provider: split Bedrock Claude into 200K and 1M catalog entries

[jackmazac]

Summary

Amazon Bedrock exposes several Claude models that can use a very large context window, but only when you opt in with the right headers and product choice. Today those models often appear as a single option, which makes it easy to pick the wrong one or miss the beta header entirely. This change splits each supported Bedrock Claude model into a clear 200K default and a separate 1M variant so people can choose deliberately.

Problem (plain language)

Users want either “normal” long context or the experimental million-token mode. When both behaviors share one catalog entry, the app cannot label limits honestly, and the wrong beta flag may be attached—or omitted—so requests fail or behave unexpectedly. Native 1M support on newer models must not be forced through the older beta path.

Technical breakdown

1. Models.dev / custom provider ingestion builds a flat map of Bedrock models in fromModelsDevProvider.
2. Specific Claude Opus/Sonnet API ids support a 1M context with header context-1m-2025-08-07, while the same logical model should still be available at 200K without that beta.
3. Opus 4.7 is treated as native 1M: keep existing anthropicBeta from upstream data instead of injecting the 1M beta on the 1M row.

Solution

• Add splitBedrock1m for provider id amazon-bedrock: for matching model.api.id substrings, clone into a -1m model id.
• Base row: cap context at 200K, strip anthropicBeta from options, normalize display name to (200K).
• -1m row: 1M context; merge beta array—native Opus 4.7 keeps existing betas only; others add the 1M beta when missing.

Files

• packages/opencode/src/provider/provider.ts

How to test

From packages/opencode:

bun typecheck

Manual: open model picker for Bedrock and confirm paired (200K) / (1M) entries for supported Claude ids.

Merge order

Independent of PR #25184 and PR #25185. Recommended before or with any Bedrock transform follow-up that assumes distinct -1m ids.

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[jackmazac]

Closing to reopen with a linked issue and the repo PR template per CONTRIBUTING.