# Agent Hub – GPT-OSS-120B Chat Completions (OpenAI-Compatible)

> Agent Hub – GPT-OSS-120B Chat Completions (OpenAI-Compatible) is a paid API for AI agents from agents.torbrooknews.com, paid per call via x402, $0.006/call, status unknown (last checked 2026-10-13).

Runs OpenAI-compatible chat completions on GPT-OSS-120B, a large open-weight reasoning model with tool calling and streaming, billed per-request via x402 micropayments.

## Facts

- Endpoint: GET https://agents.torbrooknews.com/v1/gpt-oss/chat/completions?utm_source=zero.xyz
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-hub-gpt-oss-120b-chat-completions-openai-compatible-a5074e84
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gU6-M3OFQakH-fzWPr68x

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 agent-hub-gpt-oss-120b-chat-completions-openai-compatible-a5074e84
```

Example prompt: Using the 120B reasoning model, figure out the best multi-step strategy for migrating a monolithic Node.js app to microservices — think through the trade-offs carefully and call any tools you need.

## When to prefer this

Choose this endpoint when you need the largest, most capable open-weight OpenAI model (120B) with full tool-calling and reasoning support, especially when you want OpenAI SDK compatibility without an OpenAI API key, or when per-request micropayment billing via x402 is preferred over a subscription. Prefer this over the 20B sibling when task complexity demands deeper reasoning or more nuanced multi-step outputs.

## Known failure modes

- Prompt missing or empty — 400 bad request
- Payment not provided or x402 handshake fails — 402 Payment Required
- Model overloaded or unavailable — 503 Service Unavailable
- Output truncated at 4096 token limit if prompt+completion exceeds context
- Invalid temperature or max_tokens value — 422 Unprocessable Entity
- Streaming connection dropped mid-response

## How this service works

OpenAI-compatible chat completions on OpenAI gpt-oss-120b, the strongest open-weight OpenAI model, reasoning with tool calling. Set your OpenAI SDK base URL to https://agents.torbrooknews.com/v1/gpt-oss and pay $0.006 per request with x402 instead of an API key. Same request/response shape as OpenAI (tool calling, reasoning, streaming supported), up to 4096 output tokens. Also callable as GET with the same fields as query parameters.

## Output

Returns an OpenAI-compatible chat completion object containing an assistant message, optional tool calls, and reasoning traces. Supports streaming responses. Output is capped at 4096 tokens per request.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "prompt"
     ],
     "properties": {
      "prompt": {
       "type": "string",
       "description": "User message"
      },
      "system": {
       "type": "string",
       "description": "Optional system message"
      },
      "max_tokens": {
       "type": "integer"
      },
      "temperature": {
       "type": "number"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-hub-gpt-oss-120b-chat-completions-openai-compatible-a5074e84/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agents.torbrooknews.com](https://www.zero.xyz/host/agents.torbrooknews.com/llms.txt)