GPT-3.5 Turbo 16k
by OpenAI · openai/gpt-3.5-turbo-16k · #243 cheapest of 325 paid models
Prices updated Jul 22, 2026, 1:37 AM UTC · refreshed hourly
This model offers four times the context length of gpt-3.5-turbo, allowing it to support approximately 20 pages of text in a single request at a higher cost. Training data: up...
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Pricing
Input
$3.00
per 1M tokens
Output
$4.00
per 1M tokens
Blended (3:1)
$3.25
3 input : 1 output
Cache read
—
per 1M cached tokens
Cache write
—
per 1M tokens
Cache & batch economics
Effective prices for GPT-3.5 Turbo 16k (no cache-read rate published — hits billed as normal input).
| Cache hit rate | Effective blended $/1M | Example request* | vs no cache |
|---|---|---|---|
| 0% | $3.25 | $0.31 | — |
| 50% | $3.25 | $0.31 | −0% |
| 90% | $3.25 | $0.31 | −0% |
*Example: 100K sticky context + 2K new input + 1K output. Batch discount is an approximate 50% off list rates for this provider’s batch API. Confirm on the vendor’s pricing page.
What a request costs
| Workload | Input tokens | Output tokens | Cost / request | Cost / 1K requests |
|---|---|---|---|---|
| Short chat message | 500 | 300 | $0.0027 | $2.70 |
| Document summary | 8,000 | 1,000 | $0.028 | $28.00 |
| Codebase question (RAG) | 30,000 | 2,000 | $0.098 | $98.00 |
| Long-context analysis | 150,000 | 5,000 | $0.47 | $470.00 |
Specs
Context window
16K
tokens
Max output
4K
tokens
Input modalities
text
Tokenizer
GPT