Decision Rehearsal · Enterprise Negotiation

Practice against
the person,not the scenario.

ArenaSynth builds synthetic decision-makers with a stable psychological identity. They hold positions, push back, and stay the same person across every session you run.

Enter the arena →See the difference

// Most AI tools simulate the conversation. We model the human on the other side of the table.

MC
Marcus Chen
VP PROCUREMENT · ENTERPRISE SAAS
SESSION
MarcusYour pricing is 40% over our current vendor. Give me one reason I put this in front of the committee.
YouWhat's a quarter of manual reconciliation costing your team right now?
MarcusI've heard that pitch before. Show me a concrete ROI model, not a hypothetical — or we're done here.

Pressure, fatigue and held-position run as internal signals — surfaced in the post-session analysis, in language. No live gauges, no scores.

The difference

Every other tool forgets who it is.

Open a roleplay bot tomorrow and you're talking to a different person — new temperament, new positions, no memory of yesterday. That breaks any serious rehearsal. The counterpart has to be the same human, not a fresh draw from the prompt each time.

Prompt-driven roleplay

A new person every session.

Identity is improvised from the prompt at runtime. Same prompt, different behavior. Nothing persists. You're rehearsing against noise.

Session 1→Session 8→Session 20
3 different counterparts

ArenaSynth

The same person, every time.

Identity is fixed before the conversation begins and inspected, not improvised. Situations change; the values, biases and tendencies don't.

Same identity→new situation→coherent behavior
one counterpart, across all sessions
Why it isn't a GPT wrapper

Same knowledge. Three people. Three behaviors.

Give three counterparts the exact same fact. Their psychology — not the prompt you wrote — decides how each one reacts.

Identical input →“The CFO is pushing for a cost cut.”
MethodicalRisk-averseGuarded
“I'd need two years of P&L before any commitment. What's your pricing comparable for similar verticals?”
Reads as: methodical, asks for data, won't commit without evidence.
AssertiveStatus-drivenComposed
“We could move on this tomorrow. What's your discount if I commit to five years? My board wants a partner I can champion.”
Reads as: assertive, pushes for commitment, leverages authority.
Risk-anxiousReassurance-seekingAccommodating
“I'm worried about implementation risk. We tried this with another vendor and it got messy. Can you walk me through a case like ours?”
Reads as: anxious, seeks reassurance through concrete cases.

One fact. Three psychologies. Out of reach for a prompt-and-pray chatbot.

Identity before the conversation

The person exists before you say a word.

The counterpart isn't generated by your message. A psychological architecture is built first — temperament, values, attachment style — and the conversation runs on top of it.

Change the situation and the behavior shifts. The person underneath stays exactly who they are.

Try switching the situation →

Elena Vargas
FOUNDER · SERIES B · EU TECH
Persistent
Protects team autonomy over deal speed
Distrusts aggressive acquisition framing
Emotionally controlled under pressure
◈Situation · Budget freeze
“I won't sign anything this quarter that touches headcount. Bring me something that doesn't, and we can talk.”
// Same values, higher price sensitivity. The situation sharpens the behavior — it doesn't replace the person.
The certainty layer

Practice against what you think you know.

Everything the counterpart knows carries a level of certainty. They defend verified facts firmly, treat estimates as their working reality — and correct you when you act on an assumption that's wrong.

Public

Verified fact

Their funding, public stance, reported numbers. The counterpart holds the line hard — you won't talk them out of it.

Estimated

Their working reality

Likely budget, internal pressure, their boss's expectations. Treated as true-for-them, the way a real person operates on incomplete information.

Assumption

What you suppose

The things you walked in believing. If you're wrong, the counterpart pushes back mid-conversation — exactly where real deals collapse.

You open with: “I know your contract with your current vendor is up in March…”
Counterpart: “It's not — we renewed in January.” You just learned your prep was wrong, before it cost you the room.
From setup to live session

Built in minutes. Persistent for good.

01

Build the counterpart

From an archetype, a pasted CV/LinkedIn, or a multi-source dossier of a real public figure (beta). The psychological identity is derived — and yours to inspect.

02

Set the situation

Pick the scenario and an optional snapshot — budget freeze, board pressure, mid-cycle review. The situation reshapes behavior without touching identity.

03

Run the session

Have the conversation. The counterpart answers from who they are, defends what's public, and corrects your false assumptions — in character.

04

Read the analysis

Afterwards: outcome, relational trend, key moments and what drove them — in language, not a score. Re-run and compare attempts.

One engine, many arenas

The hard part is the engine. Arenas are the packaging.

StrataSynth composes the synthetic human and runs the behavioral engine underneath. PsycheGraph is the identity it produces. Each arena wraps that engine in the context of one kind of high-stakes conversation. One is live today; the rest are scoped.

Enterprise NegotiationLive
Executive AlignmentSoon
Board PresentationSoon
M&A Due DiligenceSoon
Crisis CommunicationSoon
Investor RelationsSoon
Regulatory NegotiationSoon
Hiring & RetentionSoon
PsycheGraph

The behavior isn't the model's.

Identity is decided first

Who the counterpart is — temperament, values, how they hold a position — is fixed before a single word is exchanged. The conversation runs on top of a person, not the other way around.

The model only speaks

PsycheGraph decides what the counterpart does. The language model just puts it into words — and it's interchangeable. Swap it out and the behavior holds. That's why this isn't a prompt in a trench coat.

Signals stay internal

The counterpart feels pressure, fatigue and risk — but you read them the way you would in a real room: in how they respond. Surfaced afterwards in language, never as a live score to game.

// You don't get a chatbot with a personality prompt. You get a person the model is renting a voice to.

What's actually real

Claims we can show our work for.

No invented consistency score, no hand-wavy “AI magic.” What stands behind a counterpart is decades of established personality science and a profile you can open and check yourself.

Grounded
Counterparts are built on established, peer-reviewed personality and values science — not a vibe a prompt improvised on the spot.
decades of psychometric research
Inspectable
The psychological profile isn't a black box you have to trust. You can open it, see who you're up against, and delete it whenever you want.
open the profile · delete on demand
EU first
Built and hosted in the EU. Source material is processed and discarded — only the derived profile stays.
EU infrastructure · source data never stored

// Our position isn't “our synthetics are right.” It's “we tell you exactly what each one demonstrates — and what it doesn't.”

Privacy by design

What you share simulates the person. Nothing more.

Never stored
The CV or notes you provide are processed in memory to derive the profile, then discarded. They never reach our database or logs.
Only the profile
What exists in the system is the derived psychometric vector — which you can inspect and delete at any time.
Yours to delete
Counterparts expire automatically, and a delete removes the profile and everything derived from your text.
EU infrastructure
Hosted in the EU. We use Google Analytics for aggregate usage to improve the product — no ad retargeting, no data brokering. Full policy →
⚠ Honest limit — Dossier (beta)
The dossier path, which simulates real public figures from multi-source evidence, currently routes some processing through models without EU residency, and the evidence engine retains raw material briefly with an aggressive TTL. It's beta, not for regulated enterprise until that gap is closed. The archetype and CV paths stay fully inside the EU guarantees above.
Where this goes

Every important conversation deserves rehearsal.

Today, the arena is enterprise negotiation. The engine doesn't care about the domain.

Negotiations today
→ every strategic human interaction tomorrow
Enter the arena →

// Create a decision-maker, set the situation, and practice until the pressure feels familiar.