Codex 5.1
Codex 5.1 is OpenAI's language model. An OpenAI Codex model in the fifth-generation series, version 5.1, designed for code generation and software engineering tasks.
Capabilities
Input1/5
Text✓
Image·
Audio·
Video·
PDF·
Output1/5
Text✓
Image·
Audio·
Video·
Embedding·
Capabilities0/13
Reasoning·
Adaptive Reasoning·
Function Calling·
Parallel Function Calling·
Structured Outputs·
Native JSON Schema·
Web Search·
URL Context·
Computer Use·
Code Execution·
File Search·
Prompt Caching·
Assistant Prefill·
Pricing by Provider
| Provider | Standard | |
|---|---|---|
| Input $ / 1M | Cache Read $ / 1M | |
 Azure AI Foundry | $1.25 | $0.125 |
Cost Calculator
Preset:
Versions
| Version | Released | Context | Input / 1M | Output / 1M | Status |
|---|---|---|---|---|---|
| Codex 5.1 | — | — | — | — | Current |
| Codex 5.1 Max | — | — | — | — | Available |
| Codex 5.1 Mini | — | — | — | — | Available |
| Codex 5.2 | — | — | — | — | Available |
| Codex 5.3 | — | — | — | — | Available |
| Codex Mini | — | 200K | $1.50 | $6.00 | Available |