Openai
OpenAI: GPT-5.1-Codex-Max
Symphony
REGULAR
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.
Input Price
25 credits/M
per million tokens
Output Price
200 credits/M
per million tokens
Context Window
400,000
tokens
Capabilities
Input
TEXT-AND-IMAGE
Output
TEXT