# OpenAI gpt-6.1-sol-long (Long-Context Chat Completions)

> OpenAI gpt-6.1-sol-long (Long-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).

Runs OpenAI GPT-6.1 Sol chat completions with >272K input token context, billed per call in USDC via x402 protocol

## Facts

- Endpoint: POST https://openai.mm.family/x402/v1/models/gpt-6.1-sol-long/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-6-1-sol-long-long-context-chat-completions-3e233cec
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vS2aAhy5I1mBVbYPUiDf1

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-6-1-sol-long-long-context-chat-completions-3e233cec -d '<json body>'
```

Example prompt: Using GPT-6.1 Sol long-context mode, summarize the following 300,000-token research corpus and give me a structured executive summary — use the flex service tier and cap the output at 2000 tokens.

## When to prefer this

Choose this endpoint when you need GPT-6.1 Sol with more than 272K tokens of input context and want per-call USDC micropayment billing without a standing OpenAI subscription. It is especially suited for agents that process book-length documents, large codebases, or long multi-turn histories, and need to pay only for what they use. If your input is under 272K tokens, the non-long sibling (gpt-6.1-sol) may be more cost-effective.

## Known failure modes

- Insufficient USDC balance or failed x402 payment — returns 402 Payment Required
- Input token count exceeds model maximum — returns 400 with token limit error
- Invalid model variant or service_tier enum value — returns 400 validation error
- max_tokens quota exceeded for the funded amount — call may be rejected before processing
- Rate limiting on the mm.family proxy — returns 429 Too Many Requests
- Model unavailable or upstream OpenAI outage — returns 503 or 500

## How this service works

gpt-6.1-sol-long: OpenAI GPT 6.1 Sol (>272K input tokens) chat completions, paid per call in USDC. Per 1M tokens in/out: Flex (default) 2.0/7.5, Standard 4.0/15.0, Fast 8.0/30.0; 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-long:<level>). Empty answers are free. Rates: https://openai.mm.family/x402/pricing

## Output

A JSON chat.completion object containing the assistant's reply message, token usage breakdown (prompt, completion, total), finish reason (e.g. 'stop'), the model variant used, and the service tier that processed the request.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "model": {
   "enum": [
    "gpt-6.1-sol-long",
    "gpt-6.1-sol-long:low",
    "gpt-6.1-sol-long:medium",
    "gpt-6.1-sol-long:high",
    "gpt-6.1-sol-long: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-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"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/openai-gpt-6-1-sol-long-long-context-chat-completions-3e233cec/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)