diff --git a/apps/web/src/app/api/openrouter/[...path]/route.test.ts b/apps/web/src/app/api/openrouter/[...path]/route.test.ts
index c41f559eb3..93696bb624 100644
--- a/apps/web/src/app/api/openrouter/[...path]/route.test.ts
+++ b/apps/web/src/app/api/openrouter/[...path]/route.test.ts
@@ -134,6 +134,7 @@ const provider = {
   apiUrl: 'https://openrouter.ai/api/v1',
   apiKey: 'test-key',
   supportedChatApis: ['chat_completions', 'responses', 'messages'],
+  responseTransforms: null,
   transformRequest: jest.fn(),
 } satisfies Provider;
 
@@ -291,7 +292,31 @@ describe('POST /api/openrouter/v1/chat/completions rules-engine actions', () =>
       expect.anything(),
       expect.anything(),
       expect.anything(),
-      expect.objectContaining({ vercel_request_id: 'iad1::iad1::request-id' })
+      expect.objectContaining({ vercel_request_id: 'iad1::iad1::request-id' }),
+      null
+    );
+  });
+
+  it('passes provider response transforms to the response rewriter', async () => {
+    const responseTransforms = { thoughtContentMapping: 'extra_content.flags.thought' };
+    mockedGetProvider.mockResolvedValue({
+      kind: 'provider',
+      provider: { ...provider, responseTransforms },
+      userByok: null,
+      bypassAccessCheck: false,
+    });
+    const { POST } = await import('./route');
+
+    const response = await POST(makeRequest(makeBody()) as never);
+
+    expect(response.status).toBe(200);
+    expect(mockedRewriteModelResponse).toHaveBeenCalledWith(
+      expect.anything(),
+      expect.anything(),
+      expect.anything(),
+      expect.anything(),
+      expect.anything(),
+      responseTransforms
     );
   });
 
diff --git a/apps/web/src/app/api/openrouter/[...path]/route.ts b/apps/web/src/app/api/openrouter/[...path]/route.ts
index 2441650c63..de892013dd 100644
--- a/apps/web/src/app/api/openrouter/[...path]/route.ts
+++ b/apps/web/src/app/api/openrouter/[...path]/route.ts
@@ -1039,6 +1039,7 @@ export async function POST(request: NextRequest): Promise<NextResponseType<unkno
     effectiveModelIdLowerCased,
     effectiveProviderContext.provider.id,
     requestBodyParsed.kind,
-    requestLogging
+    requestLogging,
+    effectiveProviderContext.provider.responseTransforms
   );
 }
diff --git a/apps/web/src/lib/ai-gateway/experiments/build-direct-provider.test.ts b/apps/web/src/lib/ai-gateway/experiments/build-direct-provider.test.ts
index c8fe7a0e88..fe5cf5a157 100644
--- a/apps/web/src/lib/ai-gateway/experiments/build-direct-provider.test.ts
+++ b/apps/web/src/lib/ai-gateway/experiments/build-direct-provider.test.ts
@@ -91,6 +91,56 @@ describe('custom LLM thought signature mapping configuration', () => {
   );
 });
 
+describe('custom LLM thought content mapping configuration', () => {
+  const config = {
+    internal_id: 'upstream-model',
+    base_url: 'https://llm.example.com/v1',
+  };
+
+  it('accepts a dot-separated property path', () => {
+    expect(
+      CustomLlmApiConfigSchema.safeParse({
+        ...config,
+        thought_content_mapping: 'extra_content.flags.thought',
+      }).success
+    ).toBe(true);
+  });
+
+  it.each(['', 'extra_content..thought', 'constructor.prototype.thought'])(
+    'rejects unsafe property path %p',
+    thought_content_mapping => {
+      expect(
+        CustomLlmApiConfigSchema.safeParse({ ...config, thought_content_mapping }).success
+      ).toBe(false);
+    }
+  );
+});
+
+describe('buildDirectProvider response transforms', () => {
+  it('exposes the thought content property path without other upstream configuration', () => {
+    const provider = buildDirectProvider('custom', ['chat_completions'], {
+      internal_id: 'upstream-model',
+      base_url: 'https://llm.example.com/v1',
+      api_key: 'test-key',
+      thought_content_mapping: 'extra_content.flags.thought',
+    });
+
+    expect(provider.responseTransforms).toEqual({
+      thoughtContentMapping: 'extra_content.flags.thought',
+    });
+  });
+
+  it('sets response transforms to null when no mapping is configured', () => {
+    const provider = buildDirectProvider('custom', ['chat_completions'], {
+      internal_id: 'upstream-model',
+      base_url: 'https://llm.example.com/v1',
+      api_key: 'test-key',
+    });
+
+    expect(provider.responseTransforms).toBeNull();
+  });
+});
+
 describe('buildDirectProvider thought signature mapping', () => {
   it('maps assistant tool-call signatures and removes camel-case transport fields', async () => {
     const request = makeRequest();
diff --git a/apps/web/src/lib/ai-gateway/experiments/build-direct-provider.ts b/apps/web/src/lib/ai-gateway/experiments/build-direct-provider.ts
index 0a73488fd3..74a8696b0f 100644
--- a/apps/web/src/lib/ai-gateway/experiments/build-direct-provider.ts
+++ b/apps/web/src/lib/ai-gateway/experiments/build-direct-provider.ts
@@ -202,6 +202,9 @@ export function buildDirectProvider(
     apiUrl: upstream.base_url,
     apiKey: upstream.api_key,
     supportedChatApis,
+    responseTransforms: upstream.thought_content_mapping
+      ? { thoughtContentMapping: upstream.thought_content_mapping }
+      : null,
     async transformRequest(context) {
       if (upstream.remove_from_body) {
         const body = context.request.body as Record<string, unknown>;
diff --git a/apps/web/src/lib/ai-gateway/providers/get-provider.ts b/apps/web/src/lib/ai-gateway/providers/get-provider.ts
index 16f5e53fe3..5e814a16eb 100644
--- a/apps/web/src/lib/ai-gateway/providers/get-provider.ts
+++ b/apps/web/src/lib/ai-gateway/providers/get-provider.ts
@@ -80,6 +80,7 @@ async function checkDirectBYOK(
       apiUrl: directByok.base_url,
       apiKey: userByok[0].decryptedAPIKey,
       supportedChatApis: directByok.supported_chat_apis,
+      responseTransforms: null,
       async transformRequest(context) {
         context.request.body.model = directByokModel.id;
         directByok.transformRequest(context);
diff --git a/apps/web/src/lib/ai-gateway/providers/provider-definitions.ts b/apps/web/src/lib/ai-gateway/providers/provider-definitions.ts
index b151f2a5ae..559350b9ee 100644
--- a/apps/web/src/lib/ai-gateway/providers/provider-definitions.ts
+++ b/apps/web/src/lib/ai-gateway/providers/provider-definitions.ts
@@ -9,6 +9,7 @@ export default {
     apiUrl: 'https://openrouter.ai/api/v1',
     apiKey: getEnvVariable('OPENROUTER_API_KEY'),
     supportedChatApis: ['chat_completions', 'messages', 'responses'],
+    responseTransforms: null,
     async transformRequest() {},
   },
   ALIBABA: {
@@ -17,6 +18,7 @@ export default {
     apiKey: getEnvVariable('ALIBABA_API_KEY'),
     // Prompt caching is not supported on the responses API for Alibaba; enabling it is therefore dangerous.
     supportedChatApis: ['chat_completions' /*, 'responses'*/],
+    responseTransforms: null,
     async transformRequest(context) {
       context.request.body.enable_thinking = !isReasoningExplicitlyDisabled(context.request);
     },
@@ -27,6 +29,7 @@ export default {
     apiKey: getEnvVariable('BYTEDANCE_API_KEY'),
     // Prompt caching is not supported on the responses API for Bytedance; enabling it is therefore dangerous.
     supportedChatApis: ['chat_completions' /*, 'responses'*/],
+    responseTransforms: null,
     async transformRequest(context) {
       if (!isReasoningExplicitlyDisabled(context.request)) {
         context.request.body.thinking = { type: 'enabled' };
@@ -49,6 +52,7 @@ export default {
     apiUrl: 'https://api.withmartian.com/v1',
     apiKey: getEnvVariable('MARTIAN_API_KEY'),
     supportedChatApis: ['chat_completions', 'responses', 'messages'],
+    responseTransforms: null,
     async transformRequest(context) {
       delete context.request.body.provider;
     },
@@ -58,6 +62,7 @@ export default {
     apiUrl: 'https://api.mistral.ai/v1',
     apiKey: getEnvVariable('MISTRAL_API_KEY'),
     supportedChatApis: [],
+    responseTransforms: null,
     async transformRequest() {},
   },
   STREAMLAKE: {
@@ -65,6 +70,7 @@ export default {
     apiUrl: 'https://vanchin.streamlake.ai/api/gateway/v1/endpoints',
     apiKey: getEnvVariable('STREAMLAKE_API_KEY'),
     supportedChatApis: ['chat_completions'],
+    responseTransforms: null,
     async transformRequest(context) {
       delete context.request.body.provider;
     },
@@ -74,6 +80,7 @@ export default {
     apiUrl: 'https://ai-gateway.vercel.sh/v1',
     apiKey: getEnvVariable('VERCEL_AI_GATEWAY_API_KEY'),
     supportedChatApis: ['chat_completions', 'messages', 'responses'],
+    responseTransforms: null,
     async transformRequest(context) {
       await applyVercelSettings(context.model, context.request, context.userByok);
     },
diff --git a/apps/web/src/lib/ai-gateway/providers/types.ts b/apps/web/src/lib/ai-gateway/providers/types.ts
index 58138eade9..c0e950cf31 100644
--- a/apps/web/src/lib/ai-gateway/providers/types.ts
+++ b/apps/web/src/lib/ai-gateway/providers/types.ts
@@ -35,10 +35,15 @@ export type TransformRequestContext = {
 
 export type GatewayChatApiKind = GatewayRequest['kind'];
 
+export type ProviderResponseTransforms = {
+  thoughtContentMapping: string | null;
+};
+
 export type Provider = {
   id: ProviderId;
   apiUrl: string;
   apiKey: string;
   supportedChatApis: ReadonlyArray<GatewayChatApiKind>;
+  responseTransforms: ProviderResponseTransforms | null;
   transformRequest(context: TransformRequestContext): Promise<void>;
 };
diff --git a/apps/web/src/lib/ai-gateway/providers/upstream-request.generation.test.ts b/apps/web/src/lib/ai-gateway/providers/upstream-request.generation.test.ts
index 9cd3b48437..1f27b36433 100644
--- a/apps/web/src/lib/ai-gateway/providers/upstream-request.generation.test.ts
+++ b/apps/web/src/lib/ai-gateway/providers/upstream-request.generation.test.ts
@@ -20,6 +20,7 @@ const provider: Provider = {
   apiUrl: 'https://openrouter.example/api/v1',
   apiKey: 'test-api-key',
   supportedChatApis: [],
+  responseTransforms: null,
   transformRequest: async () => {},
 };
 
diff --git a/apps/web/src/lib/rewriteModelResponse.test.ts b/apps/web/src/lib/rewriteModelResponse.test.ts
index 64826224e1..7a424d51fc 100644
--- a/apps/web/src/lib/rewriteModelResponse.test.ts
+++ b/apps/web/src/lib/rewriteModelResponse.test.ts
@@ -116,8 +116,15 @@ function dataObjects(sse: string): unknown[] {
     .map(payload => JSON.parse(payload));
 }
 
+const rewriteChatCompletionsWithoutTransforms: typeof rewriteModelResponse_Messages = (
+  response,
+  removeCost,
+  capture,
+  vercelRequestId
+) => rewriteModelResponse_ChatCompletions(response, removeCost, capture, vercelRequestId, null);
+
 const rewriters = [
-  ['Chat Completions', rewriteModelResponse_ChatCompletions],
+  ['Chat Completions', rewriteChatCompletionsWithoutTransforms],
   ['Messages', rewriteModelResponse_Messages],
   ['Responses', rewriteModelResponse_Responses],
 ] as const;
@@ -206,7 +213,7 @@ describe('rewriteModelResponse_ChatCompletions', () => {
         },
       });
 
-      const result = await rewriteModelResponse_ChatCompletions(upstream, true, null, null);
+      const result = await rewriteModelResponse_ChatCompletions(upstream, true, null, null, null);
       const json = await result.json();
 
       expect(json.model).toBe('upstream-model');
@@ -229,7 +236,7 @@ describe('rewriteModelResponse_ChatCompletions', () => {
         },
       });
 
-      const result = await rewriteModelResponse_ChatCompletions(upstream, true, null, null);
+      const result = await rewriteModelResponse_ChatCompletions(upstream, true, null, null, null);
       const json = await result.json();
 
       expect(json.usage.prompt_tokens_details.cached_tokens).toBe(0);
@@ -242,7 +249,7 @@ describe('rewriteModelResponse_ChatCompletions', () => {
         headers: { 'content-type': 'application/json' },
       });
 
-      const result = await rewriteModelResponse_ChatCompletions(upstream, true, null, null);
+      const result = await rewriteModelResponse_ChatCompletions(upstream, true, null, null, null);
 
       expect(result.status).toBe(502);
       expect(await result.text()).toBe('not-json{');
@@ -270,7 +277,7 @@ describe('rewriteModelResponse_ChatCompletions', () => {
       );
 
       try {
-        const result = await rewriteModelResponse_ChatCompletions(upstream, true, null, null);
+        const result = await rewriteModelResponse_ChatCompletions(upstream, true, null, null, null);
         const reader = result.body?.getReader();
         expect(reader).toBeDefined();
         await reader?.read();
@@ -295,7 +302,7 @@ describe('rewriteModelResponse_ChatCompletions', () => {
         'data: {"id":"gen-chat","model":"upstream-model","choices":[]}\n\n'
       );
 
-      const result = await rewriteModelResponse_ChatCompletions(upstream, true, null, null);
+      const result = await rewriteModelResponse_ChatCompletions(upstream, true, null, null, null);
       const sse = await readOutputStream(result);
       const events = dataObjects(sse) as Array<{ error?: { code: number; type: string } }>;
 
@@ -311,7 +318,7 @@ describe('rewriteModelResponse_ChatCompletions', () => {
           'data: [DONE]\n\n'
       );
 
-      const result = await rewriteModelResponse_ChatCompletions(upstream, true, null, null);
+      const result = await rewriteModelResponse_ChatCompletions(upstream, true, null, null, null);
       const sse = await readOutputStream(result);
       const [chunk] = dataObjects(sse) as Array<{
         model: string;
@@ -324,6 +331,27 @@ describe('rewriteModelResponse_ChatCompletions', () => {
       expect(dataPayloads(sse)).toContain('[DONE]');
     });
 
+    test('moves marked delta content to reasoning content', async () => {
+      const upstream = sseResponse(
+        'data: {"model":"upstream-model","choices":[{"index":0,"delta":{"content":"first thought","extra_content":{"flags":{"thought":true}}}},{"index":1,"delta":{"content":"answer","extra_content":{"flags":{"thought":false}}}},{"index":2,"delta":{"content":"more answer"}}]}\n\n' +
+          'data: [DONE]\n\n'
+      );
+
+      const result = await rewriteModelResponse_ChatCompletions(upstream, true, null, null, {
+        thoughtContentMapping: 'extra_content.flags.thought',
+      });
+      const [chunk] = dataObjects(await readOutputStream(result)) as Array<{
+        choices: Array<{ delta: Record<string, unknown> }>;
+      }>;
+
+      expect(chunk.choices[0].delta).toEqual({
+        reasoning_content: 'first thought',
+        extra_content: { flags: { thought: true } },
+      });
+      expect(chunk.choices[1].delta).toMatchObject({ content: 'answer' });
+      expect(chunk.choices[2].delta).toMatchObject({ content: 'more answer' });
+    });
+
     test('does not treat a null error field as terminal', async () => {
       const upstream = sseResponse(
         'data: {"id":"gen-chat","error":null,"choices":[]}\n\n' +
@@ -331,7 +359,7 @@ describe('rewriteModelResponse_ChatCompletions', () => {
           'data: [DONE]\n\n'
       );
 
-      const result = await rewriteModelResponse_ChatCompletions(upstream, true, null, null);
+      const result = await rewriteModelResponse_ChatCompletions(upstream, true, null, null, null);
       const sse = await readOutputStream(result);
 
       expect(sse).toContain('still streaming');
@@ -350,7 +378,8 @@ describe('rewriteModelResponse_ChatCompletions', () => {
         upstream,
         true,
         capture,
-        'iad1::terminal-request'
+        'iad1::terminal-request',
+        null
       );
       const sse = await readOutputStream(result);
 
@@ -375,7 +404,7 @@ describe('rewriteModelResponse_ChatCompletions', () => {
         'data: {"model":"upstream-model","usage":{"cost":1,"is_byok":true,"prompt_tokens":4,"completion_tokens":2,"total_tokens":6,"prompt_tokens_details":{}}}\n\n'
       );
 
-      const result = await rewriteModelResponse_ChatCompletions(upstream, true, null, null);
+      const result = await rewriteModelResponse_ChatCompletions(upstream, true, null, null, null);
       const sse = await readOutputStream(result);
       const [chunk] = dataObjects(sse) as Array<{
         model: string;
@@ -399,7 +428,7 @@ describe('rewriteModelResponse_ChatCompletions', () => {
         ': openrouter heartbeat\n\n' + 'data: {"model":"upstream-model","choices":[]}\n\n'
       );
 
-      const result = await rewriteModelResponse_ChatCompletions(upstream, true, null, null);
+      const result = await rewriteModelResponse_ChatCompletions(upstream, true, null, null, null);
       const sse = await readOutputStream(result);
 
       expect(sse).toContain(': KILO PROCESSING');
@@ -411,7 +440,7 @@ describe('rewriteModelResponse_ChatCompletions', () => {
         headers: { 'content-type': 'text/event-stream' },
       });
 
-      const result = await rewriteModelResponse_ChatCompletions(upstream, true, null, null);
+      const result = await rewriteModelResponse_ChatCompletions(upstream, true, null, null, null);
 
       expect(await readOutputStream(result)).toBe('');
     });
@@ -699,7 +728,7 @@ describe.each([
   [
     'Chat Completions',
     'chat_completions',
-    rewriteModelResponse_ChatCompletions,
+    rewriteChatCompletionsWithoutTransforms,
     'data: {"id":"gen-chat","choices":[]}\n\n',
     'data: {"error":{"code":429,"message":"rate limited"}}\n\n',
     'gen-chat',
@@ -774,7 +803,8 @@ describe('rewriteModelResponse', () => {
       'openai/gpt-5',
       'openrouter',
       'chat_completions',
-      makeLogging({ organization_id: KILO_ORGANIZATION_ID })
+      makeLogging({ organization_id: KILO_ORGANIZATION_ID }),
+      null
     );
 
     expect(result).not.toBeNull();
@@ -800,7 +830,8 @@ describe('rewriteModelResponse', () => {
       'openai/gpt-5',
       'openrouter',
       'chat_completions',
-      makeLogging({ organization_id: '00000000-0000-0000-0000-000000000000' })
+      makeLogging({ organization_id: '00000000-0000-0000-0000-000000000000' }),
+      null
     );
 
     expect(await result.json()).toMatchObject({
@@ -821,7 +852,8 @@ describe('rewriteModelResponse', () => {
       'google/gemma-4-26b-a4b-it:free',
       'openrouter',
       'chat_completions',
-      makeLogging()
+      makeLogging(),
+      null
     );
 
     expect(result).not.toBeNull();
@@ -840,7 +872,8 @@ describe('rewriteModelResponse', () => {
       QWEN37_PLUS_MODEL_ID,
       'openrouter',
       'chat_completions',
-      makeLogging()
+      makeLogging(),
+      null
     );
 
     // The upstream-reported cost does not reflect the custom pricing, so it
@@ -858,7 +891,8 @@ describe('rewriteModelResponse', () => {
       'openai/gpt-5',
       'openrouter',
       'chat_completions',
-      makeLogging({ organization_id: '00000000-0000-0000-0000-000000000000' })
+      makeLogging({ organization_id: '00000000-0000-0000-0000-000000000000' }),
+      null
     );
 
     expect(result).not.toBeNull();
@@ -976,7 +1010,7 @@ describe('request log capture', () => {
       headers: { 'content-type': 'text/event-stream' },
     });
 
-    const result = await rewriteModelResponse_ChatCompletions(upstream, true, capture, null);
+    const result = await rewriteModelResponse_ChatCompletions(upstream, true, capture, null, null);
     const reader = result.body?.getReader();
     await reader?.cancel();
 
diff --git a/apps/web/src/lib/rewriteModelResponse.ts b/apps/web/src/lib/rewriteModelResponse.ts
index ebf260680a..7c09cef0f3 100644
--- a/apps/web/src/lib/rewriteModelResponse.ts
+++ b/apps/web/src/lib/rewriteModelResponse.ts
@@ -3,7 +3,7 @@ import { isKiloExclusiveFreeModel } from '@/lib/ai-gateway/models';
 import { getCustomPricing } from '@/lib/ai-gateway/custom-pricing';
 import { detectToolCallArgumentErrors } from '@/lib/ai-gateway/api-request-log-errors';
 import type { GatewayRequest } from '@/lib/ai-gateway/providers/openrouter/types';
-import type { ProviderId } from '@/lib/ai-gateway/providers/types';
+import type { ProviderId, ProviderResponseTransforms } from '@/lib/ai-gateway/providers/types';
 import { getOutputHeaders } from '@/lib/ai-gateway/llm-proxy-helpers';
 import type { ChatCompletionChunk, OpenRouterUsage } from '@/lib/ai-gateway/processUsage.types';
 import { isDynamicallyOptedIntoRequestLogging } from '@/lib/ai-gateway/request-logging-opt-ins';
@@ -351,11 +351,40 @@ function rewriteUsage(usage: OpenRouterUsage, removeCost: boolean) {
   }
 }
 
+function isRecord(value: unknown): value is Record<string, unknown> {
+  return typeof value === 'object' && value !== null && !Array.isArray(value);
+}
+
+function getPropertyPath(target: unknown, path: string): unknown {
+  let current = target;
+  for (const segment of path.split('.')) {
+    if (!isRecord(current)) {
+      return undefined;
+    }
+    current = current[segment];
+  }
+  return current;
+}
+
+function rewriteThoughtContent(delta: unknown, path: string) {
+  if (
+    !isRecord(delta) ||
+    typeof delta.content !== 'string' ||
+    getPropertyPath(delta, path) !== true
+  ) {
+    return;
+  }
+
+  delta.reasoning_content = delta.content;
+  delete delta.content;
+}
+
 export async function rewriteModelResponse_ChatCompletions(
   response: Response,
   removeCost: boolean,
   capture: RequestLogCapture | null,
-  vercelRequestId: string | null
+  vercelRequestId: string | null,
+  responseTransforms: ProviderResponseTransforms | null
 ) {
   const headers = getOutputHeaders(response);
 
@@ -430,12 +459,18 @@ export async function rewriteModelResponse_ChatCompletions(
             });
           }
 
-          const delta = json.choices?.[0]?.delta;
-          if (delta) {
+          for (const choice of json.choices ?? []) {
+            const delta = choice.delta;
+            if (!delta) {
+              continue;
+            }
             // Some APIs set null here, which is not accepted by OpenCode
-            if (delta?.role === null) {
+            if (delta.role === null) {
               delete delta.role;
             }
+            if (responseTransforms?.thoughtContentMapping) {
+              rewriteThoughtContent(delta, responseTransforms.thoughtContentMapping);
+            }
           }
 
           if (!json.choices) {
@@ -836,7 +871,8 @@ export async function rewriteModelResponse(
   model: string,
   providerId: ProviderId,
   kind: GatewayRequest['kind'],
-  logging: RequestLoggingParams
+  logging: RequestLoggingParams,
+  responseTransforms: ProviderResponseTransforms | null
 ): Promise<NextResponse> {
   const capture = await createRequestLogCapture(response, model, providerId, logging);
   const requiresCostRemoval =
@@ -850,7 +886,8 @@ export async function rewriteModelResponse(
       response,
       requiresCostRemoval,
       capture,
-      vercelRequestId
+      vercelRequestId,
+      responseTransforms
     );
   }
   if (kind === 'responses') {
diff --git a/packages/db/src/schema-types.ts b/packages/db/src/schema-types.ts
index 751bf8f1b7..8474552727 100644
--- a/packages/db/src/schema-types.ts
+++ b/packages/db/src/schema-types.ts
@@ -1950,6 +1950,7 @@ export const CustomLlmApiConfigSchema = z.object({
   remove_from_body: z.array(z.string()).optional(),
   compression: CustomLlmCompressionSchema.optional(),
   thought_signature_mapping: CustomLlmPropertyPathSchema.optional(),
+  thought_content_mapping: CustomLlmPropertyPathSchema.optional(),
 });
 
 export type CustomLlmApiConfig = z.infer<typeof CustomLlmApiConfigSchema>;