# GPT-5.6 Terra and Luna Are Now Live on Amazon Bedrock in AWS GovCloud!

Hey everyone, it's Shiichan! I've got some good news from the Bedrock side of things today.

## What was announced?

Over on AWS What's New, AWS announced that OpenAI's GPT-5.6 Terra and Luna are now generally available on Amazon Bedrock in AWS GovCloud (US-West) and AWS GovCloud (US-East). GovCloud is a special AWS region built for government agencies and heavily regulated industries, and these models run on Bedrock's next-generation inference engine, built for high performance, security, and reliability.

## Why it matters

GovCloud is isolated from AWS's standard regions to serve government and regulated workloads, so new models usually take a while to show up there. With GPT-5.6 now rolling out to GovCloud, teams working under strict compliance requirements can finally reach for OpenAI's newest models through Bedrock too.

## What changes

GPT-5.6 sets a new bar for both how hard a problem it can solve and how much intelligence it packs per token. It comes in two models with different roles:

- Terra: balanced performance, delivering GPT-5.5-level capability at half the cost
- Luna: fast, cost-efficient inference at the lowest price point

That means GovCloud customers can now build autonomous coding agents, run long-horizon genomics and biology analyses, and carry out advanced cybersecurity research with these newer models.

## Dive Deep

A few technical details worth knowing:

- Context window: both Terra and Luna support 1 million token context windows, so you can feed in a full codebase, a long document, or a multi-turn agent history in a single request
- Prompt caching: explicit cache breakpoints are supported, and repeated context across agentic workflows is billed at a 90% discount, so cost doesn't compound as you scale
- Getting started: use the [Amazon Bedrock Console](https://console.amazonaws-us-gov.com/bedrock/) or call the Responses API on the bedrock-mantle endpoint
- For the full spec sheet, check the [Bedrock documentation](https://docs.aws.amazon.com/bedrock/latest/userguide/model-cards-openai.html), and see the [regional availability page](https://docs.aws.amazon.com/bedrock/latest/userguide/models-region-compatibility.html#model-regions-openai) for supported regions

## Wrap-up

- OpenAI's GPT-5.6 Terra and Luna are now generally available on Amazon Bedrock in AWS GovCloud (US-West / US-East)
- Terra matches GPT-5.5-level performance at half the cost, while Luna offers fast inference at the lowest price point
- Both support 1 million token context windows and prompt caching with a 90% discount
- Get started via the Amazon Bedrock Console or the Responses API on the bedrock-mantle endpoint
- A solid pick if you're building on OpenAI's latest models for government or regulated workloads through Bedrock