How much does GPT-3.5 Turbo cost per million tokens?

GPT-3.5 Turbo costs $0.5 per million input tokens and $1.50 per million output tokens at list price.

What is the context window of GPT-3.5 Turbo?

GPT-3.5 Turbo accepts up to 16,385 tokens of context and returns up to 4,096 output tokens.

How much do 1,000 chat messages cost with GPT-3.5 Turbo?

About $1.25, assuming 1,000 input + 500 output tokens per message.

Is there a cheaper alternative to GPT-3.5 Turbo?

In the same price range, Qwen Qwen3.8 Omni Flash ($0.15 / $0.47), Z.ai GLM 5.3 FlashX ($0.37 / $1.25), DeepSeek DeepSeek V4.1 Flash ($0.03 / $0.5) cost less per token. Quality differs: test on your own prompts.

Where can I buy OpenAI API credits for less?

Discount credit books resell OpenRouter usage below face value within their depth, OpenRouter adds a 5.5% card fee, and OpenAI sells its own credits at face value. The live table on this page ranks them for $100 of usage.

OpenAI · live price

GPT-3.5 Turbo API pricing

GPT-3.5 Turbo is OpenAI's fastest model. It can understand and generate natural language or code, and is optimized for chat and traditional completion tasks. Training data up to Sep 2021.

Small and cheap (under $1 per 1M)Tool calling

Input: $0.5; per 1M tokens
Output: $1.50; per 1M tokens
Cached input: –; per 1M tokens
Context: 16K; 4K max output

List price from OpenRouter, which passes OpenAI's price through without markup. Refreshed hourly. Released May 28, 2023. Model id openai/gpt-3.5-turbo.

What GPT-3.5 Turbo costs in practice

At list price, before any batch or caching discount.

1,000 chat messages

$1.25

1,000 input + 500 output tokens each

1,000 RAG questions

$4.75

8,000 input + 500 output tokens each

100 coding-agent steps

$1.80

30,000 input + 2,000 output tokens each, no caching

GPT-3.5 Turbo price history

No price change since we started tracking on 2026-10-01. We record prices daily; changes will show here.

GPT-3.5 Turbo price by host

One host serves this model through OpenRouter.

OpenAI$0.5 in · $1.50 out · 16K ctx · 100.0% uptime 24h

Where to buy OpenAI credits for less

GPT-3.5 Turbo costs the same per token everywhere it's sold through OpenRouter. What changes is the price of the credits. Live quotes for $100 of usage:

#	Where you buy	You payYou pay for $100.00 of usage	vs list price	Price source
1	OrbioCardCheapest right now Credits from a discount book, plus a 5% platform fee and card processing, both included in the quote.	$85.10 incl. $2.60 card processing	-14.9%	live quote
2	smaaartCard Credits from a discount book, plus a 5% platform fee on face value. Card processing and taxes shown at checkout.	$95.00 + card processing and tax at checkout (not in this number)	-5.0%	live quote
3	Direct from the labCard Prepaid credits at face value (OpenAI, Anthropic, Google…). Taxes may apply.	$100.00 no top-up fee	list price	face value
4	OpenRouterCrypto 5% on crypto purchases. No markup on model prices.	$105.00 fees included	+5.0%	published fee
5	OpenRouterCard 5.5% on card purchases, $0.80 minimum. No markup on model prices.	$105.50 fees included	+5.5%	published fee

Disclosure: this site is run by the team behind smaaart, one of the options compared. Tables are ranked by price only, from live quotes and published fees, including when smaaart isn't first. How we compare

GPT-3.5 Turbo cost calculator

Enter your monthly tokens to price your own usage.

Model$0.5 in / $1.50 out per 1M tokens · list price, liveInput tokens / month (millions)Output tokens / month (millions)

Usage at list price$40.00/ month

Cheaper alternatives to GPT-3.5 Turbo

Other labs' models in the same price range or the one below, cheaper per token.

Model	Input / 1M	Output / 1M	Blended 3:1	Context
Qwen: Qwen3.8 Omni Flash	$0.15	$0.47	$0.23	1M
Z.ai: GLM 5.3 FlashX	$0.37	$1.25	$0.59	1.0M
DeepSeek: DeepSeek V4.1 Flash	$0.03	$0.5	$0.147	1.0M
Qwen: Qwen3.8 Flash	$0.15	$0.47	$0.23	1M
Z.ai: GLM 5.3 Flash	$0.15	$0.5	$0.237	1.0M
DeepSeek: DeepSeek V4 Flash Vision Exp	$0.216	$0.647	$0.323	1.0M

Other OpenAI models

Model	Input / 1M	Output / 1M	Blended 3:1	Context
GPT-4	$30	$60	$37.50	8K
GPT-3.5 Turbo 16k	$3	$4	$3.25	16K
GPT-3.5 Turbo Instruct	$1.50	$2	$1.63	4K
GPT-3.5 Turbo (older v0613)	$1	$2	$1.25	4K
GPT-4 Turbo	$10	$30	$15	128K
GPT-4o	$2.50	$10	$4.38	128K

All OpenAI API prices