gpt-oss-20b

Name: gpt-oss-20b
Author: OpenAI

gpt-oss-20b is an open-weight 21B parameter model released by OpenAI under the Apache 2.0 license. It uses a Mixture-of-Experts (MoE) architecture with 3.6B active parameters per forward pass, optimiz

by OpenAI(0) 0 installs

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Free account. Installing gives you the manifest plus copy-paste snippets.

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About

Reference model card from the OpenRouter listing - model openai/gpt-oss-20b. Prices are per million tokens as listed; ratings and installs below are from this marketplace.

gpt-oss-20b

Facts


Vendor	OpenAI
Context window	131,072 tokens
Max output	117,964 tokens
Input price	$0.03 / 1M tokens
Output price	$0.13 / 1M tokens
Input	text
Output	text
Tool calling	yes
Structured outputs	yes
Reasoning	yes
Open weights	openai/gpt-oss-20b

Endpoint: https://openrouter.ai/api/v1 (OpenAI-compatible), model openai/gpt-oss-20b

Use it

Copy one of these into your project. Installing also returns the manifest and these snippets.

# after Install: the listing is in your workspace's routing pool - nothing else to configure
curl -s -X POST https://api.opensmartroute.ai/api/v1/route -H 'Authorization: Bearer $OSR_API_KEY' -H 'Content-Type: application/json' -d '{"text": "...", "plan": true}'
# or pin it on the OpenAI-compatible endpoint: {"model": "model-openai-gpt-oss-20b", ...}

Manifest

An Open Capability Manifest: the router reads it to know what this does, what it costs and when to pick it.

model-openai-gpt-oss-20b.ocm.jsonjson

{
  "ocm": "1",
  "id": "model-openai-gpt-oss-20b",
  "kind": "llm",
  "name": "gpt-oss-20b",
  "description": "gpt-oss-20b is an open-weight 21B parameter model released by OpenAI under the Apache 2.0 license. It uses a Mixture-of-Experts (MoE) architecture with 3.6B active parameters per forward pass, optimized for...",
  "publisher": "OpenAI",
  "version": "1.0.0",
  "capabilities": {
    "domains": [
      "general"
    ],
    "tags": [
      "llm",
      "openai",
      "openrouter",
      "open-weights",
      "reasoning",
      "tool-calling",
      "models"
    ],
    "languages": [
      "en"
    ],
    "modalities": [
      "text"
    ],
    "supports_tools": true,
    "supports_streaming": true,
    "context_window": 131072
  },
  "quality_prior": 0.09,
  "examples": [
    "gpt-oss-20b is an open-weight 21B parameter model released by OpenAI under the Apache 2.0 license. It uses a Mixture-of-Experts (MoE) architecture with 3.6B active parameters per forward pass, optimized for..."
  ],
  "primary": false,
  "metadata": {
    "source": {
      "provider": "models",
      "ref": "1754414229",
      "url": "https://openrouter.ai/openai/gpt-oss-20b",
      "key": "openai/gpt-oss-20b",
      "catalogue": "https://openrouter.ai/api/v1"
    },
    "model": "openai/gpt-oss-20b",
    "pricing": {
      "input_usd_per_1m": 0.03,
      "output_usd_per_1m": 0.13,
      "cache_read_usd_per_1m": 0.03
    },
    "max_output_tokens": 117964,
    "output_modalities": [
      "text"
    ],
    "hugging_face_id": "openai/gpt-oss-20b",
    "reasoning": true,
    "created": 1754414229,
    "benchmarks": {
      "intelligence_index": 9,
      "coding_index": 20.7,
      "agentic_index": 1.4,
      "hub_downloads": 6675065,
      "hub_downloads_total": 98061509,
      "hub_likes": 5070,
      "hub_trending": 27,
      "osr_index": 25.4,
      "osr_coverage": 0.4
    }
  },
  "cost": {
    "usd_per_1k_tokens": 0.00008
  },
  "endpoints": [
    {
      "protocol": "openai",
      "url": "https://openrouter.ai/api/v1"
    }
  ]
}

Fetch it by URL: GET /api/v1/registry/model-openai-gpt-oss-20b/manifest?version=1.0.0

About

gpt-oss-20b

Facts

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Manifest

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