# OpenAI GPT-6 Sol Chat Completions (x402/USDC)

> OpenAI GPT-6 Sol Chat Completions (x402/USDC) is a paid API for AI agents from openai.mm.family, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-03).

Provides OpenAI GPT-6 Sol chat completions (up to 272K input tokens) via a pay-per-call API priced in USDC using the x402 payment protocol

## Facts

- Endpoint: POST https://openai.mm.family/x402/v1/models/gpt-6-sol/chat/completions?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-03
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/openai-gpt-6-sol-chat-completions-x402-usdc-9be80128
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gMUPE2QYRcbDlmM63SS0U

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-6-sol-chat-completions-x402-usdc-9be80128 -d '<json body>'
```

Example prompt: Use GPT-6 Sol at the standard service tier to answer the following conversation — system: 'You are a helpful assistant', user: 'Explain quantum entanglement in two sentences' — with a max of 300 output tokens.

## When to prefer this

Choose this endpoint when you need GPT-6 Sol specifically (OpenAI's high-capability model at up to 272K context) and want to pay per call in USDC via the x402 micropayment protocol — ideal for agents that need crypto-native billing without a monthly subscription. Prefer the flex tier for cost sensitivity, standard for balanced throughput, or fast tier for latency-critical paths. Use gpt-6-sol:<level> variants when you need explicit reasoning effort control. If you need more than 272K context, look at a '-long' sibling endpoint instead.

## Known failure modes

- Insufficient USDC balance or x402 payment failure — returns 402 Payment Required
- Exceeding 272K input token context window — returns 400 Bad Request
- Invalid model variant string — returns 400 with enum validation error
- max_tokens set too high causing over-quota charge — quote is input tokens + 10% of max_tokens
- Stream mode errors if downstream connection drops mid-stream
- Rate limiting at the proxy layer if request volume spikes
- Invalid messages array format (missing role or content fields) — returns 422

## How this service works

gpt-6-sol: OpenAI GPT 6 Sol (<=272K input tokens) chat completions, paid per call in USDC. Per 1M tokens in/out: Flex (default) 1.0/5.0, Standard 2.0/10.0, Fast 4.0/20.0; 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-6-sol:<level>). Empty answers are free. Rates: https://openai.mm.family/x402/pricing

## Output

Returns a JSON object containing the assistant's reply message, finish reason (e.g. 'stop'), token usage breakdown (prompt, completion, total), model name, service tier used, and a unique completion ID. Empty completions (e.g. refused or zero-length answers) are billed at $0.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "model": {
   "enum": [
    "gpt-6-sol",
    "gpt-6-sol:none",
    "gpt-6-sol:low",
    "gpt-6-sol:medium",
    "gpt-6-sol:high",
    "gpt-6-sol: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-6-sol",
  "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-6-sol-chat-completions-x402-usdc-9be80128/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)