Inferbase
Beta
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.
Input
Output
Context
400K
Max Output
128K
Parameters
—
Technical Specifications
Model TypeChat
Context Window400K
Max Output Tokens128K
Parameters—
Training Cutoff—
License—
Capabilities
Input Modalities
textimage
Output Modalities
text
Features
visionfunction_callingstreamingjson_modecode_generationtool_useagenticextended_thinking
Benchmarks
Pricing
per 1M tokens • updated regularlyAvailable on 1 Platform
| Platform | Input | Output |
|---|---|---|
OpenRouter | $1.25 | $10.00 |
Related Tools
Data sourced from official provider APIs and documentation
Last updated: Mar 16, 2026
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