# Objective

- Adds the three GPT-5.6 models (Sol, Terra, and Luna) that OpenAI now
serves through AWS Bedrock's `bedrock-mantle` endpoint, so they can be
selected as built-in models under the Amazon Bedrock provider.
- Follows up on the native Bedrock Mantle support added in #60480.
- Addresses the feature request in
https://github.com/zed-industries/zed/discussions/61003.

## Solution

- Adds `Gpt5_6Sol`, `Gpt5_6Terra`, and `Gpt5_6Luna` variants to
`MantleModel` in `crates/bedrock/src/models.rs`, with per-model
`id`/`request_id`/`display_name` and shared capability arms.
- All three are Responses-API, `bedrock-mantle`-only models, so they
reuse the existing Mantle request/response plumbing, region gating,
bearer-token auth, and model-picker wiring (`MantleModel::iter()`) with
no other changes required.
- Metadata mirrors the AWS Bedrock model cards
([Sol](https://docs.aws.amazon.com/bedrock/latest/userguide/model-card-openai-gpt-56-sol.html),
[Terra](https://docs.aws.amazon.com/bedrock/latest/userguide/model-card-openai-gpt-56-terra.html),
[Luna](https://docs.aws.amazon.com/bedrock/latest/userguide/model-card-openai-gpt-56-luna.html)):
272K context window, image input, tool and thinking support, and
`openai.gpt-5.6-{sol,terra,luna}` request IDs.
- Updates the Amazon Bedrock section of "Use a Gateway" to mention the
GPT-5.6 family.

## Testing

- `cargo test -p bedrock` — adds `test_gpt_5_6_mantle_model_metadata`
and extends `test_builtin_mantle_models_use_responses_protocol`; all
pass.
- `cargo test -p language_models mantle` — the consumer crate compiles
and all Mantle tests pass.
- `./script/clippy -p bedrock` passes with no new warnings; docs pass
`prettier --check`.

## Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments — N/A, no unsafe
code
- [x] The content adheres to Zed's UI standards — N/A, no UI change
- [x] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

---

Release Notes:

- Added GPT-5.6 Sol, Terra, and Luna models to the Amazon Bedrock
provider via the `bedrock-mantle` endpoint.

---------

Co-authored-by: Anant Goel <anant@zed.dev>