# GPT-6.1 Sol Chat Completions (<=272K tokens) via mm.family

> GPT-6.1 Sol Chat Completions (<=272K tokens) via 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).

Calls OpenAI GPT-6.1 Sol for chat completions (up to 272K input tokens) with per-call USDC micropayment via x402 protocol

## Facts

- Endpoint: POST https://openai.mm.family/x402/v1/models/gpt-6.1-sol/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/gpt-6-1-sol-chat-completions-272k-tokens-via-mm-family-e5ad0608
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3_aWeCzkPg9YzGP1KS0pH

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 gpt-6-1-sol-chat-completions-272k-tokens-via-mm-family-e5ad0608 -d '<json body>'
```

Example prompt: Using GPT-6.1 Sol on the standard service tier, answer this question with up to 500 tokens: 'What are the key differences between supervised and reinforcement learning, and when should each be used?'

## When to prefer this

Choose this endpoint when you need OpenAI's newest and most capable GPT-6.1 Sol model with inputs up to 272K tokens, want to pay per call in USDC without a subscription, need flexible service tier pricing (flex/standard/fast), or are building agentic workflows that require crypto-native micropayments via x402. Use the sibling gpt-6.1-sol-long endpoint for inputs exceeding 272K tokens.

## Known failure modes

- Insufficient USDC balance causes payment failure and 402 response
- Exceeding 272K input token limit returns an error (use gpt-6.1-sol-long sibling instead)
- Invalid service_tier or model enum value returns a validation error
- max_tokens set too high may inflate the quoted charge even if fewer tokens are used
- Streaming (stream:true) behavior may vary depending on x402 proxy support
- Model may return a refusal (finish_reason: content_filter) for policy-violating inputs

## How this service works

OpenAI's newest model. gpt-6.1-sol: OpenAI GPT 6.1 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: low, medium, high, xhigh (model gpt-6.1-sol:<level>). Empty answers are free. Rates: https://openai.mm.family/x402/pricing

## Output

Returns a JSON chat completion object containing the assistant's reply text, role, finish reason, token usage breakdown (prompt, completion, total), model name, service tier used, and a unique completion ID. Empty completions are returned free of charge.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "model": {
   "enum": [
    "gpt-6.1-sol",
    "gpt-6.1-sol:low",
    "gpt-6.1-sol:medium",
    "gpt-6.1-sol:high",
    "gpt-6.1-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-6.1-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/gpt-6-1-sol-chat-completions-272k-tokens-via-mm-family-e5ad0608/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)