When enterprises purchase LLM API, they should not only compare single prices. What really affects the cost of going online is: whether the model covers business needs, whether keys can be isolated by project, whether bills can be verified, how to deal with failures, and whether future migration can be smooth.
This article is a pre-purchase checklist and does not constitute a contract, SLA or invoice commitment. Specific recharges, discounts, invoicing information and service scope should be confirmed by corporate customers and AIFast customer service.
What to prepare before contacting customer service
First organize a one-page demand list to avoid just saying "a stable API is needed":
| Project | Suggested content |
|---|---|
| main scene | Customer service, code, knowledge base, content generation, images, videos or internal automation |
| target model | The exact model ID currently in the console, not just the manufacturer name |
| Estimated monthly usage | Text Token, number of pictures, video duration or number of tasks |
| Peak concurrency | Number of simultaneous requests, queue length, acceptable waiting time |
| Deployment location | Cloud vendors, regions, operators and egress networks |
| Project isolation | Whether a department, environment, customer or line of business requires independence Key |
| financial needs | Recharge subject, billing cycle, invoice header and required information |
| Online time | Trial, staged rollout, and production cutover schedule |
Enterprise consultation portal:Contact AIFast customer service. Do not send the full API Key in public tickets, group chats, or screenshots.
What should technical acceptance cover?
1. Account and authentication
- Create independent keys for testing, production and different projects.
- Verify Key creation, revocation, and rotation processes.
- Confirmation logs, tickets, and screenshots hide the key.
- use
GET /v1/modelsCheck the model ID that is truly available in the current account.
2. Business capabilities
At least use real business samples to verify respectively:
- Normal text and long context.
- Streaming SSE.
- Tool calls or structured output.
- APIs that are actually needed for pictures, videos, Embedding, Rerank, etc.
- 429, 5xx, timeouts, and behavior when the client cancels the request.
Successful basic dialogue does not prove that all abilities are compatible. Different capabilities may use different protocols, endpoints, and billing units.
3. Stability and capacity
The trial run report records at least the test time, region, network, model, sample size, number of successes, P50, P95 and status code distribution. Don't substitute an HTTP 200 or a quick request for a capacity conclusion.
Confirm before going online:
- Total client timeout and single request timeout.
- 429, 5xx capped retries and random jitter.
- Whether automatic retries are allowed for non-idempotent tasks.
- Queuing, downgrading and manual processing during peak periods.
- Migration steps after model maintenance or offline.
How to accept bills and costs
The following fields are saved from the commissioning phase:
{
"project": "support-bot",
"environment": "production",
"model": "MODEL_ID_FROM_CONSOLE",
"request_id": "REDACTED",
"status": 200,
"input_usage": 0,
"output_usage": 0,
"retry_count": 0
}Application logs are used to analyze business usage, and financial reconciliation should be based on console bills and current billing rules. Image, video, and retrieval tasks cannot directly apply text token formulas.
It is recommended to summarize weekly by project, key, model, status code and number of retries, giving priority to infinite retries, context expansion, repeated tasks and abnormally high-frequency calls.
Invoice confirmation checklist
Before recharging, please confirm with customer service:
- Currently supported recharge and invoicing processes.
- Invoicing subject, header, tax number and required information.
- Invoice content, amount and application time requirements.
- Whether the account subject, payment subject and invoice header need to be consistent.
- Contracts or other documents required for special procurement processes.
These matters may change with policies and platform procedures, and are ultimately subject to customer service confirmation. "Enterprise can invoice" on the page does not mean that all orders can be invoiced automatically.
Migration and exit costs
Keep the exit path before purchasing:
- Base URL, Key and model ID use environment variables and are not hard-coded in business code.
- Centralize vendor-specific parameters in the adaptation layer.
- Save a set of fixed business problem sets and expected output rules.
- Record model capability differences and do not perform silent cross-model substitutions.
- Regularly practice key rotation, model switching, and service degradation.
If the application uses the OpenAI Compatible API, it must also verify Chat Completions, Responses, tool calls, image and video capabilities separately. "Compatible" cannot be understood to mean that all APIs are exactly the same.
Proposed procurement acceptance results
The result should be an acceptance form that can be signed or filed:
| Acceptance items | pass standard | evidence |
|---|---|---|
| Model scope | The target model can be queried in the current account and the real request is successful. | /models Responding to desensitization requests |
| Core functions | Fixed business samples meet the standards set by the team | Question sets, scoring and failure samples |
| Stability | Meet the team’s own test window goals | Sample size, P50/P95, error distribution |
| cost | Single task cost and budget protection acceptable | Console billing and application summary |
| safe | Key isolation, rotation, desensitization and permission process completed | Configuration checklist and drill records |
| Finance | Recharge, billing, and invoice processes have been confirmed | Customer service confirmation and company information |
| Migrate | Able to replace addresses, keys and models and complete regression | Grayscale and rollback recording |
FAQ
Do corporate purchases require a separate account?
Depends on team permissions, project isolation and financial processes. At least independent keys should be used to distinguish testing, production, and different businesses to avoid sharing a long-term key among all projects.
Is 99% model availability equal to contractual SLA?
Not equal to. Platform operation data, test window success rate and contract SLA are three different calibers. Formal SLAs, billing periods and areas of responsibility need to be confirmed individually.
When is the right time to contact Enterprise Support?
When the monthly usage, concurrency, invoicing or purchasing process is relatively clear, it is most efficient to contact us with the requirement form in this article. Still in the selection stage, you can check firstCurrent models and pricesand complete small-scale testing.