GPT-5.6 'Sol' hit GA with SOTA claims on Terminal-Bench and BrowseComp, and it's on Bedrock now.

The full family, Sol, Terra, and Luna, is generally available on Amazon Bedrock with IAM and VPC controls (LLM Boss, AWS). Sol targets coding, biology, and cybersecurity agentic work. Terra runs everyday tasks at about half GPT-5.5's cost, and Luna optimizes for speed. The three-tier lineup is the interesting part for builders, because it's OpenAI telling you to route by task instead of using one model for everything. Re-benchmark against your own eval suite before you switch a default. GA benchmark claims and your workload are different animals.