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OpenAI models: All the models and what they're best for

What happened
Based on Zapier Blog · Jul 10, 2026

OpenAI has released multiple AI models in rapid succession, including GPT-5.6 Sol, GPT-5.6 Terra, and GPT-5.6 Luna, each with distinct capabilities and pricing tiers.

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OpenAI models: All the models and what they're best for
Zapier Blog — Zapier
Key points
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Keeping track of all the new AI models getting released at the moment is practically a full-time job.
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The most recent model, GPT-5.6, was released less than three months after GPT 5.5, which itself was released two months after GPT-5.4.
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I've been writing about OpenAI's models for the past few years, and it feels like every time I publish an article, another new model drops.
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OpenAI is one of the worst offenders (or prolific innovators), and things aren't helped by how confusing all the OpenAI model names are.
Key numbers
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OpenAI continues to release new AI models at a rapid pace, with GPT-5.
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The model is priced higher than its predecessors, with GPT-5.
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6 Terra and GPT-5.

OpenAI continues to release new AI models at a rapid pace, with GPT-5.6 Sol being the latest flagship reasoning model, designed for complex tasks such as code generation, document analysis, and problem-solving. The model is priced higher than its predecessors, with GPT-5.6 Terra and GPT-5.6 Luna offering more affordable alternatives. Users must evaluate whether the advanced performance justifies the cost for their specific needs.

GPT-5.6 Terra serves as a middle-ground option between the high-performance Sol model and the lighter Luna version, balancing power and affordability. GPT-5.6 Luna is optimized for faster, cost-effective responses in well-defined tasks like chatbot interactions. Legacy models such as GPT-5.5 and GPT-5.4 mini remain available but have been superseded by newer releases, with pricing varying based on performance and usage requirements.

GPT-4.1 remains OpenAI’s most versatile non-reasoning multimodal model, excelling in general-purpose tasks but lacking the specialized capabilities of reasoning models. It functions as a cost-effective option for broad applications, though dedicated models may perform better in specific scenarios like multi-step code generation or text summarization.

OpenAI’s API provides access to these models, enabling developers to integrate them into custom tools and workflows. Zapier’s AutomationBench evaluates model performance in real-world business scenarios, helping teams select the most suitable option for their automation needs.

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