o3 (Fast) API
About
Build advanced reasoning agents with o3 (Fast), a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $3.50/1M input and $14.00/1M output tokens, native tool calling support. Access o3 (Fast) via the Vercel AI Gateway API with up to 100K output tokens.
Capabilities
Input Modalities
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Output Modalities
text
Reasoning
Yes
Structured Output
Yes
Tool Use
Yes
WeightsClosed
Temperature
Fixed
Attachment
Supported
Limits
Context Window
200K
Tokens
Input Limit
100K
Tokens
Max Output
100K
Tokens
Pricing
Standard (per 1M tokens)
Input
$3.50
Output
$14.00
Caching (per 1M tokens)
Read
$0.88
Frequently Asked Questions
o3 (Fast) by Vercel AI Gateway costs $3.50 per 1M input tokens and $14.00 per 1M output tokens. Cached reads cost $0.88 per 1M tokens.
Model Details
ID
openai/o3-fast
Provider
Vercel AI GatewayFamily
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Release Date
Apr 16, 2025
Knowledge Cutoff
May 1, 2024
API Integration