All prices › OpenAI › GPT-3.5 Turbo 16K
GPT-3.5 Turbo 16K API pricing
As of October 16, 2026, GPT-3.5 Turbo 16K costs $3.00 per million input tokens and $4.00 per million output tokens on the OpenAI API. OpenAI plans to retire it on October 23, 2026.
Retires Oct 23
It is the 13th cheapest of 36 OpenAI models tracked here, by blended price. The closest Standard-tier model from another provider is Gemini 3.5 Flash (Google) at $1.50 / $9.00; GPT-3.5 Turbo 16K is 4% cheaper.
Input / 1M tokens$3.00
Output / 1M tokens$4.00
Context window16K
Max output4K
Every published rate
| Rate | Per 1M tokens |
|---|---|
| Input (standard) | $3.00 |
| Output (standard) | $4.00 |
What it costs in practice
| Task | Tokens | Per request | Per 1,000 requests |
|---|---|---|---|
| Chatbot reply | 1,000 in / 500 out | $0.005 | $5.00 |
| Summarize a long document | 20,000 in / 1,000 out | $0.06 | $64.00 |
| Coding agent step | 50,000 in / 2,000 out | $0.16 | $158 |
Standard rates, no caching or batch discount. Compare your own numbers across all models →
Price history
| Date | Model | Change |
|---|---|---|
| 2024-01-09 | GPT-3.5 Turbo 16K | Context window: – → 16K source |
Dates are when each change first appeared in the LiteLLM price data, usually within days of the provider's announcement.
Details
| Provider | OpenAI |
| Price tier | Standard |
| Features | Prompt caching |
| API model names | gpt-3.5-turbo-16k |
| Retirement date | October 23, 2026 |
| Official pricing | openai.com |
Models at a similar price
| Model | Input / 1M | Output / 1M |
|---|---|---|
| Gemini 3.5 Flash | $1.50 | $9.00 |
| Gemini Omni 1.1 Flash | $1.50 | $9.00 |
| Gemini 2.5 Pro | $1.25 | $10.00 |
| GPT-5 | $1.25 | $10.00 |
| GPT-5.1 | $1.25 | $10.00 |
| GPT-5 Search API | $1.25 | $10.00 |
Other OpenAI models
| Model | Input / 1M | Output / 1M |
|---|---|---|
| GPT-4 | $30.00 | $60.00 |
| GPT-5.6 Cyber | $12.50 | $75.00 |
| GPT-5.5 Cyber | $12.50 | $75.00 |
| o1 | $15.00 | $60.00 |
| GPT-6 Astra | $10.00 | $50.00 |
| GPT-4 Preview | $10.00 | $30.00 |
| GPT-4 Turbo | $10.00 | $30.00 |
| GPT-5.5 | $5.00 | $30.00 |
| GPT-Rosalind Research | $5.00 | $25.00 |
| GPT-Rosalind Discovery | $5.00 | $25.00 |
| GPT-5.6 | $4.00 | $20.00 |
| GPT-5.6 Sol | $4.00 | $20.00 |
| GPT-5.4 | $2.50 | $15.00 |
| GPT-5.2 | $1.75 | $14.00 |
| GPT-5.6 Terra | $2.00 | $12.00 |
| GPT-4o | $2.50 | $10.00 |
| GPT-6 Sol | $2.00 | $10.00 |
| GPT-6.1 Sol | $2.00 | $10.00 |
| GPT-4.1 | $2.00 | $8.00 |
| o3 | $2.00 | $8.00 |
| GPT-5 | $1.25 | $10.00 |
| GPT-5.1 | $1.25 | $10.00 |
| GPT-5 Search API | $1.25 | $10.00 |
| o3 Mini | $1.10 | $4.40 |
| o4 Mini | $1.10 | $4.40 |
| GPT-5.4 Mini | $0.75 | $4.50 |
| GPT-3.5 Turbo | $0.50 | $1.50 |
| GPT-4.1 Mini | $0.40 | $1.60 |
| GPT-5 Mini | $0.25 | $2.00 |
| GPT-5.4 Nano | $0.20 | $1.25 |
| GPT-5.6 Luna | $0.20 | $1.20 |
| GPT-4o Mini | $0.15 | $0.60 |
| GPT-6 Luna | $0.10 | $0.50 |
| GPT-4.1 Nano | $0.10 | $0.40 |
| GPT-5 Nano | $0.05 | $0.40 |