AI Content Generator

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Model Selection Guide

You can choose between the following OpenAI models in the extension settings. Each model offers a different balance of content quality, speed, and cost.

For most OpenCart stores, GPT-5.6 Terra provides the best overall balance. If you generate content in bulk and want to minimise cost, choose GPT-5.6 Luna.

⚡ GPT-5.6 Luna — Lowest-Cost Option

Model name: gpt-5.6-luna

Speed: Very fast

Cost: Lowest-priced model in the GPT-5.6 family

Best for:

  • Product descriptions
  • SEO titles and meta descriptions
  • Product tags and keywords
  • FAQs
  • Short summaries
  • Bulk content generation
  • Simple translation tasks

Usage suggestion: Choose GPT-5.6 Luna when generating content for many products and keeping API costs low is your priority.

Approximate API cost:

  • Input: $0.20 per 1 million tokens
  • Cached input: $0.02 per 1 million tokens
  • Output: $1.20 per 1 million tokens

GPT-5.6 Luna supports text and image input, structured output, function calling, and a context window of approximately 1.05 million tokens. View the official model details.

🚀 GPT-5.6 Terra — Recommended

Model name: gpt-5.6-terra

Speed: Fast

Cost: Moderate

Best for:

  • High-quality product descriptions
  • SEO-friendly category content
  • Landing pages
  • Blog articles
  • Multilingual content
  • Marketing copy
  • Content requiring better instruction-following
  • Structured content generation

Usage suggestion: This is the recommended option for most OpenCart stores. It provides an excellent balance between content quality, speed, and API cost.

Approximate API cost:

  • Input: $2.00 per 1 million tokens
  • Cached input: $0.20 per 1 million tokens
  • Output: $12.00 per 1 million tokens

GPT-5.6 Terra supports advanced reasoning, text and image input, structured output, and a context window of approximately 1.05 million tokens. View the official model details.

🧠 GPT-5.6 Sol — Highest-Quality Option

Model name: gpt-5.6-sol

You may also use the alias: gpt-5.6

Speed: Slower than Luna and Terra for complex requests

Cost: Highest among the three recommended options

Best for:

  • Complex and detailed content
  • Advanced SEO content planning
  • Long-form articles
  • Content requiring careful reasoning
  • Complicated multilingual instructions
  • Highly polished marketing copy
  • Complex structured-data generation

Usage suggestion: Choose GPT-5.6 Sol when maximum quality and accuracy matter more than generation cost. For ordinary product descriptions, this model may be more powerful and expensive than necessary.

Approximate API cost:

  • Input: $5.00 per 1 million tokens
  • Cached input: $0.50 per 1 million tokens
  • Output: $30.00 per 1 million tokens

GPT-5.6 Sol is OpenAI’s frontier model for complex professional work. It supports advanced reasoning, text and image input, structured output, and a context window of approximately 1.05 million tokens. View the official model details.

Quick Model Comparison

ModelRecommended useInput costOutput cost
gpt-5.6-lunaLow-cost bulk content generation$0.20/1M tokens$1.20/1M tokens
gpt-5.6-terraBest balance for most OpenCart stores$2.00/1M tokens$12.00/1M tokens
gpt-5.6-solMaximum quality for complex content$5.00/1M tokens$30.00/1M tokens

Which Model Should You Choose?

  • Choose GPT-5.6 Luna for affordable bulk generation.
  • Choose GPT-5.6 Terra for the best balance of quality and cost.
  • Choose GPT-5.6 Sol for complex or premium-quality content.

For most users of this extension, we recommend starting with:

gpt-5.6-terra

You can switch to Luna if you want to reduce costs or Sol if you need more advanced results.

How to Configure the Model in OpenCart

To select your preferred OpenAI model:

  1. Sign in to your OpenCart Admin Panel.
  2. Navigate to SEO Extensions → AI Generator.
  3. Locate the field labelled GPT Model.
  4. Enter one of the following model names:
    • Lowest cost: gpt-5.6-luna
    • Recommended: gpt-5.6-terra
    • Highest quality: gpt-5.6-sol
  5. Click Save.

Important Notes

  • API charges depend on the number of input and output tokens processed.
  • Cached input pricing applies only when OpenAI’s prompt-caching requirements are met.
  • Longer instructions and generated content consume more tokens.
  • Advanced reasoning may increase response time and token usage.
  • You must add a valid OpenAI API key in the extension settings.
  • Model access may depend on your OpenAI API account and usage tier.
  • An invalid, unavailable, or incorrectly entered model name will result in an API error.
  • API pricing may change. Refer to the official OpenAI model documentation for current information.