AWS published an OpenCode config that splits planning and execution across open-weight models.

Plan-mode work goes to Kimi K3 for its 1M context, GPT-OSS 120B is the default, and build-mode work goes to Nemotron 3 Super 120B for throughput. Latency-tolerant batch refactors can run on the Bedrock Flex tier at 50% off, and global cross-Region inference costs about 10% less (AWS). A concrete recipe for putting different models on different phases inside one terminal agent, which is more useful than the usual "here's how to call Bedrock" post.