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OpenAI gpt-5.4-long Chat Completions (via mm.family x402)
x402
OpenAI gpt-5.4-long Chat Completions (via mm.family x402) is a paid API for AI agents from openai.mm.family, paid per call via x402, $0.001091/call, status unknown (last checked 2026-10-02).
Runs GPT-5.4 chat completions for long-context inputs (>272K tokens), billed per call in USDC via x402 micropayment protocol
Price / call$0.001091
Success—
StatusUnknown
How this service works
gpt-5.4-long: OpenAI GPT 5.4 (>272K input tokens) chat completions, paid per call in USDC. Per 1M tokens in/out: Flex (default) 2.5/11.25, Standard 5.0/22.5; pick with service_tier. Plus $0.0005 (Base) or $0.0005 (Solana) per call; the quote charges input plus 10% of max_tokens. Levels: none, low, medium, high, xhigh (model gpt-5.4-long:<level>). Empty answers are free. Rates: https://openai.mm.family/x402/pricing
Output
Returns a JSON chat completion object containing the assistant's reply message, finish reason (e.g. 'stop'), input/output token counts, the model variant used, and the service tier that handled the request (flex or standard).
Example use cases
Long document legal analysis
“I have a 300,000-token legal contract — run it through GPT-5.4-long on standard tier with up to 4000 output tokens and summarize every clause that creates financial liability for my company.”
Large codebase refactoring advice
“Feed this entire repository into GPT-5.4-long using flex tier and ask it to suggest a refactoring plan to improve modularity, with max 3000 tokens in the response.”
Extended research paper synthesis
“I have 50 academic papers concatenated together — use GPT-5.4-long at high reasoning level with standard service tier and max 5000 tokens to write a literature review synthesizing the key findings.”
Technical details
Endpoint
POSThttps://openai.mm.family/x402/v1/models/gpt-5.4-long/chat/completions?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to process inputs exceeding 272K tokens with GPT-5.4 quality, and you want to pay per-call in USDC without a traditional OpenAI subscription. Prefer the flex tier for cost-sensitive batch tasks and standard tier for latency-sensitive or priority workloads. If your context fits under 272K tokens, prefer the non-long gpt-5.4 variant to save on per-call costs.
Side effects
- Insufficient USDC balance causes payment failure and request rejection
- Exceeding the model's absolute context window returns a context length error
- Invalid service_tier enum value returns a 400 validation error
- Empty or malformed messages array causes a 422 unprocessable entity error
- Requesting a model variant not in the enum (e.g. gpt-5.4-long:ultrahigh) returns a 400 error
- Network timeout on very large payloads if the request body is too large
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| model | string | |
| tools | array | |
| stream | boolean | |
| messages | array | |
| max_tokens | integer | |
| service_tier | string | |
| response_format | object | |
| reasoning_effort | string |
Output
Schema · Response
{
"type": "json",
"example": {
"id": "chatcmpl-x",
"model": "gpt-5.4-long",
"usage": {
"total_tokens": 9,
"prompt_tokens": 8,
"completion_tokens": 1
},
"object": "chat.completion",
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "Hello",
"refusal": null
},
"finish_reason": "stop"
}
],
"service_tier": "flex"
}
}Tags
x402
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