> GPT-3.5 Turbo (Nov 2023) is a closed AI model from OpenAI, released 6 Nov 2023. Index score 91 (GPT-4 = 100), rank 200 of 229 ranked models. API price $1.5 in / $2.0 out per million tokens, 4K context.

[Models](https://themodelindex.org/models/) /[OpenAI](https://themodelindex.org/labs/openai/)

# GPT-3.5 Turbo (Nov 2023)

OpenAI

Released 6 Nov 2023

Closed

[Compare](https://themodelindex.org/compare/gpt-3-5-turbo-nov-2023-vs-llama-2/)

9177–105

Index score

#200 · provisional, limited data

1/ 8

Core tests taken

1 of 6 areas · plus 1 anchor tests

−14

Versus the frontier at release

best then: GPT-4 Turbo

Replaced by [GPT-3.5 Turbo (Jan 2024)](https://themodelindex.org/models/gpt-3-5-turbo-jan-2024/)

$1.5/ $2.0

Price per million tokens

input / output, list price

4K

Context window

tokens it reads at once

## Where it sits · on the frontier

_Chart: Model Index score of every scored model since late 2022, with the best closed and best open model over time_

GPT-4 reached this score 8 months earlier.

## Test results · by area · tick = best by any model

Show 1 anchor tests

Reasoning & knowledge

evidence

GPQA Diamond

28%

Humanity's Last Exam

no result

Maths

evidence

FrontierMath T1-3

no result

Coding

no evidence yet

SWE-bench Verified

no result

Terminal-Bench

no result

Agents

no evidence yet

APEX-Agents

no result

Novel problems

no evidence yet

ARC-AGI-2

no result

Long tasks

no evidence yet

METR time horizon

no result

Independent results from the Epoch AI benchmarking hub, best reasoning setting. The core tests are shown here; anchor tests also inform the score and can be shown above.

## What others say · rank on each leaderboard

The Model Index

independent tests, our method

#200

of 219 · 91

Further left is better. Leaderboards measure different things: LMArena is people voting blind between two answers, the others are test scores. Click any row for the source.

## Best at · top three among current models

Replaced by GPT-3.5 Turbo (Jan 2024); it no longer leads any category among current models.

Where this model places in the top three of today's models, on category leaderboards and on our core tests.

## Where to use it · prices checked 1 Oct 2026

#### From the lab

ChatGPT

app · subscription

↗

OpenAI API

API

↗

Provider prices come from OpenRouter's live listing; going direct to a provider can differ. Subscriptions are the lab's own apps.

## Facts and sources

Released

6 Nov 2023

Announcement

not linked yet

Release entry

–

Scored as

GPT-3.5 Turbo (Nov 2023)

Artificial Analysis index

–

Output speed

–

Hugging Face

closed weights

## OpenAI releases · around this one

ChatGPT

Closed

30 NOV 2022

GPT-4

Closed

14 MAR 2023

index 100

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Source: https://themodelindex.org/models/gpt-3-5-turbo-nov-2023/ · The Model Index · data as of 2026-10-01