AI Model Atlas / OpenAI
GPT-3.5 Turbo 16k
One million input tokens cost $3.00 and one million output tokens $4.00. Context window: 16k tokens, about 27 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 | $0.01 |
| 100 chat queries700 tokens per question and 400 per answer | 70,000 tokens | 40,000 tokens | $0.37 |
| Hour of work with an agentagent reads repository and writes fixes | 250,000 tokens | 30,000 tokens | $0.87 |
Technical details
| Provider | OpenAI |
| Modalities | text → text |
| Context window | 16k tokens (~27 A4 pages) |
| Maximum response | 4k tokens |
| Step-by-step reasoning | no |
| Tool calling | yes |
| Forced JSON format | yes |
| Knowledge cutoff | 2021-09-30 |
| Cache read | no data |
| Content moderation | no extra filter |
How it compares to the rest
The database contains 469 models. In terms of input pricing GPT-3.5 Turbo 16k is more expensive than 88 percent of paid models. A longer context window is available in 456 models.
Input price history
2026-09-08 · $3.002026-11-11 · $3.00
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 |
|---|---|---|---|---|
| Grok 4.7 (batch)xAI | $1.60 | $4.80 | $0.01 | 500k |
| Grok 4.6 (batch)xAI | $1.60 | $4.80 | $0.01 | 500k |
| Gemini 4 Carbon (batch)Google | $1.00 | $5.00 | $0.01 | 1M |
| Gemini 4 Argon (batch)Google | $1.00 | $5.00 | $0.01 | 1M |
Compare GPT-3.5 Turbo 16k with another model or go back to the full database 469 models.