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Vercel AI Gateway

GPT 5.3 Codex API

Vercel AI Gateway
About

Build advanced reasoning agents with GPT 5.3 Codex, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $1.75/1M input and $14.00/1M output tokens, native tool calling support. Access GPT 5.3 Codex via the Vercel AI Gateway API with up to 128K output tokens.

Capabilities

Input Modalities

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Output Modalities

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Reasoning
Yes
Structured Output
No
Tool Use
Yes
WeightsClosed
Temperature
Adjustable
Attachment
Supported
Limits
Context Window
400K

Tokens

Input Limit
272K

Tokens

Max Output
128K

Tokens

Pricing

Standard (per 1M tokens)

Input
$1.75
Output
$14.00

Caching (per 1M tokens)

Read
$0.17
Frequently Asked Questions

GPT 5.3 Codex by Vercel AI Gateway costs $1.75 per 1M input tokens and $14.00 per 1M output tokens. Cached reads cost $0.17 per 1M tokens.

Model Details
ID
openai/gpt-5.3-codex
Provider
Vercel AI Gateway
Family
gpt
Release Date
Feb 24, 2026
Knowledge Cutoff
N/A
API Integration
NPM Package
@ai-sdk/gateway
Environment Variables
AI_GATEWAY_API_KEY
Documentation