Chat & Responses

Use the request format your application already understands. The format does not determine the underlying provider: an OpenAI-compatible request can still target a supported Claude, Gemini, Qwen, or other model.

Format	Route	Best for
OpenAI Chat Completions	`POST /v1/chat/completions`	Existing OpenAI SDK integrations
OpenAI Responses	`POST /v1/responses`	New OpenAI-style applications and tool use
Anthropic Messages	`POST /v1/messages`	Raw Anthropic-style requests
Anthropic SDK	`POST /anthropic/v1/messages`	Existing Anthropic SDK integrations
Other native Anthropic	`/anthropic/v1/*`	Anthropic endpoints other than Messages

OpenAI-Compatible Chat

TypeScript
Python
cURL

import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.inquantum.ai/v1",
  apiKey: process.env.PLANCK_API_KEY,
});

const response = await client.chat.completions.create({
  model: "gpt-4o-mini",
  messages: [
    { role: "user", content: "Explain vector search in one sentence." },
  ],
});

console.log(response.choices[0].message.content);

import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.inquantum.ai/v1",
    api_key=os.environ["PLANCK_API_KEY"],
)

response = client.chat.completions.create(
    model="gpt-4o-mini",
    messages=[{"role": "user", "content": "Explain vector search in one sentence."}],
)

print(response.choices[0].message.content)

curl https://api.inquantum.ai/v1/chat/completions \
  -H "Authorization: Bearer $PLANCK_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-4o-mini",
    "messages": [
      {"role": "user", "content": "Explain vector search in one sentence."}
    ]
  }'

Set stream: true to receive the response incrementally with server-sent events. The streaming guide includes complete TypeScript, Python, cURL, and raw SSE examples. See Chat Completions for the complete request schema.

Responses API

curl https://api.inquantum.ai/v1/responses \
  -H "Authorization: Bearer $PLANCK_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-4o-mini",
    "input": "Explain vector search in one sentence."
  }'

See Responses API for supported request behavior.

Reasoning and thinking

OpenAI-compatible requests use reasoning_effort and include_reasoning. Anthropic-compatible requests use thinking and output_config.effort. Planck normalizes both formats before routing the request. See Reasoning and thinking for cURL, OpenAI SDK, and Anthropic SDK examples.

Anthropic-Compatible Messages

The mapped Messages route accepts Anthropic-style inputs and returns an Anthropic-style response while retaining gateway routing, billing, and observability.

curl https://api.inquantum.ai/v1/messages \
  -H "Authorization: Bearer $PLANCK_API_KEY" \
  -H "Content-Type: application/json" \
  -H "anthropic-version: 2023-06-01" \
  -d '{
    "model": "claude-4.5-sonnet",
    "max_tokens": 256,
    "messages": [
      {"role": "user", "content": "Explain vector search in one sentence."}
    ]
  }'

max_tokens is required for Anthropic-compatible Messages requests. To use the Anthropic SDK, set its base URL to https://api.inquantum.ai/anthropic and pass your Planck API key to the SDK’s api_key option. The SDK appends /v1/messages. See Anthropic-compatible routes for a complete SDK example and the distinction between mapped Messages and other native endpoints.

Observability

Successful and failed generations appear in Requests with their model, provider, tokens, duration, cost, user, custom properties, and response status. Add your own user, session, or property headers when you need application-level attribution.

Configure routing and BYOK

Choose providers, supply provider keys, and configure fallbacks.

Get Started

Models & Inference

Reliability & Controls

Observability

Prompt Management

Integrations

Chat & Responses

OpenAI-Compatible Chat

Responses API

Reasoning and thinking

Anthropic-Compatible Messages

Observability

Configure routing and BYOK

​OpenAI-Compatible Chat

​Responses API

​Reasoning and thinking

​Anthropic-Compatible Messages

​Observability

Configure routing and BYOK

OpenAI-Compatible Chat

Responses API

Reasoning and thinking

Anthropic-Compatible Messages

Observability