Evaluation & Testing

OpenAI GPT Token Counter

Efficiently count OpenAI tokens for various models including GPT-5 and GPT-4.

Status
Not yet determined
Last checked
Checked · Oct 10, 2026
License
Open source
Pricing
Free tier · from $0
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What it is

A tool to accurately count the number of tokens in a string for all OpenAI Text models, aiding developers in optimizing their usage and costs. Supports GPT-5, GPT-4, GPT-3.5-turbo, and specialized models.

The OpenAI GPT Token Counter provides precise and efficient token counting capabilities specifically tailored for developers working with various OpenAI Text models, ensuring optimal usage and cost management.

When it fits — and when it doesn’t

A good fit for

  • JavaScript developers who need accurate token counting for optimizing their use of OpenAI Text models.

  • Teams working on projects with strict budget constraints and need to manage API costs effectively.

Look elsewhere if

  • Projects that require real-time token counting in a cloud environment, as this tool is designed for local integration.

  • Developers who are not using JavaScript or do not have the capability to integrate a library into their projects.

Known weaknesses

Each one links to the public issue, changelog or docs page it came from, where we have one.

  1. 01

    Limited language support beyond JavaScript

    The tool is primarily developed for and optimized in JavaScript, which may limit its accessibility to developers working with other languages.

  2. 02

    Potential inaccuracies due to reliance on community-maintained mappings

    Token counting accuracy can vary depending on the up-to-date status of model-specific tokenization rules maintained by the community, which may not always be current.

  3. 03

    Complex setup for non-standard environments

    Setting up and integrating the tool in non-standard or less common development environments can require additional configuration steps that are not well-documented.

What it does well

  • Supports all OpenAI Text models including GPT-5, GPT-4, and specialized models.

  • Accurate token counting for optimizing API usage and cost management.

  • Easy integration as a library in JavaScript projects.

Pricing

Free tier
YesOpen source — free to use
Paid from
$0
Model
Flat rate
Enterprise plan
No

Pricing not independently confirmed — check the vendor’s page.

Performance benchmarks

How Fast Is It?

Set up OpenAI GPT Token Counter

Setup steps, common gotchas and what to check after 30 days.

Open the setup guide →
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OpenAI GPT Token Counter — tracked on AI Navigator

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