fix: support OpenAI Compatible provider for reasoning models

Author: qiosun

packages/opencode/src/provider/provider.ts

@@ -792,11 +792,10 @@ export namespace Provider {
         }
 
         // Reasoning models require max_completion_tokens instead of max_tokens
-        // when using openai-compatible provider
-        // Check if model has reasoning capability OR has reasoningEffort option
-        const isReasoningModel =
-          model.capabilities.reasoning || (model.options && "reasoningEffort" in model.options)
-        if (model.api.npm === "@ai-sdk/azure" && isReasoningModel) {
+        // when using openai-compatible or azure provider
+        const isOpenAICompatible =
+          model.api.npm === "@ai-sdk/openai-compatible" || model.api.npm === "@ai-sdk/azure"
+        if (isOpenAICompatible && model.capabilities.reasoning) {
           if (opts.body && typeof opts.body === "string") {
             try {
               const body = JSON.parse(opts.body)
@@ -806,7 +805,11 @@ export namespace Provider {
                 opts.body = JSON.stringify(body)
               }
             } catch (e) {
-              // Ignore JSON parse errors
+              log.warn("Failed to transform max_tokens parameter for reasoning model", {
+                providerID: model.providerID,
+                modelID: model.id,
+                error: e,
+              })
             }
           }
         }