GPT-5.1 Codex is a versatile code model with broad language support and strong performance across common development tasks. It provides reliable code generation, completion, and explanation capabilities for everyday software engineering.
Its balanced approach makes it suitable for general development work without the premium pricing of GPT-5.2 Codex.
Key Features
Broad programming language support
Reliable code completion and generation
128K token context for project understanding
Code explanation and documentation
Balanced cost and performance
Ideal Use Cases
General-purpose coding assistance
IDE-integrated code completion
Code documentation generation
Multi-language development support
Technical Specifications
| Context Window | 128K tokens |
| Modality | Text, Code → Text, Code |
| Provider | OpenAI |
| Category | Code Generation |
| Supported Languages | 35+ |
| Max Output | 16K tokens |
API Usage
1 curl -X POST https://api.vincony.com/v1/chat/completions \ 2 -H "Authorization: Bearer YOUR_API_KEY" \ 3 -H "Content-Type: application/json" \ 4 -d '{ 5 "model": "openai/gpt-5.1-codex", 6 "messages": [ 7 { "role": "user", "content": "Hello, GPT-5.1 Codex!" } 8 ] 9 }'
Replace YOUR_API_KEY with your Vincony API key. OpenAI-compatible endpoint — works with any OpenAI SDK.
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Frequently Asked Questions
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