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POST https://inference-api.openserv.ai/v1/responses
OpenAI Responses format. Use it to receive the reasoning trace alongside the answer. OpenAI models only — other models are not supported on this endpoint. Use chat completions for everything else.

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Request

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Authorization
string
required
Bearer $SERV_API_KEY.
​
model
string
required
An OpenAI model ID from the catalog, for example gpt-5.4.
​
input
string | array
required
The prompt — a string, or an array of input items.
​
instructions
string
required
The system prompt. SERV requires one.
​
reasoning
object
Reasoning controls, for example { "effort": "medium", "summary": "auto" }.
​
max_output_tokens
integer
Maximum number of tokens to generate.
​
tools
array
Function definitions, in OpenAI format.
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stream
boolean
default:"false"
Stream the response as server-sent events.
All other OpenAI Responses parameters are accepted and forwarded to the model.

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Response

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id
string
Unique identifier for the response.
​
object
string
Always "response".
​
model
string
The model used.
​
output_text
string
Convenience field with the generated text.
​
output
array
The full output items, including reasoning items when reasoning is enabled.
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usage
object
Token counts: input_tokens, output_tokens, total_tokens.
curl https://inference-api.openserv.ai/v1/responses \
  -H "Authorization: Bearer $SERV_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.4",
    "instructions": "You are a careful reasoner.",
    "input": "Hello!"
  }'

import OpenAI from "openai";

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

const response = await client.responses.create({
  model: "gpt-5.4",
  instructions: "You are a careful reasoner.",
  input: "Hello!",
});

{
  "id": "resp_...",
  "object": "response",
  "model": "gpt-5.4",
  "output_text": "Hello! How can I help?",
  "output": [
    {
      "type": "message",
      "role": "assistant",
      "content": [{ "type": "output_text", "text": "Hello! How can I help?" }]
    }
  ],
  "usage": { "input_tokens": 16, "output_tokens": 7, "total_tokens": 23 }
}