ZeroReader GPT-OSS 120B Chat Completion

x402

ZeroReader GPT-OSS 120B Chat Completion is a paid API for AI agents from api.zeroreader.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-01).

Runs chat completions against OpenAI's largest open-source 120B model via a pay-per-call API

Price / call$0.01

Seller volume →—

Success—

StatusUnknown

How this service works

GPT-OSS 120B (OpenAI) — OpenAI's largest open-source model.

Output

Returns an OpenAI-compatible chat.completion object containing the assistant's generated message, a finish_reason (e.g. 'stop'), a unique completion ID, and the choice index. The content field holds the full generated text response.

Example use cases

Example prompt

“Ask the 120B OpenAI open-source model to write a detailed technical explanation of how transformers work, keeping the response under 800 tokens and using a temperature of 0.5 for precision.”

Technical details

Endpoint

POSThttps://api.zeroreader.com/v1/ai/gpt-oss-120b?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need the highest-quality open-source model available on the ZeroReader platform (120B parameters), ideal for complex reasoning, nuanced generation, or tasks where model scale matters most. Prefer it over the 20B or smaller models when quality trumps cost or latency. Use instead of the DeepSeek R1 reasoning model when you need general-purpose generation rather than chain-of-thought math/logic.

Side effects

Payment not provided or invalid x402 payment header — returns 402 Payment Required
messages array missing or malformed role/content fields — returns 400 Bad Request
max_tokens exceeds 4096 limit — returns 400 validation error
temperature out of range 0-2 — returns 400 validation error
Model overloaded or unavailable — returns 503 Service Unavailable
Request timeout for very long completions — returns 504 Gateway Timeout

Input

Schema · Request body

Field	Type	Description
stream	boolean
messages	array
max_tokens	integer
temperature	number

Output

Schema · Response

{
  "id": "chatcmpl-example",
  "object": "chat.completion",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "I'm doing well!"
      },
      "finish_reason": "stop"
    }
  ]
}

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