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OpenAI: GPT-5.1-Codex-Max

New in 2026

Developed by openai

API Pricing (per 1M tokens)

Input$1.25
Output$10.00

Intelligence Benchmarks

MMLU ProN/A
GPQAN/A
Intelligence IndexN/A
LivebenchN/A

Technical Specifications

Context Window400K Tokens
Vision SupportYes
Tokens per SecondN/A
Time to First Token (s)N/A
Modalities
textimage->text

About OpenAI: GPT-5.1-Codex-Max

GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasoning stack and trained on agentic workflows spanning software engineering, mathematics, and research. GPT-5.1-Codex-Max delivers faster performance, improved reasoning, and higher token efficiency across the development lifecycle.