GPT-3.5 Turbo Instruct

This model is a variant of GPT-3.5 Turbo tuned for instructional prompts and omitting chat-related optimizations.

Model by OpenAI

IndexedProprietary

Install

Pick your client. Read the repository before you give any tool access to your data.

{
  "model": "openai/gpt-3.5-turbo-instruct",
  "baseURL": "https://openrouter.ai/api/v1"
}

OpenAI-compatible API: point any OpenAI SDK at the base URL and use this model id.

Settings it needs

OPENROUTER_API_KEYrequiredsecret

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About

This model is a variant of GPT-3.5 Turbo tuned for instructional prompts and omitting chat-related optimizations. Training data: up to Sep 2021.

Use cases: model-inference

Reviews

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Price and limits

Variant	Input $/M tokens	Output $/M tokens	Cached input $/M
Standard	$1.5	$2	—

Price as of Oct 24, 2026 from OpenRouter · provider's own prices: openai.com. Prices change often; check before you rely on one.

Provider: OpenAI
Model id: openai/gpt-3.5-turbo-instruct
Context window: 4,095 tokens (4K)
Max output: 3,685 tokens
Input: text
Output: text
Tool calling: Not listed
Structured outputs: Yes
Reasoning: No
Weights: Closed
Released: Sep 28, 2023
Knowledge cutoff: 2021-09-30

Details

Auth: API key
License: Proprietary
Website: openai.com
Docs: openrouter.ai/openai/gpt-3.5-turbo-instruct/api
First seen: Oct 24, 2026
Last checked: Oct 24, 2026
Source: OpenRouter

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Cite this page

GPT-3.5 Turbo Instruct: price, context window, tool use. Agent Mart. https://agentmart.dev/models/openai-gpt-3-5-turbo-instruct (last updated 2026-10-24)