OpenAI GPT-5.6 Luna Long (>272K context) Chat Completions

x402

OpenAI GPT-5.6 Luna Long (>272K context) Chat Completions is a paid API for AI agents from openai.mm.family, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).

Provides paid chat completions using OpenAI GPT-5.6 Luna model with extended context (>272K input tokens), billed per call in USDC via x402 protocol

Price / call$0.001

Seller volume →—

Success—

StatusUnknown

How this service works

gpt-5.6-luna-long: OpenAI GPT 5.6 Luna (>272K input tokens) chat completions, paid per call in USDC. Per 1M tokens in/out: Flex (default) 0.2/0.9, Standard 0.4/1.8, Fast 0.8/3.6; 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-5.6-luna-long:<level>). Empty answers are free. Rates: https://openai.mm.family/x402/pricing

Output

Returns a chat completion object in OpenAI-compatible format, including the assistant's reply message, finish reason (e.g. 'stop'), token usage breakdown (prompt, completion, total), model name, and service tier used. Empty answers are provided free of charge.

Example use cases

Long document summarization with Luna

“I've got a massive 300-page research report — can you send the full text to GPT-5.6 Luna long context and ask it to produce a concise executive summary? Use the flex tier and cap the output at 1500 tokens.”

Extended conversation reasoning agent

“I need to continue a very long multi-turn conversation with a GPT-5.6 Luna model — the history is huge, well over 300K tokens. Please use the high reasoning level and fast service tier so I get a quick, high-quality reply.”

Code review across a large codebase

“Can you send the entire contents of my project's source files — probably around 350K tokens worth — to GPT-5.6 Luna long context and ask it to identify security vulnerabilities? Use the xhigh quality level and standard tier.”

Technical details

Endpoint

POSThttps://openai.mm.family/x402/v1/models/gpt-5.6-luna-long/chat/completions?utm_source=zero.xyz

When to prefer

Choose this endpoint when your input conversation or document exceeds 272K tokens and you need GPT-5.6 Luna's specific capability profile. Prefer over the standard gpt-5.6-luna (short context) endpoint when inputs are very large. Prefer over gpt-6-astra-long if cost is a priority and GPT-5.6 quality suffices. Use when you need x402 USDC micropayment billing and want to select between flex, standard, or fast inference tiers.

Side effects

Insufficient USDC balance or failed x402 payment results in 402 Payment Required
Exceeding model's maximum context length returns a context length error
Invalid model variant string returns a 400 validation error
service_tier enum mismatch (e.g. unsupported value) returns 400
max_tokens set too high relative to remaining context causes truncation or error
Rate limiting at the provider level may return 429 Too Many Requests

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-5.6-luna-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"
  }
}

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