fix(opencode): route SAP AI Core reasoning variants through modelParams (anomalyco#30482)

Author: jerome-benoit

.gitignore

@@ -15,6 +15,8 @@ ts-dist
 .turbo
 **/.serena
 .serena/
+**/.omo
+.omo/
 /result
 refs
 Session.vim

packages/opencode/src/provider/transform.ts

@@ -611,6 +611,32 @@ function googleThinkingBudgetMax(apiId: string) {
   return 24_576
 }
 
+// SAP's Zod schema drops unknown top-level keys; reasoning controls survive
+// only via `modelParams` (catchall), forwarded verbatim by the SAP SDKs.
+function wrapInSapModelParams(
+  variants: Record<string, Record<string, any>>,
+): Record<string, Record<string, any>> {
+  return Object.fromEntries(Object.entries(variants).map(([k, v]) => [k, { modelParams: v }]))
+}
+
+function googleThinkingVariants(model: Provider.Model): Record<string, Record<string, any>> {
+  const id = model.api.id.toLowerCase()
+  if (id.includes("2.5")) {
+    return {
+      high: { thinkingConfig: { includeThoughts: true, thinkingBudget: 16000 } },
+      max: {
+        thinkingConfig: { includeThoughts: true, thinkingBudget: googleThinkingBudgetMax(id) },
+      },
+    }
+  }
+  return Object.fromEntries(
+    googleThinkingLevelEfforts(id).map((effort) => [
+      effort,
+      { thinkingConfig: { includeThoughts: true, thinkingLevel: effort } },
+    ]),
+  )
+}
+
 export function variants(model: Provider.Model): Record<string, Record<string, any>> {
   if (!model.capabilities.reasoning) return {}
 
@@ -716,7 +742,7 @@ export function variants(model: Provider.Model): Record<string, Record<string, a
             max: {
               thinkingConfig: {
                 includeThoughts: true,
-                thinkingBudget: 24576,
+                thinkingBudget: googleThinkingBudgetMax(id),
               },
             },
           }
@@ -903,34 +929,7 @@ export function variants(model: Provider.Model): Record<string, Record<string, a
     // https://v5.ai-sdk.dev/providers/ai-sdk-providers/google-vertex
     case "@ai-sdk/google":
       // https://v5.ai-sdk.dev/providers/ai-sdk-providers/google-generative-ai
-      if (id.includes("2.5")) {
-        return {
-          high: {
-            thinkingConfig: {
-              includeThoughts: true,
-              thinkingBudget: 16000,
-            },
-          },
-          max: {
-            thinkingConfig: {
-              includeThoughts: true,
-              thinkingBudget: googleThinkingBudgetMax(id),
-            },
-          },
-        }
-      }
-
-      return Object.fromEntries(
-        googleThinkingLevelEfforts(id).map((effort) => [
-          effort,
-          {
-            thinkingConfig: {
-              includeThoughts: true,
-              thinkingLevel: effort,
-            },
-          },
-        ]),
-      )
+      return googleThinkingVariants(model)
 
     case "@ai-sdk/mistral":
       // https://v5.ai-sdk.dev/providers/ai-sdk-providers/mistral
@@ -969,57 +968,43 @@ export function variants(model: Provider.Model): Record<string, Record<string, a
       // https://v5.ai-sdk.dev/providers/ai-sdk-providers/perplexity
       return {}
 
-    case "@jerome-benoit/sap-ai-provider-v2":
-      if (model.api.id.includes("anthropic")) {
+    case "@jerome-benoit/sap-ai-provider-v2": {
+      if (id.includes("anthropic")) {
         if (adaptiveEfforts) {
-          return Object.fromEntries(
-            adaptiveEfforts.map((effort) => [
-              effort,
-              {
-                thinking: {
-                  type: "adaptive",
-                  ...(adaptiveOpus ? { display: "summarized" } : {}),
-                },
+          // Bedrock adaptive splits `effort` out into `output_config` (vs Anthropic
+          // native which inlines it). Opus 4.7+ flipped `display` default to "omitted".
+          return wrapInSapModelParams(
+            Object.fromEntries(
+              adaptiveEfforts.map((effort) => [
                 effort,
-              },
-            ]),
+                {
+                  thinking: { type: "adaptive", ...(adaptiveOpus ? { display: "summarized" } : {}) },
+                  output_config: { effort },
+                },
+              ]),
+            ),
           )
         }
-        return {
-          high: {
-            thinking: {
-              type: "enabled",
-              budgetTokens: 16000,
-            },
-          },
-          max: {
-            thinking: {
-              type: "enabled",
-              budgetTokens: 31999,
-            },
-          },
-        }
+        return wrapInSapModelParams({
+          high: { thinking: { type: "enabled", budget_tokens: 16000 } },
+          max: { thinking: { type: "enabled", budget_tokens: 31999 } },
+        })
       }
-      if (model.api.id.includes("gemini") && id.includes("2.5")) {
-        return {
-          high: {
-            thinkingConfig: {
-              includeThoughts: true,
-              thinkingBudget: 16000,
-            },
-          },
-          max: {
-            thinkingConfig: {
-              includeThoughts: true,
-              thinkingBudget: 24576,
-            },
-          },
-        }
+      if (id.includes("gemini") && id.includes("2.5")) {
+        return wrapInSapModelParams(googleThinkingVariants(model))
       }
-      if (model.api.id.includes("gpt") || /\bo[1-9]/.test(model.api.id)) {
-        return Object.fromEntries(WIDELY_SUPPORTED_EFFORTS.map((effort) => [effort, { reasoningEffort: effort }]))
+      if (id.includes("gpt") || /\bo[1-9]/.test(id)) {
+        const efforts = openaiReasoningEfforts(id, model.release_date)
+        return wrapInSapModelParams(
+          Object.fromEntries(efforts.map((effort) => [effort, { reasoning_effort: effort }])),
+        )
       }
-      return {}
+      return wrapInSapModelParams(
+        Object.fromEntries(
+          ["low", "medium", "high"].map((effort) => [effort, { reasoning_effort: effort }]),
+        ),
+      )
+    }
   }
   return {}
 }

packages/opencode/test/provider/transform.test.ts

@@ -3504,7 +3504,7 @@ describe("ProviderTransform.variants", () => {
   })
 
   describe("@jerome-benoit/sap-ai-provider-v2", () => {
-    const sapModel = (apiId: string) =>
+    const sapModel = (apiId: string, releaseDate = "2024-01-01") =>
       createMockModel({
         id: `sap-ai-core/${apiId}`,
         providerID: "sap-ai-core",
@@ -3513,78 +3513,110 @@ describe("ProviderTransform.variants", () => {
           url: "https://api.ai.sap",
           npm: "@jerome-benoit/sap-ai-provider-v2",
         },
+        release_date: releaseDate,
       })
 
     for (const testCase of [
       {
         name: "sonnet 4.6",
         apiIds: ["anthropic--claude-sonnet-4-6"],
         efforts: ["low", "medium", "high", "max"],
-        expectedHigh: { thinking: { type: "adaptive" }, effort: "high" },
+        thinking: { type: "adaptive" },
       },
       {
         name: "opus 4.6",
         apiIds: ["anthropic--claude-4.6-opus", "anthropic--claude-4-6-opus"],
         efforts: ["low", "medium", "high", "max"],
-        expectedHigh: { thinking: { type: "adaptive" }, effort: "high" },
+        thinking: { type: "adaptive" },
       },
       {
         name: "opus 4.7",
         apiIds: ["anthropic--claude-4.7-opus", "anthropic--claude-4-7-opus"],
         efforts: ["low", "medium", "high", "xhigh", "max"],
-        expectedHigh: { thinking: { type: "adaptive", display: "summarized" }, effort: "high" },
+        thinking: { type: "adaptive", display: "summarized" },
       },
       {
         name: "opus 4.8",
         apiIds: ["anthropic--claude-4.8-opus", "anthropic--claude-4-8-opus"],
         efforts: ["low", "medium", "high", "xhigh", "max"],
-        expectedHigh: { thinking: { type: "adaptive", display: "summarized" }, effort: "high" },
+        thinking: { type: "adaptive", display: "summarized" },
       },
     ]) {
       for (const apiId of testCase.apiIds) {
-        test(`${testCase.name} ${apiId} returns adaptive thinking variants`, () => {
+        test(`${testCase.name} ${apiId} returns adaptive thinking variants under modelParams`, () => {
           const result = ProviderTransform.variants(sapModel(apiId))
           expect(Object.keys(result)).toEqual(testCase.efforts)
-          expect(result.high).toEqual(testCase.expectedHigh)
-          if (testCase.efforts.includes("xhigh")) {
-            expect(result.xhigh).toEqual({ ...testCase.expectedHigh, effort: "xhigh" })
+          for (const effort of testCase.efforts) {
+            expect(result[effort]).toEqual({
+              modelParams: {
+                thinking: testCase.thinking,
+                output_config: { effort },
+              },
+            })
           }
         })
       }
     }
 
-    test("anthropic sonnet 4 returns budget-tokens variants", () => {
-      const result = ProviderTransform.variants(sapModel("anthropic--claude-sonnet-4"))
-      expect(Object.keys(result)).toEqual(["high", "max"])
-      expect(result.high).toEqual({ thinking: { type: "enabled", budgetTokens: 16000 } })
-      expect(result.max).toEqual({ thinking: { type: "enabled", budgetTokens: 31999 } })
-    })
-
-    test("gemini 2.5 returns thinkingConfig variants", () => {
-      const result = ProviderTransform.variants(sapModel("gcp--gemini-2.5-pro"))
-      expect(Object.keys(result)).toEqual(["high", "max"])
-      expect(result.high).toEqual({ thinkingConfig: { includeThoughts: true, thinkingBudget: 16000 } })
-      expect(result.max).toEqual({ thinkingConfig: { includeThoughts: true, thinkingBudget: 24576 } })
-    })
-
-    for (const apiId of ["azure-openai--gpt-4o", "azure-openai--o3-mini"]) {
-      test(`${apiId} returns reasoningEffort variants`, () => {
+    for (const apiId of ["anthropic--claude-sonnet-4", "anthropic--claude-4.5-opus"]) {
+      test(`${apiId} returns budget_tokens variants under modelParams`, () => {
         const result = ProviderTransform.variants(sapModel(apiId))
-        expect(Object.keys(result)).toEqual(["low", "medium", "high"])
-        expect(result.low).toEqual({ reasoningEffort: "low" })
-        expect(result.high).toEqual({ reasoningEffort: "high" })
+        expect(Object.keys(result)).toEqual(["high", "max"])
+        expect(result.high).toEqual({
+          modelParams: { thinking: { type: "enabled", budget_tokens: 16000 } },
+        })
+        expect(result.max).toEqual({
+          modelParams: { thinking: { type: "enabled", budget_tokens: 31999 } },
+        })
       })
     }
 
-    for (const apiId of ["perplexity--sonar-pro", "mistral--mistral-large"]) {
-      test(`${apiId} returns empty object`, () => {
-        expect(ProviderTransform.variants(sapModel(apiId))).toEqual({})
+    for (const testCase of [
+      { apiId: "gemini-2.5-pro", maxBudget: 32768 },
+      { apiId: "gemini-2.5-flash", maxBudget: 24576 },
+    ]) {
+      test(`${testCase.apiId} returns thinkingConfig variants under modelParams`, () => {
+        const result = ProviderTransform.variants(sapModel(testCase.apiId))
+        expect(Object.keys(result)).toEqual(["high", "max"])
+        expect(result.high).toEqual({
+          modelParams: { thinkingConfig: { includeThoughts: true, thinkingBudget: 16000 } },
+        })
+        expect(result.max).toEqual({
+          modelParams: { thinkingConfig: { includeThoughts: true, thinkingBudget: testCase.maxBudget } },
+        })
       })
     }
 
-    test("non-anthropic models with opus-like substrings do not get adaptive thinking", () => {
-      expect(ProviderTransform.variants(sapModel("aws--llama-opus-4.7-fake"))).toEqual({})
-    })
+    for (const testCase of [
+      { apiId: "gpt-5", releaseDate: "2025-08-07", efforts: ["minimal", "low", "medium", "high"] },
+      { apiId: "gpt-5-mini", releaseDate: "2025-08-07", efforts: ["minimal", "low", "medium", "high"] },
+      { apiId: "gpt-5-nano", releaseDate: "2025-08-07", efforts: ["minimal", "low", "medium", "high"] },
+      { apiId: "gpt-5.4", releaseDate: "2026-01-15", efforts: ["none", "low", "medium", "high", "xhigh"] },
+      { apiId: "azure-openai--o3-mini", releaseDate: "2024-01-01", efforts: ["low", "medium", "high"] },
+    ]) {
+      test(`${testCase.apiId} returns reasoning_effort variants under modelParams`, () => {
+        const result = ProviderTransform.variants(sapModel(testCase.apiId, testCase.releaseDate))
+        expect(Object.keys(result)).toEqual(testCase.efforts)
+        for (const effort of testCase.efforts) {
+          expect(result[effort]).toEqual({ modelParams: { reasoning_effort: effort } })
+        }
+      })
+    }
+
+    for (const apiId of [
+      "gemini-3.1-flash-lite",
+      "cohere--command-a-reasoning",
+      "sonar-deep-research",
+      "aws--llama-opus-4.7-fake",
+    ]) {
+      test(`${apiId} falls through to harmonized reasoning_effort fallback`, () => {
+        const result = ProviderTransform.variants(sapModel(apiId))
+        expect(Object.keys(result)).toEqual(["low", "medium", "high"])
+        for (const effort of ["low", "medium", "high"]) {
+          expect(result[effort]).toEqual({ modelParams: { reasoning_effort: effort } })
+        }
+      })
+    }
   })
 
   describe("ai-gateway-provider (cloudflare-ai-gateway)", () => {