GPT-5.1
by OpenAI
· GPT 5 family · released Nov 12, 2025
Closed
Active
OpenAI's GPT-5.1 update shipped three weeks ahead of schedule to all ChatGPT users, including free tier, with a warmer default personality and reduced sycophancy. API pricing matches GPT-5 with a unified reasoning/endpoint model.
Pricing
Launch price (from Nov 12, 2025)
$1.25 in / $10.00 out per 1M tokens
Current price (since Nov 12, 2025)
$1.25 in / $10.00 out per 1M tokens
| Tier | Effective | In $/M | Out $/M | Cache $/M | Per image | Per second | Source |
|---|---|---|---|---|---|---|---|
| Standard | Nov 12, 2025 – now | $1.25 | $10.00 | - | - | - | - |
Specifications
| Model type | Multimodal |
|---|---|
| Architecture | Unknown |
| Parameters | Not disclosed |
| Context window | 400K tokens |
| Max output | 128K tokens |
| Knowledge cutoff | Not disclosed |
| License | Proprietary |
| Modalities | Text input Image input Text output |
| Tags | Agentic Coding Flagship Reasoning Tool use |
| End of life | Not disclosed |
| Last verified | Not disclosed |