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POST https://inference-api.openserv.ai/v1/chat/completions
OpenAI Chat Completions format. The universal endpoint — works with every model in the catalog.

​
Request

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Authorization
string
required
Bearer $SERV_API_KEY.
​
model
string
required
Model ID from the catalog, for example gpt-5.4-mini.
​
messages
array
required
The conversation so far. Must include a system or developer message. Each entry has a role (system, user, assistant, or tool) and content.
​
max_completion_tokens
integer
Maximum number of tokens to generate.
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reasoning_effort
string
Reasoning depth for reasoning-capable models.
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temperature
number
Sampling temperature.
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tools
array
Function definitions, in OpenAI format: { type: "function", function: { name, parameters } }.
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tool_choice
string | object
"auto", "none", or { type: "function", function: { name } }.
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stream
boolean
default:"false"
Stream the response as server-sent events.
All other OpenAI Chat Completions parameters are accepted and forwarded to the model.

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Response

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id
string
Unique identifier for the completion.
​
object
string
Always "chat.completion".
​
model
string
The model used to generate the completion.
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choices
array
The generated completions. choices[0].message.content holds the text.
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usage
object
Token counts: prompt_tokens, completion_tokens, total_tokens.
curl https://inference-api.openserv.ai/v1/chat/completions \
  -H "Authorization: Bearer $SERV_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.4-mini",
    "messages": [
      {"role": "system", "content": "You are a concise assistant."},
      {"role": "user", "content": "Hello!"}
    ]
  }'

import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://inference-api.openserv.ai/v1",
  apiKey: process.env.SERV_API_KEY,
});

const completion = await client.chat.completions.create({
  model: "gpt-5.4-mini",
  messages: [
    { role: "system", content: "You are a concise assistant." },
    { role: "user", content: "Hello!" },
  ],
});

{
  "id": "chatcmpl-...",
  "object": "chat.completion",
  "model": "gpt-5.4-mini",
  "choices": [
    {
      "index": 0,
      "message": { "role": "assistant", "content": "Hello! How can I help?" },
      "finish_reason": "stop"
    }
  ],
  "usage": { "prompt_tokens": 18, "completion_tokens": 7, "total_tokens": 25 }
}