# GPT-3.5 Turbo Instruct

> GPT-3.5 Turbo Instruct is a language model from OpenAI, released on 28 Sept 2023. It accepts text and generates text, with a 4K-token context window and up to 4K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $1.50 per million input tokens and $2 per million output tokens (OpenRouter), across 1 provider we track.

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

## Specifications

- **Developer:** OpenAI
- **Release date:** 28 Sept 2023 (source: OpenRouter, https://openrouter.ai/openai/gpt-3.5-turbo-instruct)
- **Status:** Generally available
- **Context window:** 4K (4,095 tokens) (source: OpenRouter, https://openrouter.ai/openai/gpt-3.5-turbo-instruct)
- **Max output:** 4K tokens (source: OpenRouter, https://openrouter.ai/openai/gpt-3.5-turbo-instruct)
- **Knowledge cutoff:** 30 Sept 2021 (source: OpenRouter, https://openrouter.ai/openai/gpt-3.5-turbo-instruct)
- **Input:** Text (source: OpenRouter, https://openrouter.ai/openai/gpt-3.5-turbo-instruct)
- **Output:** Text (source: OpenRouter, https://openrouter.ai/openai/gpt-3.5-turbo-instruct)
- **Reasoning mode:** No (source: OpenRouter, https://openrouter.ai/openai/gpt-3.5-turbo-instruct)
- **Tool calling:** No (source: OpenRouter, https://openrouter.ai/openai/gpt-3.5-turbo-instruct)
- **Structured output:** Yes (source: OpenRouter, https://openrouter.ai/openai/gpt-3.5-turbo-instruct)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| OpenRouter | $1.50 | $2 | – | 4K |

## FAQ

### What is the context window of GPT-3.5 Turbo Instruct?

GPT-3.5 Turbo Instruct has a context window of 4,095 tokens (4K) and can generate up to 3,685 tokens in a single response, according to OpenRouter.

### How much does the GPT-3.5 Turbo Instruct API cost?

GPT-3.5 Turbo Instruct is listed from $1.50 per million input tokens and $2 per million output tokens (OpenRouter). Prices last verified 4 Oct 2026.

### When was GPT-3.5 Turbo Instruct released?

OpenAI released GPT-3.5 Turbo Instruct on 28 Sept 2023, according to OpenRouter.

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