GPT OSS 20B API
About
Build advanced reasoning agents with 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, native tool calling support, open weights architecture. Access GPT OSS 20B via the Cloudflare AI Gateway API with up to 16K output tokens.
Capabilities
Input Modalities
text
Output Modalities
text
Reasoning
Yes
Structured Output
Yes
Tool Use
Yes
WeightsOpen
Limits
Context Window
128K
Tokens
Input Limit
128K
Tokens
Max Output
16K
Tokens
Pricing
Standard (per 1M tokens)
Input
$0.20
Output
$0.30
Frequently Asked Questions
GPT OSS 20B by Cloudflare AI Gateway costs $0.20 per 1M input tokens and $0.30 per 1M output tokens.
Model Details
ID
workers-ai/@cf/openai/gpt-oss-20b
Provider
Cloudflare AI GatewayFamily
gpt-oss
Release Date
Aug 5, 2025
Knowledge Cutoff
N/A
API Integration
NPM Package
ai-gateway-provider
Environment Variables
CLOUDFLARE_API_TOKEN
CLOUDFLARE_ACCOUNT_ID
CLOUDFLARE_GATEWAY_ID
API Base URL
https://gateway.ai.cloudflare.com/v1/${CLOUDFLARE_ACCOUNT_ID}/${CLOUDFLARE_GATEWAY_ID}/compat/