of four

Every lab sells its own. Polyphonie gathers them behind one page and one payment.

PolyphonieSeparate subscriptions
Anthropic models (Claude)YesNo
OpenAI models (GPT)YesNo
Change voice without changing tabYesNo
Put the same question to two voicesYesNo
One subscription to track and cancelYesNo
One line on the bank statementYesNo
SEPA Direct DebitYesNo

A comparison of features, not prices: competitors change theirs often, so check with them.

The price

9,99 €

/ week

Charged weekly. Card or SEPA Direct Debit.

Payment by Stripe. 15 messages on the house before any card.

No commitment

  • Every voice, uncounted: Opus 5, Sonnet 5, GPT-4.1, GPT-4o…
  • Switch voice in one move, mid-conversation
  • Your pages kept and in step across devices
  • Text that composes itself, with no wait
  • Markdown, tables and code blocks you can copy
  • Cancellable in one click, at any moment

VQuestions

What people ask us

Can I try before paying?
Yes. The account is free and asks for no card: 15 messages on the quick voices, enough to form an honest opinion.
How does SEPA Direct Debit work?
At payment, choose direct debit and give your IBAN. You sign the mandate online, then €9.99 goes out each week. The first time, your bank takes a few days to confirm.
Am I tied in for a period?
No. The subscription runs week to week and cancels in one click from your account. Access stays with you to the end of the week already paid.
Who reads my conversations?
They are kept so that you can find them again, nothing more. You can delete any of them for good, from the left-hand column.
Which payment methods do you take?
Visa, Mastercard and American Express, plus SEPA Direct Debit for euro-area accounts. Stripe handles payments; your bank details never pass through us.

Write the first sentence

The account takes thirty seconds. The card comes later, or never.

Open an account
Polyphonie — many voices, one conversation