AI Model Atlas / OpenAI
GPT-5.1-Codex-Mini
One million input tokens cost $0.25 and one million output tokens $2.00. Context window: 400k tokens, about 667 A4 pages.
What it costs in practice
Pricing per million tokens doesn't mean anything to anyone, so I convert it to three tasks that people actually give to models. The usage assumptions are listed for each row so you can verify them.
| Task | Input | Output | Cost |
|---|---|---|---|
| 1500-word articlebrief plus finished text in English | 1,500 tokens | 2,200 tokens | $0.0048 |
| 100 chat queries700 tokens per question and 400 per answer | 70,000 tokens | 40,000 tokens | $0.10 |
| Hour of work with an agentagent reads repository and writes fixes | 250,000 tokens | 30,000 tokens | $0.12 |
Technical details
| Provider | OpenAI |
| Modalities | image + text → text |
| Context window | 400k tokens (~667 A4 pages) |
| Maximum response | 128k tokens |
| Step-by-step reasoning | yes |
| Tool calling | yes |
| Forced JSON format | yes |
| Knowledge cutoff | not specified |
| Cache read | $0.030 per million |
| Content moderation | no extra filter |
How it compares to the rest
The database contains 469 models. In terms of input pricing GPT-5.1-Codex-Mini is more expensive than 34 percent of paid models. A longer context window is available in 223 models.
Input price history
2026-09-08 · $0.252026-11-11 · $0.25
The chart shows the price of a million input tokens on consecutive measurement days. History starts on the day I launched the atlas and grows with each day. I don't backfill data.
Alternatives at a similar price
Models from other providers whose cost for the same article comes out closest.
| Model | Input / M | Output / M | 1500-word article | Context |
|---|---|---|---|---|
| Seed-2.0-LiteBytedance seed | $0.25 | $2.00 | $0.0048 | 262k |
| Seed 1.6Bytedance seed | $0.25 | $2.00 | $0.0048 | 262k |
| Qwen3.6 PlusQwen (Alibaba) | $0.33 | $1.95 | $0.0048 | 1M |
| Aion-2.0AionLabs | $0.80 | $1.60 | $0.0047 | 131k |
Compare GPT-5.1-Codex-Mini with another model or go back to the full database 469 models.