GPT 5.4

OpenAI GPT 5.4 — flagship general-purpose language model.

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LLMopenai/gpt-5.4$1.25 / 1M inFeatured

Base URL

https://api.zekron.tech/api/v1

Supported modes

chattool-use

Parameters

Pass these inside the input object when creating a task.

Field	Required
messages	required
temperature	optional
max_tokens	optional
tools	optional
reasoning_effort	optional

messagesrequired

temperatureoptional

max_tokensoptional

toolsoptional

reasoning_effortoptional

Example request

bash

curl -X POST https://api.zekron.tech/api/v1/tasks \
  -H "Authorization: Bearer zk_live_xxx" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "openai/gpt-5.4",
  "input": {
    "messages": "..."
  }
}'

Example response

json

{
  "id": "zk_task_8f3a2b1c9d",
  "model": "openai/gpt-5.4",
  "status": "processing",
  "created_at": "2026-06-10T12:00:00Z"
}

Poll GET https://api.zekron.tech/api/v1/tasks/{id} until status is success or failed.

Pricing

This model is billed at $1.25 / 1M in. You are only charged for successful generations — failed tasks are never billed. Generated outputs are retained for 30 days before they expire.