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Helicone

OpenAI: GPT-5.1 Codex API

Helicone
About

Integrate multimodal vision capabilities using OpenAI: GPT-5.1 Codex, designed to process both text and images seamlessly. This model delivers cost-effective pricing at $1.25/1M input and $10.00/1M output tokens, native tool calling support. Access OpenAI: GPT-5.1 Codex via the Helicone API with up to 128K output tokens.

Capabilities

Input Modalities

textimage

Output Modalities

textimage
Reasoning
No
Structured Output
No
Tool Use
Yes
WeightsClosed
Temperature
Fixed
Attachment
Not Supported
Limits
Context Window
400K

Tokens

Input Limit
400K

Tokens

Max Output
128K

Tokens

Pricing

Standard (per 1M tokens)

Input
$1.25
Output
$10.00

Caching (per 1M tokens)

Read
$0.13
Frequently Asked Questions

OpenAI: GPT-5.1 Codex by Helicone costs $1.25 per 1M input tokens and $10.00 per 1M output tokens. Cached reads cost $0.13 per 1M tokens.

Model Details
ID
gpt-5.1-codex
Provider
Helicone
Family
gpt-codex
Release Date
Jan 1, 2025
Knowledge Cutoff
Jan 1, 2025
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
HELICONE_API_KEY
API Base URL
https://ai-gateway.helicone.ai/v1
Documentation