Key takeaways
- You negotiate by chat against a language model briefed with its own objectives and hidden limits
- The transcript is scored from 0 to 100 on six weighted dimensions, plus an objective achievement percentage
- A clean walk-away above your limit can outscore a deal signed at any price
- It gives repetitions real life cannot, but it does not replace a specific person or the tone of a call
- On Negosim one session costs one credit, and a free account includes ten
In this guide
Short answer: an AI negotiation simulator is a web application where you negotiate by chat with a counterpart played by a language model that has been given a role, objectives and limits it defends, and where the transcript is then scored against those objectives and yours. On Negosim the score runs from 0 to 100 and comes with a written analysis of what you did.
The idea is old: flight simulators, moot courts and sales role-plays all train a skill by repeating it in a setting where mistakes are free. What language models changed is the counterpart. It no longer needs a colleague with an hour to spare; it is available at any hour, stays difficult for as long as the briefing says, and can play a recruiter, a landlord or an investor.
How a session works
- A briefing. You read who you are, what you want and what you know about the other side: for example a senior developer with an offer at 95,000 and a target of 120,000
- A hidden counter-briefing. The AI counterpart gets its own role and constraints (a budget ceiling, a deadline, alternatives) that you do not see. It is instructed to stay in character and to defend them
- The exchange. You write, it answers within seconds, in the language you chose (English, French, Spanish, German or Polish). A session runs up to 30 exchanges or 30 minutes, and you can end it earlier
- The analysis. The full transcript is reviewed against both briefings. You get a score from 0 to 100 and a written report
The hidden counter-briefing is what makes the exercise worth doing. Like a real counterpart, it has a reservation price and an alternative you can only guess, so the questions you ask matter as much as the numbers you name.
What the score measures
The analysis reads the complete transcript against your briefing (the counterpart is never rated) and produces two numbers plus a report:
- Objective achievement, 0 to 100 percent. How close the outcome came to the goal in your briefing: the target salary, the terms, the conditions you were asked to obtain
- Overall score, 0 to 100. A weighted average of six dimensions, each rated 0 to 10
| Dimension | Weight | What the analysis looks at |
|---|---|---|
| Strategy and planning | 20 % | Whether you had a clear strategy, and whether you adapted it |
| Communication | 20 % | Clarity, persuasiveness, active listening |
| Value creation | 20 % | Finding solutions that work for both sides, expanding what is on the table |
| Emotional intelligence | 15 % | Reading the counterpart, managing tension |
| Closing ability | 15 % | Moving toward agreement, handling the final objections |
| Assertiveness | 10 % | Standing firm on key points without being aggressive |
The written report then walks through the key moments of the transcript, names your critical mistake (typically an early concession or an anchor abandoned without a counterpart), gives coaching on the weakest dimension and proposes a replay strategy for the next attempt. Reaching a deal at any price does not score well: a player who holds a reservation price and walks away with a clear explanation can outscore one who signs a bad agreement, because assertiveness, strategy and value creation weigh more than the closing itself.
How to read your analysis
Start with the critical mistake, then look for the moment it happened in the transcript. It is almost always in the first five exchanges: a concession made before the other side argued, a number given without a reason, a question never asked. That single moment is what you change in the replay.
Then compare two sessions on the same scenario. If your strategy and value creation scores go up while the objective achievement stays the same, you are negotiating better against a counterpart that is still defending its limit, which is the progress you want. Our guide on practising negotiation alone shows how to plan those replays over a few weeks.
What makes a good scenario
The quality of a session depends on the scenario more than on the model. A good scenario has four things:
- A real stake on both sides. You want something specific (a salary, a price, a term) and so does the counterpart, with a limit it will not cross
- Information you do not have. The counterpart's budget, deadline or alternative is hidden, so asking the right question pays off
- More than one issue. Price plus timing, scope, payment terms or exclusivity. Single-issue scenarios only train haggling; several issues let you practise trading
- A clear objective in your briefing. Without one, the analysis cannot measure how close you came
On Negosim each scenario carries a difficulty level (beginner, intermediate, advanced), a category (salary, sales, fundraising, real estate, partnerships, freelance rates) and the languages it runs in, so you can pick one that matches the conversation you are preparing for.
What it is good for
- Repetitions you cannot get in real life: three salary negotiations in an evening
- Trying a tactic (holding an anchor for three exchanges, opening a second issue) with no real money at stake
- Seeing your own patterns: most players concede in the same way every time, and only a transcript shows it
- Preparing a specific conversation: a freelance rate discussion next week, a supplier renewal, a rent increase
What it cannot do
- Replace a specific human. The counterpart is realistic but it is not your future manager; reading one person over months is a different skill
- Judge tone of voice. Everything happens in writing. Practising the words helps with the call, but it is not the call
- Guarantee an outcome. A high score means you negotiated well against this briefing, not that the real world will cooperate
How it compares with other ways to train
| Method | Repetitions | Feedback | Cost per session |
|---|---|---|---|
| Book or online course | None | None on your own moves | Low, once |
| Role-play with a colleague | A few, when schedules allow | Their impression | Their time |
| Workshop with a trainer | A few, on the day | Expert, but shared with a group | High |
| AI simulator | As many as you want | Written, on your transcript | One credit |
They combine well. A course gives the concepts, a workshop gives an expert eye once, the simulator gives the repetitions in between. Teams use it this way: sales teams to rehearse discount requests, procurement to rehearse supplier renewals.
How Negosim does it
On Negosim each scenario is written with two briefings, the counterpart is a language model kept in character by explicit instructions, and the analysis is generated from the complete transcript against a fixed set of criteria, so two players on the same scenario are judged the same way. Sessions are public by default and appear on a leaderboard with their scenario, so scores can be compared; paid plans can keep sessions private. A free account includes ten sessions: pick one of the scenarios and read your first analysis within half an hour.
