OpenAI

GPT-5.1 Codex Max

Coding-optimized GPT model for repository edits, reviews, and agentic software work

openai/gpt-5.1-codex-max

Context

400K

Output

128K

Released

2025-11-13

Knowledge cutoff

2024-09-30

Types

InputTextImage

OutputText

Reasoning

Supported

Tool use

Supported

Structured output

Supported

Attachments

Supported

Open weights

—

Provider pricing

Poe

InTextImage

OutText

Price: $1.10 / $9.00
Context: 400K
Status: Stable

Kilo Gateway

InTextImagePDF

OutText

Price: $1.25 / $10.00
Context: 400K
Status: Stable

Ofox

InTextImage

OutText

Price: $1.25 / $10.00
Context: 256K
Status: Stable

OpenRouter

InTextImage

OutText

Price: $1.25 / $10.00
Context: 400K
Status: Stable

Vercel AI Gateway

InTextImagePDF

OutText

Price: $1.25 / $10.00
Context: 400K
Status: Stable

NanoGPT

InTextImagePDF

OutText

Price: $2.50 / $20.00
Context: 400K
Status: Stable

AI/ML API

InTextImage

OutText

Price: $3.44 / $27.51
Context: 400K
Status: Stable

Provider	Types	Price	Context	Status
Poe	InTextImage OutText	$1.10 / $9.00	400K	Stable
Kilo Gateway	InTextImagePDF OutText	$1.25 / $10.00	400K	Stable
Ofox	InTextImage OutText	$1.25 / $10.00	256K	Stable
OpenRouter	InTextImage OutText	$1.25 / $10.00	400K	Stable
Vercel AI Gateway	InTextImagePDF OutText	$1.25 / $10.00	400K	Stable
NanoGPT	InTextImagePDF OutText	$2.50 / $20.00	400K	Stable
AI/ML API	InTextImage OutText	$3.44 / $27.51	400K	Stable

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