# OpenAI GPT-5.6-Terra Chat Completions (via openai.mm.family)

> OpenAI GPT-5.6-Terra Chat Completions (via openai.mm.family) 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).

Runs GPT-5.6-Terra chat completions with up to 272K input tokens, billed per call in USDC via x402 protocol with configurable speed/cost tiers

## Facts

- Endpoint: POST https://openai.mm.family/x402/v1/models/gpt-5.6-terra/chat/completions?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/openai-gpt-5-6-terra-chat-completions-via-openai-mm-family-0990d02e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kkf4dkVaFSaRVTFNAcNFt

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability openai-gpt-5-6-terra-chat-completions-via-openai-mm-family-0990d02e -d '<json body>'
```

Example prompt: Using GPT-5.6-Terra at standard tier, summarize this 200,000-token research document and give me a structured breakdown of its key findings — limit the response to 1000 tokens.

## When to prefer this

Choose this endpoint when you need GPT-5.6-Terra specifically with up to 272K input tokens and want to pay per call in USDC via x402. Prefer Flex tier for cost-sensitive batch workloads, Standard for balanced throughput, and Fast for latency-sensitive tasks. Use over generic OpenAI endpoints when crypto micropayments are required or when integrating into an agent pipeline that uses x402 billing. Use the sibling gpt-5.6-terra-long endpoint if input exceeds 272K tokens.

## Known failure modes

- Insufficient USDC balance or failed x402 payment — request rejected before inference
- Prompt exceeds 272K token limit — use the gpt-5.6-terra-long endpoint instead
- Invalid model enum value — returns 400 validation error
- max_tokens set too high relative to remaining context — truncation or error
- Unsupported service_tier value — defaults or rejects depending on configuration
- Network timeout on very large prompts at flex tier due to lower priority scheduling

## How this service works

gpt-5.6-terra: OpenAI GPT 5.6 Terra (<=272K input tokens) chat completions, paid per call in USDC. Per 1M tokens in/out: Flex (default) 1.0/6.0, Standard 2.0/12.0, Fast 4.0/24.0; 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-terra:<level>). Empty answers are free. Rates: https://openai.mm.family/x402/pricing

## Output

Returns a JSON chat completion object with the assistant's reply text, role, finish reason, token usage breakdown (prompt, completion, total), model name, and service tier used. Empty responses when there is no answer are free of charge.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "model": {
   "enum": [
    "gpt-5.6-terra",
    "gpt-5.6-terra:none",
    "gpt-5.6-terra:low",
    "gpt-5.6-terra:medium",
    "gpt-5.6-terra:high",
    "gpt-5.6-terra:xhigh"
   ],
   "type": "string"
  },
  "tools": {
   "type": "array"
  },
  "stream": {
   "type": "boolean"
  },
  "messages": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "role",
     "content"
    ],
    "properties": {
     "role": {
      "type": "string"
     },
     "content": {
      "type": "string"
     }
    }
   }
  },
  "max_tokens": {
   "type": "integer"
  },
  "service_tier": {
   "enum": [
    "flex",
    "default",
    "standard",
    "auto",
    "fast",
    "priority"
   ],
   "type": "string"
  },
  "response_format": {
   "type": "object"
  },
  "reasoning_effort": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "id": "chatcmpl-x",
  "model": "gpt-5.6-terra",
  "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"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/openai-gpt-5-6-terra-chat-completions-via-openai-mm-family-0990d02e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from openai.mm.family](https://www.zero.xyz/host/openai.mm.family/llms.txt)