fix(opencode): defer reasoning variant migration

packages/opencode/src/provider/provider.ts

@@ -1250,11 +1250,9 @@ function fromModelsDevModel(provider: ModelsDev.Provider, model: ModelsDev.Model
     variants: {},
   }
 
-  const variants = ProviderTransform.reasoningVariants(model, base) ?? ProviderTransform.variants(base)
-
   return {
     ...base,
-    variants: mapValues(variants, (v) => v),
+    variants: mapValues(ProviderTransform.variants(base), (v) => v),
   }
 }
 
@@ -1510,11 +1508,7 @@ const layer = Layer.effect(
               release_date: model.release_date ?? existingModel?.release_date ?? "",
               variants: {},
             }
-            const variants =
-              existingModel?.api.npm === parsedModel.api.npm
-                ? (existingModel.variants ?? ProviderTransform.variants(parsedModel))
-                : ProviderTransform.variants(parsedModel)
-            const merged = mergeDeep(variants, model.variants ?? {})
+            const merged = mergeDeep(ProviderTransform.variants(parsedModel), model.variants ?? {})
             parsedModel.variants = mapValues(
               pickBy(merged, (v) => !v.disabled),
               (v) => omit(v, ["disabled"]),
@@ -1645,7 +1639,7 @@ const layer = Layer.effect(
             )
               delete provider.models[modelID]
 
-            if (model.variants === undefined) {
+            if (!model.variants || Object.keys(model.variants).length === 0) {
               model.variants = mapValues(ProviderTransform.variants(model), (v) => v)
             }
 

packages/opencode/src/provider/transform.ts

@@ -1582,185 +1582,4 @@ export function schema(model: Provider.Model, schema: JSONSchema7): JSONSchema7
   return schema
 }
 
-export function reasoningVariants(model: ModelsDev.Model, target: Provider.Model): Provider.Model["variants"] {
-  const options = model.reasoning_options
-  if (options === undefined) return
-  if (options.length === 0) return {}
-
-  const effort = options.find((option) => option.type === "effort")
-  if (effort) return nonEmptyVariants(effortVariants(target, effort.values))
-
-  const toggle = options.some((option) => option.type === "toggle")
-  const budget = options.find((option) => option.type === "budget_tokens")
-  if (!budget) return toggle ? nonEmptyVariants(reasoningToggle(target)) : undefined
-
-  return nonEmptyVariants({
-    ...(toggle ? reasoningToggle(target) : {}),
-    ...budgetVariants(target, budget.min, budget.max),
-  })
-}
-
-function effortVariants(model: Provider.Model, values: readonly unknown[]) {
-  return Object.fromEntries(
-    values.flatMap((value) => {
-      const id = (() => {
-        if (value === null) return "none"
-        if (typeof value === "string") return value
-      })()
-      if (id === undefined) return []
-      const settings = reasoningEffort(model, id)
-      return settings ? [[id, settings]] : []
-    }),
-  )
-}
-
-function budgetVariants(model: Provider.Model, min?: number, max?: number) {
-  const maximum = Math.min(max ?? OUTPUT_TOKEN_MAX - 1, model.limit.output - 1, OUTPUT_TOKEN_MAX - 1)
-  if (maximum <= 0) return {}
-  const high = Math.min(Math.max(min ?? 0, Math.floor((maximum + 1) / 2)), maximum)
-  return Object.fromEntries(
-    [
-      { id: "high", budget: high },
-      { id: "max", budget: maximum },
-    ].flatMap((item) => {
-      const settings = reasoningBudget(model, item.budget)
-      return settings ? [[item.id, settings]] : []
-    }),
-  )
-}
-
-function nonEmptyVariants(variants: NonNullable<Provider.Model["variants"]>): Provider.Model["variants"] {
-  return Object.keys(variants).length > 0 ? variants : undefined
-}
-
-function reasoningToggle(model: Provider.Model): NonNullable<Provider.Model["variants"]> {
-  if (model.api.npm === "@ai-sdk/alibaba")
-    return {
-      none: { enableThinking: false },
-      high: { enableThinking: true },
-    }
-  if (model.api.npm === "@ai-sdk/cohere")
-    return {
-      none: { thinking: { type: "disabled" } },
-      high: { thinking: { type: "enabled" } },
-    }
-  return {}
-}
-
-function reasoningEffort(model: Provider.Model, effort: string) {
-  switch (model.api.npm) {
-    case "@openrouter/ai-sdk-provider":
-      return { reasoning: { effort } }
-    case "@ai-sdk/anthropic":
-    case "@ai-sdk/google-vertex/anthropic":
-      return anthropicEffort(model, effort)
-    case "@ai-sdk/google":
-    case "@ai-sdk/google-vertex":
-      return { thinkingConfig: { includeThoughts: true, thinkingLevel: effort } }
-    case "@ai-sdk/amazon-bedrock":
-      if (anthropicAdaptiveEfforts(model.api.id))
-        return {
-          reasoningConfig: {
-            type: "adaptive",
-            maxReasoningEffort: effort,
-            ...(anthropicOmitsThinking(model.api.id) ? { display: "summarized" } : {}),
-          },
-        }
-      if (model.api.id.includes("anthropic")) return
-      return { reasoningConfig: { type: "enabled", maxReasoningEffort: effort } }
-    case "@ai-sdk/gateway":
-      if (model.id.includes("anthropic")) return { thinking: { type: "adaptive", display: "summarized" }, effort }
-      if (model.id.includes("google")) return { thinkingConfig: { includeThoughts: true, thinkingLevel: effort } }
-      return { reasoningEffort: effort }
-    case "@ai-sdk/github-copilot":
-      // OAuth discovery replaces these with variants from Copilot's /models capabilities.
-      if (model.id.includes("gemini")) return
-      if (model.id.includes("claude")) return { reasoningEffort: effort }
-      return { reasoningEffort: effort, reasoningSummary: "auto", include: INCLUDE_ENCRYPTED_REASONING }
-    case "@ai-sdk/openai":
-    case "@ai-sdk/amazon-bedrock/mantle":
-      return { reasoningEffort: effort, reasoningSummary: "auto", include: INCLUDE_ENCRYPTED_REASONING }
-    case "@ai-sdk/azure":
-      return { reasoningEffort: effort, reasoningSummary: "auto", include: INCLUDE_ENCRYPTED_REASONING }
-    case "@jerome-benoit/sap-ai-provider-v2":
-      if (model.id.includes("anthropic"))
-        return { modelParams: { thinking: { type: "adaptive", display: "summarized" }, output_config: { effort } } }
-      return { modelParams: { reasoning_effort: effort } }
-    case "@ai-sdk/openai-compatible":
-    case "@ai-sdk/xai":
-    case "@ai-sdk/mistral":
-    case "@ai-sdk/groq":
-    case "@ai-sdk/cerebras":
-    case "@ai-sdk/deepinfra":
-    case "@ai-sdk/togetherai":
-    case "venice-ai-sdk-provider":
-    case "ai-gateway-provider":
-      return { reasoningEffort: effort }
-    case "@ai-sdk/cohere":
-    case "@ai-sdk/perplexity":
-    case "@ai-sdk/vercel":
-    case "@ai-sdk/alibaba":
-    case "gitlab-ai-provider":
-      return
-  }
-}
-
-function anthropicEffort(model: Provider.Model, effort: string) {
-  if (["opus-4-5", "opus-4.5"].some((value) => model.api.id.includes(value))) return { effort }
-  if (!anthropicAdaptiveEfforts(model.api.id)) return
-  return {
-    thinking: {
-      type: "adaptive",
-      ...(anthropicOmitsThinking(model.api.id) ? { display: "summarized" } : {}),
-    },
-    effort,
-  }
-}
-
-function reasoningBudget(model: Provider.Model, budget: number) {
-  switch (model.api.npm) {
-    case "@openrouter/ai-sdk-provider":
-      return { reasoning: { max_tokens: budget } }
-    case "@ai-sdk/anthropic":
-    case "@ai-sdk/google-vertex/anthropic":
-      return { thinking: { type: "enabled", budgetTokens: budget } }
-    case "@ai-sdk/google":
-    case "@ai-sdk/google-vertex":
-      return { thinkingConfig: { includeThoughts: true, thinkingBudget: budget } }
-    case "@ai-sdk/amazon-bedrock":
-      return { reasoningConfig: { type: "enabled", budgetTokens: budget } }
-    case "@ai-sdk/gateway":
-      if (model.id.includes("anthropic")) return { thinking: { type: "enabled", budgetTokens: budget } }
-      if (model.id.includes("google")) return { thinkingConfig: { includeThoughts: true, thinkingBudget: budget } }
-      return
-    case "@ai-sdk/cohere":
-      return { thinking: { type: "enabled", tokenBudget: budget } }
-    case "@ai-sdk/alibaba":
-      return { enableThinking: true, thinkingBudget: budget }
-    case "@jerome-benoit/sap-ai-provider-v2":
-      if (model.id.includes("anthropic"))
-        return { modelParams: { thinking: { type: "enabled", budget_tokens: budget } } }
-      if (model.id.includes("gemini"))
-        return { modelParams: { thinkingConfig: { includeThoughts: true, thinkingBudget: budget } } }
-      return
-    case "@ai-sdk/amazon-bedrock/mantle":
-    case "@ai-sdk/azure":
-    case "@ai-sdk/cerebras":
-    case "@ai-sdk/deepinfra":
-    case "@ai-sdk/github-copilot":
-    case "@ai-sdk/groq":
-    case "@ai-sdk/mistral":
-    case "@ai-sdk/openai":
-    case "@ai-sdk/openai-compatible":
-    case "@ai-sdk/perplexity":
-    case "@ai-sdk/togetherai":
-    case "@ai-sdk/vercel":
-    case "@ai-sdk/xai":
-    case "ai-gateway-provider":
-    case "gitlab-ai-provider":
-    case "venice-ai-sdk-provider":
-      return
-  }
-}
-
 export * as ProviderTransform from "./transform"