The GPT‑5.6 family, which includes the Sol, Terra, and Luna variants, is now available inside Kiro. Kiro is a software development agent that turns high‑level intent into clear requirements, technical designs, and executable tasks, supporting AI‑native coding at scale.
What this provides to developers
The GPT‑5.6 models aim to deliver more useful work per token, offering stronger performance per dollar and on‑demand capability for complex tasks. Within Kiro, developers can apply these capabilities to longer‑running development efforts that are grounded in team requirements, the existing codebase, and internal standards.
Kiro supplies structured context — specifications, technical designs, and task information — from the outset, helping GPT‑5.6 understand what a team is building, how the system should operate, and what the final implementation needs to achieve.
Performance and cost efficiency
OpenAI and Amazon Web Services (AWS) have collaborated to optimize the Kiro environment and OpenAI models. According to testing on Terminal‑Bench 2.1, GPT‑5.6 Terra completed successful tasks in Kiro with about an 82% cost reduction. Kiro’s spec‑driven approach is reported to shorten the path to working solutions and reduce missteps, meaning less wasted effort and better value from each development session.
Ongoing work
OpenAI and AWS say they will continue working together to further improve OpenAI model performance in Kiro and to help developers extract more value from AI across the software development lifecycle.
The GPT‑5.6 family is available in Kiro. More information for getting started is available at kiro.dev.
