reasoningToggle() returns {} for @ai-sdk/openai-compatible despite models.dev declaring a toggle (GLM 4.7, GLM 5-turbo)

Description

Problem

GLM 4.7 and GLM 5-turbo (zai-coding-plan) declare reasoning_options: [{"type": "toggle"}] on models.dev, but reasoningToggle() in packages/opencode/src/provider/transform.ts only handles @ai-sdk/alibaba and @ai-sdk/cohere. It returns {} for @ai-sdk/openai-compatible. No reasoning variants appear in the /models menu, so thinking can't be disabled for these models.

Aware of #18598 (closed as intentional). That decision predated the metadata-driven variant system (#36624, #36543, #37519), under which models.dev now declares a toggle for these models, but the new code path can't serve it for this transport. Flagging the inconsistency rather than relitigating the old behavior. If the metadata is wrong instead, that'd be good to know too.

Verification

Against the Z.AI coding plan endpoint, glm-4.7, same prompt:

• thinking: {"type": "disabled"} → reasoning_content empty, correct answer
• default → 269 chars of reasoning_content, correct answer

The API honors the toggle. Only the menu variants are missing.

Suggested fix

case "@ai-sdk/openai-compatible":
  return {
    none: { thinking: { type: "disabled" } },
    high: { thinking: { type: "enabled" } },
  }

Metadata-gated (only called when models.dev declares a toggle), fix is similar to the MiniMax M3 variants from #38330. Happy to send a PR with test.each coverage if the approach looks right.

Plugins

No response

OpenCode version

1.18.18

Steps to reproduce

1. Authenticate zai-coding-plan
2. /models → GLM 4.7
3. No reasoning variants offered (thinking can't be disabled)

Screenshot and/or share link

No response

Operating System

macOS 15.6.1

Terminal

No response