OpenAI Releases Its Most Advanced Model, GPT‑5.6, Saying It Outperforms Fable 5

IBL News | New York

OpenAI unveiled the GPT‑5.6 family of models last week, which includes a new flagship named Sol, alongside a balanced model for everyday work, Terra, and its most cost-efficient model, Luna.

“GPT‑5.6 Sol sets a new standard for both intelligence and efficiency, achieving state-of-the-art results across coding, knowledge work, cybersecurity, and science while outperforming previous and competing frontier models with fewer tokens and at a lower estimated cost,” said the San Francisco – based startup.

The GPT‑5.6 models outperform Claude Fable 5 in adaptive and scientific reasoning, agentic work, coding, and general capabilities. They also win when completing tasks in less time and at around one-sixteenth of the cost, according to OpenAI.

These three variants –– Sol (its workhorse), Terra (an intermediate option), and Luna (its budget-friendly option) –– present, in the words of Sam Altman, the CEO of OpenAI, “the strongest cybersecurity model yet, achieving frontier performance with significantly fewer tokens.”

OpenAI also released a new tool called ChatGPT Work, a workplace companion for enterprise teams that runs on desktop, web, and mobile and helps with daily clerical tasks such as drafting documents, spreadsheets, and presentations.

The company said that 5.6 is available across ChatGPT, Codex, and the OpenAI API.

Availability per million tokens is priced as follows: Sol is $5 input / $30 output, Terra is $2.50 input / $15 output, and Luna is $1 input / $6 output.