GPT-5.6 becomes an option inside Kiro

Developers using Kiro can now run GPT-5.6 there to plan, build, review and test software, OpenAI said, framing the addition around price-performance.
The cost side moved recently too: OpenAI cut API and credit pricing for GPT-5.6 Sol by over 20% as of August 21, 2026, according to its GPT-5.6 announcement page.
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