GPT-3.5 Turbo

GPT-3.5 Turbo is OpenAI's earlier fast chat model, able to understand and generate natural language and code.

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input · usd / 1m tok

$0.50

output · usd / 1m tok

$1.50

context window

16ktokens

modalities · in → out

pricing

base api ratesusd per 1m tokens

input: $0.50
output: $1.50

providers

OpenAI hosts GPT-3.5 Turbo. Impossibl routes your request intelligently and handles failover automatically when a provider is down.

OpenAI

specifications

takes text in, gives text outopenai/gpt-3.5-turbo

creatorOpenAI
model typeText generation
context window16,000 tokens
maximum outputnot published
input
takes text in, gives text out
outputtext
tool callingnot verified
releasedmar 1, 2023
endpoint/v1/chat/completions

unknown means the public catalog does not establish that fact. a model's documented capabilities can differ from what a particular api supports. see the model documentation for integration details.

try it · your prompt, this model, live

# responses API
import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ["IMPOSSIBL_API_KEY"],
    base_url="https://api.impossibl.com/v1",
)

resp = client.responses.create(
    model="openai/gpt-3.5-turbo",
    input="▌",
)
print(resp.output_text)

edit the prompt, then run

# responses API
import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ["IMPOSSIBL_API_KEY"],
    base_url="https://api.impossibl.com/v1",
)

resp = client.responses.create(
    model="openai/gpt-3.5-turbo",
    input="▌",
)
print(resp.output_text)

edit the prompt, then run

benchmarks

intelligence index

5.5#108 of 108 models on the gateway

coding index10.7#64 of 64
gpqa29.7%#80 of 80

GPQA29.7%

Intelligence Index5.49
coding index (API)10.7
intelligence index (API)5.5

view source ↗all source data and breakdowns (json) ↗

each configuration is listed separately; these evaluations describe the tested model configuration, and performance and costs can differ on impossibl. unmeasured scores are omitted and api values keep their source units. last checked 2026-10-14. some source data could not be refreshed; retained results may be older.

compare GPT-3.5 Turbo with other models

frontier labs and open weights, best-ranked firstusd / 1m tok · in / out

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impossibl models --all →

frequently asked questions

What is GPT-3.5 Turbo?

GPT-3.5 Turbo is OpenAI's earlier fast chat model, able to understand and generate natural language and code. It is optimised for chat and traditional completion tasks and served as the low-cost tier before GPT-4o mini took over that role.

How much does GPT-3.5 Turbo cost?

GPT-3.5 Turbo costs $0.50 per million input tokens and $1.50 per million output tokens through the Impossibl API. All rates are in USD.

view the pricing table ↑

What is the context length of GPT-3.5 Turbo?

GPT-3.5 Turbo has a 16,000-token context window through the Impossibl API.

What inputs and outputs does GPT-3.5 Turbo support?

GPT-3.5 Turbo accepts text as input. GPT-3.5 Turbo returns text.

How do I use GPT-3.5 Turbo through an API?

GPT-3.5 Turbo is available through the Impossibl API. Use openai/gpt-3.5-turbo as the model identifier with /v1/chat/completions. The quickstart explains how to create an API key and send your first request.

follow the api quickstart →

When was GPT-3.5 Turbo released?

OpenAI released GPT-3.5 Turbo on March 1, 2023.

Creator release announcement ↗

this page describes GPT-3.5 Turbo as listed by the impossibl public api. prices and availability come from that catalog, refreshed here every five minutes. this is an impossibl offering, not a comparison of independent hosting-provider quotes. model descriptions and release dates, where available, use the creator sources linked under the answers above.

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