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OpenAI API implementation: workflow, costs and acceptance
Short answer
The OpenAI API brings a model into a process run by the company's software. When an enquiry arrives, the system reads the requirements, checks the catalogue and saves a draft quote for approval in the CRM. At Syntalith such an integration costs from €3,000 net. At 400 enquiries a month the GPT-6.1 Sol model costs about €11, and the implementation pays back in 1 month.
How we workDetails ↓
- 01Call30 minutes with an engineer, free
- 02PrototypeA working system on your process and data, free
- 03ImplementationTarget and fixed price in the contract; 50% at signing
- 04Acceptance50% once the agreed target is met
- analysis with an engineer and a free prototype
- €0
- team in ChatGPT or Claude, up to 10 people
- from €1,150
- automation, agent or application for one process
- from €3,000
We belong to the OpenAI and Anthropic partner programmes and learn through their official courses. What this means ↓
Author: Syntalith · 3 min read
Statistics
Model APIs in companies: statistics 2026
1.0 mo.
payback of a €3,000 integration at 400 quote requests a month: €3,490 by hand, €535 with checking and the model. Scenario.
40%
According to Menlo Ventures (2025), Anthropic holds 40% of large companies' spending on language model APIs and OpenAI 27%, based on a survey of about 500 US decision-makers.
Source: Menlo Ventures, State of Generative AI in the Enterprise (2025) ↗
40%
According to Gartner (2025), over 40% of agentic AI projects will be cancelled by the end of 2027 because of costs, unclear value or weak risk controls.
50%
According to the European Commission (2026), half of EU SMEs and mid-caps name high investment costs as a barrier to AI.
Source: European Commission, Flash Eurobarometer on AI (2026) ↗
14–56%
According to Anthropic (2025), AI cut task time by 14 to 56% in studies with a control group.
Source: Anthropic, Estimating AI productivity gains (2025) ↗
Figures checked: 22 October 2026
When the API is justified
If an employee chooses the documents and leads the analysis personally, a company ChatGPT plan may be enough. The API helps when you need your own trigger, data format, permissions and a write of the result. The differences in what you buy are covered in the guide a ChatGPT subscription or the API.
An employee chooses the files and leads the analysis
ChatGPT Business
rollout from €1,150
Every new enquiry from a form goes to the CRM
an integration through the API
from €3,000
Many steps, tools and decisions in one case
an AI agent on the API
from €3,000
From an enquiry to a draft quote
- 01IntakeThe system gives the enquiry an ID and checks it was not processed before.
- 02ReadingThe model returns the requirements in a set format, with the gaps.
- 03CatalogueThe app pulls products and prices from an authorised source, and code checks the numbers and discounts.
- 04DraftA reply is created with links to the sources and data to confirm.
- 05WriteAfter approval the app saves the result, and sending has its own permission.
Structured Outputs gives an answer that matches the schema, but you check the correctness of the values separately: a valid price field can hold a wrong price. With tool calling, the app is responsible for authorising and carrying out the operation.
What the integration costs and when it pays back
- Today
- 400 enquiries × 15 min = 100 h (€3,490)
- With the system a person checks the output in 15% of the time
- €524
- Model, 2 calls per case, GPT-6.1 Sol
- €11
- Cost of one case
- €8.73 today, €1.34 with the system
- Saving
- €2,955 a month
Payback of €3,000
1.0 month
The volume, the time and the checking share are the scenario's assumptions. €34.90 an hour is the EU average hourly labour cost for 2025 according to Eurostat. Model: 4,000 input tokens and 800 output tokens per call at OpenAI's rates, at the ECB rate of 1.1205 USD per euro on 22 October 2026.
GPT-6.1 Sol costs $2 per million input tokens and $10 per million output tokens according to the OpenAI API price list. At 10,000 calls with 2,000 input tokens and 500 output tokens each, that is 20 × 2 + 5 × 10 = $90 a month, which is €80. One case can need several calls, so count the billed usage from the console, including reasoning tokens. A comparison of models at the same volume is in the OpenAI and Claude API price guide.
Which safeguards belong to the implementation
The API key runs on the server side, the test environment is kept apart from production, and access is assigned to a project. Treat a document from a customer as input data, even when it contains instructions. Reading the catalogue, changing a discount and sending a quote have different consequences, so you enforce the limits in code and in account permissions.
OpenAI offers alerts and enforced spending limits for the organisation and the project. Enforcement is not instant, so the app recognises a rejected request and passes the task to the queue without retrying in a loop (spending limits).
What to check before launch
- An enquiry with a missing price and conflicting requirements
- The CRM unavailable during the write
- The same event delivered again without a second quote
- Stopping the work and a person taking the case over by hand
- New examples that were not used to refine the instruction
Sign-off covers the correctness of the data, permissions, the salesperson's time including corrections and the cost of an accepted case. If quality is too low, narrow the scope before raising the volume. Also check results on a new batch of cases, because an instruction refined on one set can get worse on the next. Syntalith holds OpenAI Select Partner status. We discuss the integration as part of AI apps, and for the conversation a description of your systems, the number of cases a month and an example of the expected result are enough.
Worked example · Scenario
How we count the payback: quotes from customer enquiries
We run the same count for your process in the free process review.
€2,094
a month for preparing 120 quotes from customer enquiries by hand
Payback: 1.7 mo.
30 minutes per quote from an enquiry and checking in 15% of the old time are our assumptions. €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 4,000 + 1,500 tokens per draft quote, at the ECB rate of 1.1205 USD per euro on 22 October 2026. The extra margin is a scenario: we assume that 1 in 40 enquiries quoted the same day ends in an order that a slow reply loses today, with a margin of €344. In the review we count it on your sales process.
See the full calculation →
