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FastRouter

GPT OSS 20B API

FastRouter
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 $0.05/1M input and $0.20/1M output tokens, native tool calling support, open weights architecture. Access GPT OSS 20B via the FastRouter API with up to 66K output tokens.

Capabilities

Input Modalities

text

Output Modalities

text
Reasoning
Yes
Structured Output
No
Tool Use
Yes
WeightsOpen
Temperature
Adjustable
Attachment
Not Supported
Limits
Context Window
131K

Tokens

Input Limit
131K

Tokens

Max Output
66K

Tokens

Pricing

Standard (per 1M tokens)

Input
$0.05
Output
$0.20
Frequently Asked Questions

GPT OSS 20B by FastRouter costs $0.05 per 1M input tokens and $0.20 per 1M output tokens.

Model Details
ID
openai/gpt-oss-20b
Provider
FastRouter
Family
gpt-oss
Release Date
Aug 5, 2025
Knowledge Cutoff
N/A
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
FASTROUTER_API_KEY
API Base URL
https://go.fastrouter.ai/api/v1
Documentation