# GPT-3.5 Turbo 16k

> 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.

Source page: https://www.aimodel.directory/models/gpt-3-5-turbo-16k
Last verified: 4 Oct 2026

## Specifications

- **Developer:** OpenAI
- **Release date:** 28 Aug 2023 (source: OpenRouter, https://openrouter.ai/openai/gpt-3.5-turbo-16k)
- **Status:** Generally available
- **Context window:** 16K (16,385 tokens) (source: OpenRouter, https://openrouter.ai/openai/gpt-3.5-turbo-16k)
- **Max output:** 4K tokens (source: OpenRouter, https://openrouter.ai/openai/gpt-3.5-turbo-16k)
- **Knowledge cutoff:** 30 Sept 2021 (source: OpenRouter, https://openrouter.ai/openai/gpt-3.5-turbo-16k)
- **Input:** Text (source: OpenRouter, https://openrouter.ai/openai/gpt-3.5-turbo-16k)
- **Output:** Text (source: OpenRouter, https://openrouter.ai/openai/gpt-3.5-turbo-16k)
- **Reasoning mode:** No (source: OpenRouter, https://openrouter.ai/openai/gpt-3.5-turbo-16k)
- **Tool calling:** Yes (source: OpenRouter, https://openrouter.ai/openai/gpt-3.5-turbo-16k)
- **Structured output:** Yes (source: OpenRouter, https://openrouter.ai/openai/gpt-3.5-turbo-16k)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| OpenRouter | $3 | $4 | – | 16K |

## FAQ

### 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.

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Data licensed CC BY 4.0. Cite as: AI Model Directory, "GPT-3.5 Turbo 16k", https://www.aimodel.directory/models/gpt-3-5-turbo-16k