gpt-5.1-codex-max
by OpenAI
· GPT 5.1 family · released Sep 17, 2025
Closed
Active
Codex CLI engine for long autonomous coding runs.
Pricing
Launch price (from Sep 17, 2025)
$5.00 in / $25.00 out per 1M tokens
Current price (since Sep 17, 2025)
$5.00 in / $25.00 out per 1M tokens
Cache read: $0.500/M
| Tier | Effective | In $/M | Out $/M | Cache $/M | Per image | Per second | Source |
|---|---|---|---|---|---|---|---|
| Standard | Sep 17, 2025 – now | $5.00 | $25.00 | $0.500 | - | - | - |
Specifications
| Model type | Text LLM |
|---|---|
| Architecture | MoE |
| Parameters | Not disclosed |
| Context window | 400K tokens |
| Max output | 128K tokens |
| Knowledge cutoff | Jul 1, 2025 |
| License | Proprietary |
| Modalities | Text input Image input Text output |
| Tags | Agentic Coding |
| End of life | Not disclosed |
| Last verified | Aug 20, 2026 |