fix(opencode): remove model ID blocklist from reasoning variants

[elonazoulay]

Issue for this PR

Closes #23334

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Removes the hardcoded model ID blocklist from variants() in transform.ts. Instead of excluding models by name (deepseek, glm, minimax, mistral, kimi, qwen, etc.), reasoning effort variants are now gated solely by capabilities.reasoning from models.dev.

Verified that z-ai (GLM-5.1), DeepSeek, and Fireworks all support reasoning_effort through their openai-compatible APIs.

How did you verify your code works?

From packages/opencode:

• bun test test/provider/transform.test.ts
• bun typecheck

Added focused coverage for:

• deepseek with reasoning: true on @ai-sdk/openai-compatible returning low / medium / high
• deepseek with reasoning: false returning {}
• glm with reasoning: true on @ai-sdk/openai-compatible returning low / medium / high
• mistral on @ai-sdk/mistral returning {} (handled by provider switch)

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[rekram1-node]

hm there is no restore? They have always been omitted since none of the models support reasoning efforts as far as I know, may have changed for some models

[elonazoulay]

hm there is no restore? They have always been omitted since none of the models support reasoning efforts as far as I know, may have changed for some models

Hey, thanks for taking a look at this pr!
I am testing it locally, could be that it is a recent change, I verified that zai, deepseek and fireworks all support reasoning. And the difference is amazing when using this locally.

opencode is the best!

Either way, lmk if this is good or any changes needed. Much appreciated!

[rekram1-node]

I verified that zai, deepseek and fireworks all support reasoning.

How did u verify this? From what I read on their docs reasoning effort doesnt do anything for zai or deepseek models regardless of if the api allows them