AI and Automation

Your OpenAI API Key vs. Built-in Bulko AI Credits

Bulko team May 9, 2026 5 min read

Bulko offers two ways to use artificial intelligence (AI) to optimize your email marketing campaigns: built-in AI credits and integration with your own OpenAI API key. The optimal choice depends on your needs, AI usage volume, and budget. In this article, we will examine both approaches in detail to help you make an informed decision.

Bulko AI Credits: Simplicity and Predictability

Built-in Bulko AI credits allow you to use the platform's AI functions without directly managing the OpenAI API. Bulko uses the Gemini Flash model (formerly known as PaLM 2) from Google, optimized for speed and cost-effectiveness. Each AI operation (e.g., text generation, email subject line improvement, reply analysis) consumes a certain number of credits. The cost of each operation in credits is fixed, ensuring predictable expenses.

Advantages of using Bulko AI Credits:

  • Ease of use: No API configuration or key management is required. Everything is integrated into the Bulko platform.
  • Cost predictability: A fixed cost in credits for each AI operation allows you to accurately plan your budget.
  • Optimization for email marketing: Gemini Flash is specifically tailored for email marketing tasks, such as generating email text, improving subject lines, and analyzing replies.
  • Bulko Support: All questions related to the use of AI credits are resolved through Bulko support.

When to use Bulko AI Credits:

  • Initial stage: If you are just starting to use AI in email marketing, Bulko AI credits are a great way to get acquainted with AI capabilities without technical complexities.
  • Small usage volumes: If you use AI for a small number of tasks, Bulko AI credits may be a more economical option than paying OpenAI directly.
  • Preference for simplicity and convenience: If ease of use and no need to manage the API are important to you, Bulko AI credits are the best choice.

Your OpenAI API Key: Flexibility and Control

Bulko allows you to use your own OpenAI API key to access more powerful models, such as GPT-4 and GPT-4 Turbo. This gives you greater flexibility and control over AI usage but requires independent key management and direct payment to OpenAI.

Advantages of using your own OpenAI API key:

  • Access to more powerful models: GPT-4 and GPT-4 Turbo offer higher quality text generation and broader capabilities than Gemini Flash.
  • Flexibility in model selection: You can choose between different OpenAI models depending on your needs and budget.
  • Finer control: You have full control over the API parameters and can configure them to achieve optimal results.
  • Potential savings at high volumes: With high volumes of AI usage, paying OpenAI directly may be more economical than using Bulko AI credits.

When to use your own OpenAI API key:

  • High usage volumes: If you actively use AI to generate large amounts of content, analyze data, or other resource-intensive tasks, paying OpenAI directly may be more cost-effective.
  • Need for more powerful models: If you require high-quality text generation or complex AI functions, GPT-4 or GPT-4 Turbo may be necessary.
  • Technical expertise: If you have experience with APIs and are willing to manage the key and parameters yourself, using your own OpenAI API key is a good choice.
  • Individual settings: If you need fine-tuning of AI parameters, using your own OpenAI API key will allow you to achieve optimal results.

Comparison: Bulko AI Credits vs. Your OpenAI API Key

To help you make a decision, let's consider the key differences between the two approaches:

Characteristic Bulko AI Credits Your OpenAI API Key
AI Model Gemini Flash (Google) GPT-4, GPT-4 Turbo (OpenAI)
Cost Fixed cost in credits per operation Payment to OpenAI directly (depends on usage)
Ease of Use Very simple (integrated into Bulko) Requires API configuration and key management
Flexibility Limited High (model selection, API parameters)
Support Bulko OpenAI (for API issues), Bulko (for integration issues)

Example: Suppose you need to generate 1000 email subject line variations for A/B testing. Using Bulko AI credits will cost you a fixed number of credits for each generation. When using your own OpenAI API key, the cost will depend on the selected model (GPT-4 or GPT-4 Turbo) and the number of tokens used for generation. With large volumes of generation and the right choice of OpenAI model, this may be cheaper, but requires preliminary assessment and cost monitoring.

How to switch between AI Credits and your OpenAI API Key

Bulko makes it easy to switch between using AI credits and your own OpenAI API key. To do this:

  1. Go to your Bulko account settings.
  2. Find the "AI and Automation" section.
  3. Select your preferred method of using AI: "Bulko AI Credits" or "Your OpenAI API Key".
  4. If you selected "Your OpenAI API Key", enter your API key and save the changes.

Important: When using your own OpenAI API key, make sure you have sufficient funds in your OpenAI account. Bulko is not responsible for expenses related to the use of your OpenAI API key.

Recommendations for choosing

Ultimately, the choice between Bulko AI credits and your own OpenAI API key depends on your individual needs and resources. If you are just starting to use AI or prefer simplicity and predictability, Bulko AI credits are a great choice. If you need more powerful models, greater flexibility, or plan to use AI in large volumes, using your own OpenAI API key may be more beneficial. We recommend starting with Bulko AI credits and, as your needs grow, consider switching to your own OpenAI API key.

Regardless of the approach you choose, Bulko provides all the necessary tools for effectively using AI in your email marketing campaigns. Be sure to check out other articles in our knowledge base dedicated to AI and automation, such as AI Content Rotation and Reply Classification, to learn more about the platform's capabilities.

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