GPT-5.1 Codex mini API
About
Build advanced reasoning agents with GPT-5.1 Codex mini, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $0.25/1M input and $2.00/1M output tokens, native tool calling support. Access GPT-5.1 Codex mini via the Ofox API with up to 66K output tokens.
Capabilities
Input Modalities
textimage
Output Modalities
text
Reasoning
Yes
Structured Output
Yes
Tool Use
Yes
WeightsClosed
Temperature
Fixed
Attachment
Supported
Limits
Context Window
256K
Tokens
Input Limit
256K
Tokens
Max Output
66K
Tokens
Pricing
Standard (per 1M tokens)
Input
$0.25
Output
$2.00
Caching (per 1M tokens)
Read
$0.03
Frequently Asked Questions
GPT-5.1 Codex mini by Ofox costs $0.25 per 1M input tokens and $2.00 per 1M output tokens. Cached reads cost $0.03 per 1M tokens.
Model Details
ID
openai/gpt-5.1-codex-mini
Provider
OfoxFamily
gpt-codex
Release Date
Nov 13, 2025
Knowledge Cutoff
Sep 30, 2024
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
OFOX_API_KEY
API Base URL
https://api.ofox.ai/v1