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Cloudflare Workers AI

@cf/openai/gpt-oss-20b API

Cloudflare Workers AI
About

Build advanced reasoning agents with @cf/openai/gpt-oss-20b, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $0.20/1M input and $0.30/1M output tokens, open weights architecture. Access @cf/openai/gpt-oss-20b via the Cloudflare Workers AI API with up to 128K output tokens.

Capabilities

Input Modalities

text

Output Modalities

text
Reasoning
Yes
Structured Output
No
Tool Use
No
WeightsOpen
Temperature
Fixed
Attachment
Not Supported
Limits
Context Window
128K

Tokens

Input Limit
128K

Tokens

Max Output
128K

Tokens

Pricing

Standard (per 1M tokens)

Input
$0.20
Output
$0.30
Frequently Asked Questions

@cf/openai/gpt-oss-20b by Cloudflare Workers AI costs $0.20 per 1M input tokens and $0.30 per 1M output tokens.

Model Details
ID
gpt-oss-20b
Provider
Cloudflare Workers AI
Family
gpt-oss
Release Date
Aug 4, 2025
Knowledge Cutoff
N/A
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
CLOUDFLARE_ACCOUNT_ID
CLOUDFLARE_API_KEY
API Base URL
https://api.cloudflare.com/client/v4/accounts/${CLOUDFLARE_ACCOUNT_ID}/ai/v1
Documentation