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Accepting a customized model for team use

Short answer

Buy fine-tuning with an acceptance agreed before the project ends: a set of cases the model has not seen, criteria for correctness, acceptable errors and the person who takes over cases that need checking. A demo of a few correct answers does not tell you whether the version that goes into the application meets these conditions.

How we workDetails ↓

  1. 01Call30 minutes with an engineer, free
  2. 02PrototypeA working system on your process and data, free
  3. 03ImplementationTarget and fixed price in the contract; 50% at signing
  4. 04Acceptance50% once the agreed target is met
model on your server or in the cloud in the EU
quoted after the review
same work in application with EU cloud model
from €3,000
task, data and equipment analysis
€0

We belong to the OpenAI and Anthropic partner programmes and learn through their official courses. What this means ↓

Author: Syntalith · 3 min read

Example: the morning request inbox
Agent · ready

Statistics

Buying fine-tuning: statistics 2026

30 h

a month fewer corrections at 1,500 cases: a clear instruction with sources cuts errors from 20% to 10%, fine-tuning to 5%. Scenario.

Figures checked: 22 October 2026

Acceptance concerns the version that will go into the application, with the same prompt and the same input data as in daily work. The model shown in a demo may have worked with a different prompt or on chosen examples. According to the European Commission (2026), 42% of small and medium-sized companies and mid-caps in the EU already use AI, mostly in a limited and experimental way, so a measurable acceptance is also the basis for counting the return later.

Acceptance criteria for fine-tuning
  • A set of cases not used for training
  • Correctness criteria for each kind of error
  • A comparison with a simpler change on the same set
  • The acceptable error level and the cases for a person
  • An owner of corrections after acceptance

A demo may answer a different question from acceptance

Suppose a model reads product names from orders. In the demo it recognises clear messages well. In daily work, though, some descriptions do not show the product variant. The buyer has to see whether the application leaves such an entry for clarification and whether the employee can go back to the original.

Acceptance should not require guessing the missing variant. It should cover the agreed behaviour when the description is incomplete. The contractor and the client have to understand in advance when a result is a useful proposal and when it needs manual work.

Hugging Face separates material for training, tuning and the final evaluation of a model. In a purchase, this means you need cases on which the result is checked after the adaptation is finished. Correcting the model again and again against the same examples weakens the value of such an acceptance.

What to agree before the project ends

The criteria should describe the specific use and the kinds of mistakes the team can judge. When reading orders, a wrong variant and a missing proposal lead to different work. The process owner explains which errors make the result unusable and which the employee can correct easily in the view provided.

You also need to name the model and application version under assessment. If the way text is delivered or the product list changes after the trial, the earlier result may not describe the new set-up. The buyer should receive a clear record of what was checked and what the trial did not cover.

A list of known limits helps set the scope of the launch. It need not stop the whole project: some cases can stay manual. What matters is that users know about this limit and that the person responsible for acceptance accepts it knowingly.

A correction after acceptance also needs an owner

Before the work ends, agree where an employee reports a mistake and who assesses its cause. A model error, missing information in the source and a change in a company rule may need different actions. A general promise of support does not say how the team will handle the first hard case.

In a conversation with Syntalith, the client brings the task, the people who assess the results and the expected way of using them. The proposed acceptance material combines examples of answers, a description of the remaining limits and a decision on the scope of further use. Contract terms and later maintenance need a separate agreement.

Describe a situation in which an employee could not use the model's answer. That is a good start for a conversation about model acceptance. We price a private model after a free conversation about the task, the data and the hardware. An application that uses the model starts from €3,000 net (pricing).

What it costs

Scenario: 1,500 cases a month
Today: 20% errors × 1,500 × 8 min
40 h (€1,396)
After a change without training (a clear instruction with sources): 10%
20 h (€698)
After fine-tuning: 5%
10 h (€349)

Fine-tuning adds 10 h (€349) a month beyond the simpler change

The error shares and the correction time are the scenario's assumptions, which we measure on cases not used for training. €34.90 an hour is the EU average hourly labour cost for 2025 according to Eurostat.

The comparison before the decision
  • Cases for assessment kept apart from training examples
  • The same set for the current solution, the simpler change and the new model
  • Decisions by the people who correct the results today
  • Errors counted separately for each kind of mistake

Where to start

In the free review we choose one process and 20 to 100 cases the team has already handled. We compare the simpler change with an adapted model on cases the model has not seen, and within 2 working days you receive a written summary with a price. We adapt models as part of private LLMs, and build the application as part of AI apps.

Worked example · Scenario

How we count the payback: an adapted model

We run the same count for your team in the free review.

€4,188

a month for the work on 600 questions

EU cloud version payback: 0.8 mo.

Our assumptions are 12 minutes to find an answer in the documentation, and checking in 15% of the old time. €34.90 an hour is the EU average hourly labour cost for 2025 according to Eurostat, for companies with 10 or more employees. Model cost: Claude Sonnet 5.5, about 6,000 + 500 tokens per answer in the EU cloud version, at the ECB rate of 1.1205 USD per euro on 22 October 2026. We count the payback for an app with a model in the EU cloud (from €3,000 net). We price the model on your server after a call, and the cost of people's work stays the same.

See the full calculation →

This is how we implement it in companies

All case studies →

Client results.

All projects →
foap.comcustomer service

foap.com customer service: 95% of replies are sent automatically.

Users from several countries write to foap.com, in several languages. The system reads the entire conversation and the terms of that person, and then sends a response in that person's language. Questions about money and exceptions go to the team with a ready draft, so they have to check and send them.

the system sends the answers itself, without human typing
95%
time from the arrival of the e-mail to the ready response (median)
30 s
e-mails that require a response receive a ready-made draft
100%
less work for every 1000 answers (estimate)
47 h

Data from foap.com production, October 20-21, 2026. Estimate: 3 minutes for handwritten response.

How foap.com customer service works →
Sample messages. Money matters always come to the person.

Other implementations

jaktako.design

studio projektowe

−87%

Time to look for new customers, every day

4 hours → 30 min

approx. 73 hours less per month (21 days of work)

according to the studio

How the agent loop works →
Signature Estates

real estate

approx. −90%

Operator time spent browsing portals, per day

2–3 hours → 20 min

approx. 45 hours less per month (21 days of work)

respect · contact the seller 5 minutes after the announcement

How the agent finds property listings →
Kuba Koziej, CEO and co-founder of MoreGrowth and board member at Natu.Care

Kuba Koziej

CEO and co-founder, MoreGrowth

„We started with my own AI agent. During the training that followed, I learned to build new applications myself. Today I am bringing this way of working with AI into my business. Working with Syntalith gave me exactly the skills and tools I needed.”

View the original training review on LinkedIn ↗

A model on your server or in the cloud in the EU, proven on your tasks.Book a free process review (30 min) →

How we build automation and agents

From a conversation to a working system in four steps.

  1. 01 · 30 min

    Free process review

    €0

    You're talking to an engineer. You receive the written plan within 2 business days.

  2. 02 · 5 days

    Free prototype

    €0

    The system works on 20-100 cases that your team has already handled. You see every result.

  3. 03 · 2–16 weeks

    Build

    50%

    Fixed price and goal written in the contract. First installment upon signing.

  4. 04 · after reaching the goal

    Reception

    50%

    You pay the second installment when the system reaches its target on your cases.

How a free prototype is created

Mon.

We set a goal

What result do you consider good?

Tue–Wed

The system is working

It goes through your affairs, one by one.

Thu

We compare

We check every difference with the team's work.

Fri

Result and price

List of errors and fixed implementation price.

You choose the matters. We anonymize them upon request, they stay in the EU and we delete them after the test.

On the market, such a test usually costs from PLN 3,000 to PLN 8,000.

Book a free process review (30 min)

We establish a prototype during a free analysis.

Data checked on October 25, 2026.

„Is my data safe?”

Yes. You choose where they go: from your company account to the model on your server.

  1. 00Employee's private account

    Customer and company data ends up in an account that the company cannot see or control. There is no data processing agreement, so it is a violation of the GDPR. When an employee leaves, the chat history goes with them.

  2. 01ChatGPT or Claude corporate account

    The provider does not use your data to train models. A copy of the queries remains in his logs for up to 30 days.

  3. 02API with zero retention (ZDR)

    The provider processes the request and does not save anything. It requires his consent, we prepare the application together.

  4. 03Processing in the EU

    Queries are counted and stored in Europe: OpenAI in the EU region, Claude via clouds with the EU region.

  5. 04Model at your place

    The open model runs on your server or in your cloud in the EU. The data does not go outside the company.

What we do with every implementation

  • Confidentiality agreement and data processing agreement before we receive any data.
  • You choose the cases for the prototype and we anonymize them upon request.
  • The data stays in the EU and we delete it after the test.
  • Corporate accounts with an administrator on your side.

When data cannot leave the company

The open model runs on your server or in your cloud in the EU. To choose from:

White-tailed eagle
Polish model, SpeakLeash and ACK Cyfronet AGH
PLLUM
Polish model, HIVE consortium commissioned by the Ministry of Digitization
Qwen
Alibaba
GLM
Zhipu AI
DeepSeek
DeepSeek

We select a model for the task and check it on your cases. We run it, tune it and maintain it.

Source: Bielik and PLLuM, ACK Cyfronet AGH ↗ · PLLuM, Ministry of Digitization ↗

Do you have a lot of your own data? We will fine-tune the small model.

  1. 1 Your examples
  2. 2 tuning
  3. 3 test on new cases
  4. 4 model at your place

When you have thousands of similar emails, documents or reports, we teach a small open model based on your examples. It works for you, responds quickly and costs less to maintain than a large model. We measure quality on issues that the model has not seen while learning.

Przemysław and Piotr did it in large programming and consulting companies. Artem did it before and does it today at Syntalith. It's about models on your own infrastructure, tuning and quality measurement.

You choose the protection level during the interview. We sign the data processing agreement before we see any data.Schedule a free analysis →

Private AI models

A model on your server or in the cloud in the EU, proven on your tasks.

We select the model and equipment for the task, run it and measure the quality using your examples before you buy anything. The data stays in the company or in the cloud in the EU. We price implementation, hardware or hosting and support separately after analysis.

View private AI models →
model on your server or in the cloud in the EU
quoted after the review
same work in application with EU cloud model
from €3,000
task, data and equipment analysis
€0

Questions

  • How do you accept a fine-tuning project?

    On a set of cases the model has not seen, against criteria agreed before the project, with a comparison to a simpler change and a description of the errors that remain.

  • What should a fine-tuning contract say?

    The model version to be accepted, the test set, the correctness criteria, the acceptable errors, the owner of corrections after acceptance and how the model is reassessed after a change of base model.

  • How much does fine-tuning a model cost?

    An AI application at Syntalith costs from €3,000 net, and we price adapting the model after comparing it with a simpler change on cases the model has not seen. In the scenario, fine-tuning adds 10 hours (€349) a month beyond what a clear instruction with sources gives.

Let's talk

Just write, call or choose a date.

We work fast because we hate corporate cotton wool. We don't have salespeople or managers to keep an eye on managers. You talk immediately to engineers who then build your system. We respect each other's time and yours too.

We will accept 3 more companies by the end of the year.

Mon–Fri 9:00–17:00 CET

What our OpenAI and Anthropic partnerships mean for you.

OpenAI makes ChatGPT and Anthropic makes Claude. We belong to the partnership programs of both companies, so we work with their tools every day and learn from the creators themselves.

OpenAI Select PartnerClaude Partner Network
01We will select a tool for the task
We implement both ChatGPT and Claude. We check both on your documents, and you choose the one that makes fewer corrections and saves more time.
02Knowledge straight from the creators
We learn from official OpenAI and Anthropic courses and materials. Your team learns about the features and settings that work today.
03Licenses without our margin
When we roll out ChatGPT, Claude or Copilot, you buy the licences directly from OpenAI, Anthropic or Microsoft and they invoice you. We add nothing to the licence.
04Certified engineers
On the team, we have an AWS certification in machine learning and an Anthropic certification in systems architecture on Claude.

Participation in programs does not mean that OpenAI or Anthropic endorses our services.