Vendor · OpenAI

OpenAI LLMs

OpenAI makes ChatGPT and the GPT model family. The GPT-6 generation splits into Astra, Sol and Luna tiers so teams can trade capability against cost, and earlier GPT-5 and GPT-4o models remain available for existing projects.

We currently review 7 OpenAI models across 7 families. Entry pricing runs from API: $0.10 in / $0.50 out per M tokens (GPT-6 Luna) to $20/mo (ChatGPT). 3 of them are legacy models that have been superseded, and each is labelled with its replacement.

Family

o1

o1 Paid · API: $15 in / $60 out per M tokens

Legacy model, superseded by the GPT-6 family. o1 is an earlier OpenAI reasoning model designed to think through a problem before answering.

Family

GPT-6 Sol

GPT-6 Sol Paid · API: $2 in / $10 out per M tokens

GPT-6 Sol, launched on 22 September 2026, brings GPT-6 Astra's technology to a faster, cheaper model at $2 and $10 per million tokens. OpenAI states these are permanent prices, not promotional rates.

Family

GPT-6 Luna

GPT-6 Luna Paid · API: $0.10 in / $0.50 out per M tokens

GPT-6 Luna, launched on 22 September 2026, is the small, low-cost member of the GPT-6 family at $0.10 and $0.50 per million tokens. It targets high-volume tasks where cost and speed matter most.

Family

GPT-6 Astra

GPT-6 Astra Paid · API: $10 in / $50 out per M tokens

GPT-6 Astra, released by OpenAI on 3 September 2026, is the company's most capable model to date, with state-of-the-art results on computer use, coding, cybersecurity and science. It sits at the top of the GPT-6 family in both capability and price.

Family

GPT-5

GPT-5 Paid · API: $1.25 in / $10 out per M tokens

Legacy model, superseded by GPT-6 Astra, Sol and Luna. OpenAI's headline model for 2025-2026.

Family

GPT-4o

GPT-4o Paid · API: $2.50 in / $10 out per M tokens

Legacy model, superseded by the GPT-6 family. GPT-4o is an earlier OpenAI multimodal model that handles text, images and audio in one system.

Family

ChatGPT

ChatGPT Freemium · $20/mo

OpenAI's flagship conversational AI. Used by professionals across every category for drafting, summarization, structured thinking, and as a Swiss-army-knife reasoning assistant.

Frequently asked questions

Which OpenAI model should I start with?

GPT-6 Sol is a sensible place to begin because it is the newest current entry we track. Compare it with the cheaper tier if you mostly need drafting and summarizing, and with the premium tier only for the hardest work.

How does OpenAI pricing work?

Most OpenAI models are sold by usage, priced per million tokens for input and output, while consumer apps use monthly plans. Each model page lists the starting price we verified.

Where can I see how OpenAI models compare with other vendors?

Every model has its own review, and the main LLM index at /llm/ lists all vendors side by side. Popular head-to-head pages are linked from each review.