GPT-4 Turbo is a large-context variant of GPT-4 with 128K context window, now largely superseded by faster, cheaper GPT-4o.

How good is GPT-4 Turbo?

It was the gold standard for GPT-4 applications, but GPT-4o is now 2x faster and 50% cheaper with equivalent quality.

What can GPT-4 Turbo do?

It excels at long document processing, JSON mode outputs, vision tasks, and function calling for legacy applications.

Should I use GPT-4 Turbo or GPT-4o?

Use GPT-4o for new development. GPT-4o is faster, cheaper, and more capable. Keep GPT-4 Turbo only for legacy compatibility.

How much does GPT-4 Turbo cost?

GPT-4 Turbo pricing is $10.00 per 1M input tokens and $30.00 per 1M output tokens.

LangFast

Beta

GPT-4 Turbo

Large-context GPT-4. Slower and pricier than newer models.

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Community Sentiment

Mostly Positive

Based on Reddit reviews

Community Verdict

Best for Legacy Support

Based on Reddit reviews

Input Modalities

Text, Images

Output Modalities

Text

Price / 1M tokens

$10$30

InputOutput

Best For

Legacy applications built on GPT-4 Turbo API

Reproducible outputs with seed parameter

Vision tasks with image understanding

Function calling and parallel function calls

Avoid For

ALL NEW DEVELOPMENT (use GPT-4o instead)

Cost-sensitive apps (GPT-4o is 50% cheaper)

Latency-sensitive apps (GPT-4o is 2x faster)

Audio processing (not supported)

128,000 context window

4,096 max output tokens

Dec 1, 2023 knowledge cutoff

Reasoning not supported

Parameters

While OpenAI documents a unified parameter set for the Chat Completions and Responses APIs, each model supports only a limited subset of model-specific parameters and values. This table lists the supported model-specific GPT-4 Turbo API parameters and allowed values.

Parameter	Description	Path	Supported Values
Model	Selects the model version for the request	model	gpt-4-turbogpt-4-turbo-2024-04-09
Message roles	Defines the role of the message in the input	messages[].role	developersystemuserassistant
Max output tokens	Max output tokens the model may generate	max_completion_tokens	16 .. 4,096
Output format	Specifies the output format, including structured JSON schemas	response_format	textjson_object
Temperature	Controls how random or deterministic the output is	temperature	0 .. 2
Top P	Controls how diverse the output tokens are	top_p	0 .. 1
Presence penalty	Encourages the model to introduce new topics	presence_penalty	-2 .. 2
Frequency penalty	Reduces repetition of the same words or phrases	frequency_penalty	-2 .. 2
Reasoning effort	Controls the depth of internal reasoning used by the model	reasoning_effort	Not supported
Reasoning summary	Controls whether the model produces a concise or detailed reasoning summary	reasoning_summary	Not supported
Verbosity	Controls how brief or detailed the generated response is	verbosity	Not supported

Pricing

GPT-4 Turbo API pricing is based on token usage for input and output. Prices are listed per 1M tokens, with lower rates for cached input. Tool-specific features may add per-call fees.

Text tokens

Per 1M tokens

Input$10.00

Cached inputN/A

Output$30.00

Example costs (GPT-4 Turbo)

TASK

APPROX COST

Long document analysis

~$0.30–$1.00

Code generation session

~$0.20–$0.60

Vision task

~$0.15–$0.50

Modalities

What the model can accept and produce

TextInput and output

ImagesInput only

AudioNot supported

VideoNot supported

Features

Platform-level capabilities

StreamingSupported

Function callingSupported

Structured outputsNot supported

Fine-tuningNot supported

DistillationNot supported

Predicted outputsNot supported

Tools

Tools supported by this model when using the Responses API.

Web searchNot supported

File searchSupported

Image generationNot supported

Code interpreterSupported

MCPSupported

Computer useNot supported

Snapshots

GPT-4 Turbo model snapshots ensure stable behavior by locking a specific version. See all available snapshots and aliases below.

gpt-4-turbo

↪ gpt-4-turbo-2024-04-09

gpt-4-turbo-2024-04-09

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