Using gpt-oss-20b on Cloudflare Workers AI

Implementation guide · GPT-OSS · OpenAI

ServerlessOpen Source

Cloudflare Workers AI exposes gpt-oss-20b through model ID @cf/openai/gpt-oss-20b. Use the setup steps, sourced pricing, capabilities, and official provider links below to validate this route before deployment.

Last refreshed 2026-04-24. Next refresh: weekly.

Quick Start

1
Create an account at Cloudflare Workers AI and generate an API key.
2
Use the Cloudflare Workers AI SDK or REST API to call @cf/openai/gpt-oss-20b — see the documentation for request format.
3
You'll be billed $0.20/1M input, $0.30/1M output tokens. See full pricing.

API Portal Documentation Pricing Model Card

Code Examples

See Cloudflare Workers AI documentation for integration details.

Pricing on Cloudflare Workers AI

Type	Price (per 1M)
Input tokens	$0.20
Output tokens	$0.30

Capabilities

JSON / Tool useStructured Outputs

About gpt-oss-20b

OpenAI open-weight model with 20 billion parameters. Lightweight, efficient text-only model with reasoning and function calling. Free for self-hosting. Released August 5, 2025.

Full model details →

Model Specs

Released2025-08-05

Parameters20B

Context131k

ArchitectureDecoder Only

Knowledge cutoff2025-08

Cloudflare

San Francisco, California, United States