Coding-optimized GPT model for repository edits, reviews, and agentic software work
Details
| Field | Value |
|---|---|
| id | openai/gpt-5.1-codex-max |
| family | gpt-codex |
| modality | text+image+pdf->text |
| context_length | 400000 |
| max_input_tokens | 272000 |
| max_output_tokens | 128000 |
| knowledge_cutoff | 2024-09-30 |
| release_date | 2025-11-13 |
| is_open_weights | no |
| supports_tool_call | yes |
| supports_reasoning | yes |
| supports_structured_output | yes |
| supports_attachment | yes |
| input_modalities | text, image, pdf |
| output_modalities | text |