Modelpeers

GPT-5.6 Sol, GPT-5.6 Terra and GPT-5.6 Luna

3 models from OpenAI

New release

GPT-5.6 family released: Sol, Terra and Luna

OpenAI released three GPT-5.6 models on the Responses, Chat Completions and Batch APIs. The gpt-5.6 alias routes to gpt-5.6-sol, and the release adds max reasoning effort, Pro mode and multi-agent orchestration in beta.

Who is affected:
Developers on GPT-5.5, GPT-5.4 and older models.
What to do:
Evaluate gpt-5.6-terra or gpt-5.6-luna for cost-sensitive workloads.

Source

"including GPT-5.6 Sol for frontier capability, GPT-5.6 Terra for a balance of intelligence and cost, and GPT-5.6 Luna for efficient, high-volume workloads."

OpenAI API changelog

Published

Open the sourcedevelopers.openai.com

Modelpeers tracks changes to AI agents and models, each from its source. Follow GPT-5.6 Sol to get a weekly email when it changes.