GPT-6.1 Terra goes GA on Amazon Bedrock as Step Functions become MCP agent tools

AWS's November 2 weekly roundup confirmed that OpenAI's GPT-6.1 Terra is generally available on Amazon Bedrock, with token costs AWS says are roughly 50% below comparable models. One source dates the GA to October 26. The same roundup lets Step Functions workflows be exposed as agent tools through Bedrock AgentCore Gateway using the Model Context Protocol, so agents can call existing orchestrated workflows.

The Terra listing reflects Andy Jassy's multi-model thesis for Bedrock. Jassy has said Bedrock could rival EC2 in scale, and AWS is adding China's Kimi and GLM models alongside Western ones. He expects six to eight models to handle more than 95% of workloads. Swami Sivasubramanian said Bedrock is the fastest-growing multi-billion-dollar service in AWS history, with Fortune 500 spending up nearly 7x year over year.

Having OpenAI models on Bedrock marks a significant shift from the period when OpenAI was effectively exclusive to Azure. Bedrock now sells both OpenAI and Anthropic models, making it a neutral marketplace.

The caveat is that the '50% lower' price claim is AWS's own framing. Customers should compare effective cost per completed task rather than per-token list prices.