GPT-3.5 Turbo 16k
Summary
GPT-3.5 Turbo 16k is a language model from OpenAI, released on 28 Aug 2023. It accepts text and generates text, with a 16K-token context window and up to 4K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $3 per million input tokens and $4 per million output tokens (OpenRouter), across 1 provider we track.
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...
Last verified 4 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | OpenAI |
|---|---|
| Release date | 28 Aug 2023 [OpenRouter] |
| Status | Generally available |
| Context window | 16K (16,385 tokens) [OpenRouter] |
| Max output | 4K tokens [OpenRouter] |
| Knowledge cutoff | 30 Sept 2021 [OpenRouter] |
| Input | Text [OpenRouter] |
| Output | Text [OpenRouter] |
| Reasoning mode | No [OpenRouter] |
| Tool calling | Yes [OpenRouter] |
| Structured output | Yes [OpenRouter] |
GPT-3.5 Turbo 16k API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| OpenRouter openai/gpt-3.5-turbo-16k | $3 | $4 | – | 16K | OpenRouter, 4 Oct 2026 |
Frequently asked questions
What is the context window of GPT-3.5 Turbo 16k?
GPT-3.5 Turbo 16k has a context window of 16,385 tokens (16K) and can generate up to 4,096 tokens in a single response, according to OpenRouter.
How much does the GPT-3.5 Turbo 16k API cost?
GPT-3.5 Turbo 16k is listed from $3 per million input tokens and $4 per million output tokens (OpenRouter). Prices last verified 4 Oct 2026.
When was GPT-3.5 Turbo 16k released?
OpenAI released GPT-3.5 Turbo 16k on 28 Aug 2023, according to OpenRouter.
Change history
No changes detected since we started tracking this model. We re-check every source daily.