Kiro, an AWS-supported coding platform, has made a significant move by integrating OpenAI's latest model family, GPT-5.6, across its IDE, CLI, and web interface. This marks a key shift as Kiro transitions away from its previous reliance on Anthropic's Claude models.
What's New in the GPT-5.6 Rollout
The launch features three distinct models: Sol, Terra, and Luna, each catering to different needs on the performance-cost spectrum. Sol is positioned as the powerhouse, designed for intricate coding tasks, boasting a credit multiplier of 2.4x. This means it consumes user credits rapidly while delivering exceptional results. Impressively, Sol achieved an 80 on the Coding Agent Index and scored 88.8% on Terminal-Bench 2.1.
In contrast, Terra strikes a balance with a 1.2x multiplier, making it suitable for routine development tasks. Last but not least, Luna, with a 0.6x multiplier, is tailored for speed and cost-effectiveness, ideal for less demanding projects.
Infrastructure and Availability
All variants share a substantial 272K context window and are powered by Amazon Bedrock infrastructure, featuring an “Auto” routing mode to ensure queries are directed to the appropriate model based on their complexity. Currently, this rollout is in an experimental phase, accessible only to subscribers at the Pro, Pro+, Pro Max, and Power tier levels, and is geographically limited to the us-east-1 and eu-central-1 regions.
