Danny Kopping 07c24d6021 docs: document OpenCode custom models through Bedrock Mantle (#29734)
Document OpenCode custom model IDs through an AI Gateway Bedrock Mantle
provider. Explain Coder token authentication, model aliases, optional
default/small-model selection, and SDK selection for Responses, Chat
Completions, and Anthropic Messages.

<details>
<summary>Configuration context and verification</summary>

Based on a working Astra configuration supplied and live-tested by
@dannykopping. Keep Astra as a concrete example while using
vendor-neutral provider naming and instructions. Use `coder.example.com`
and `bedrock-provider-name` as placeholders and omit unrelated MCP
configuration. Readers must substitute an available model ID and select
the matching SDK package.

Gateway routes and model routing were checked against the
implementation, and OpenCode settings against its documentation/schema.
Local Markdown/table checks, Vale, JSON parsing, and repository
lightweight pre-commit checks passed. The agent did not repeat the live
AWS request; OpenCode is not installed in this workspace.

</details>

Generated by Coder Agents on behalf of @dannykopping.
2026-09-23 07:03:28 +01:00
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