diff --git a/package.json b/package.json
index d5845f6..470d5cf 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "web-codegen-scorer",
-  "version": "0.0.54",
+  "version": "0.0.55",
   "scripts": {
     "build-runner": "tsc",
     "release-build": "tsx ./scripts/release-build.ts",
diff --git a/runner/configuration/constants.ts b/runner/configuration/constants.ts
index 19c555c..f74c5bf 100644
--- a/runner/configuration/constants.ts
+++ b/runner/configuration/constants.ts
@@ -17,6 +17,9 @@ export const DEFAULT_MODEL_NAME = 'gemini-2.5-pro'; // slower than `flash`, but
  */
 export const DEFAULT_AUTORATER_MODEL_NAME = 'gemini-2.5-flash'; // use less expensive model
 
+/** Model used for AI summarization by default. */
+export const DEFAULT_SUMMARY_MODEL = 'gemini-2.5-flash-lite';
+
 /** Name of the root folder where we store LLM-generated code for debugging */
 export const LLM_OUTPUT_DIR = join(rootDir, 'llm-output');
 
diff --git a/runner/configuration/environment-config.ts b/runner/configuration/environment-config.ts
index ab7ef39..fefd21c 100644
--- a/runner/configuration/environment-config.ts
+++ b/runner/configuration/environment-config.ts
@@ -108,6 +108,7 @@ export const environmentConfigSchema = z.object({
       z.object({
         name: z.string(),
         path: z.string(),
+        model: z.string().optional(),
         reportsFilter: z
           .enum([ReportContextFilter.AllReports, ReportContextFilter.NonPerfectReports])
           .optional(),
diff --git a/runner/configuration/environment.ts b/runner/configuration/environment.ts
index c6abbc3..fb46334 100644
--- a/runner/configuration/environment.ts
+++ b/runner/configuration/environment.ts
@@ -18,6 +18,7 @@ import {EnvironmentConfig} from './environment-config.js';
 import {EvalPromptWithMetadata, MultiStepPrompt} from './prompts.js';
 import {renderPromptTemplate} from './prompt-templating.js';
 import {getSha256Hash} from '../utils/hashing.js';
+import {DEFAULT_SUMMARY_MODEL} from './constants.js';
 
 interface CategoryConfig {
   name: string;
@@ -27,6 +28,7 @@ interface CategoryConfig {
 interface AnalysisPrompt {
   name: string;
   prompt: string;
+  model: string;
   reportsFilter: ReportContextFilter;
   ratingsFilter: RatingContextFilter;
 }
@@ -463,12 +465,13 @@ export class Environment {
   private resolveAnalysisPrompts(config: EnvironmentConfig): AnalysisPrompt[] {
     const result: AnalysisPrompt[] = [];
 
-    config.analysisPrompts?.forEach(({name, path, reportsFilter, ratingsFilter}) => {
+    config.analysisPrompts?.forEach(({name, path, model, reportsFilter, ratingsFilter}) => {
       const prompt = this.renderEnvironmentPrompt(path).result;
 
       result.push({
         name,
         prompt,
+        model: model || DEFAULT_SUMMARY_MODEL,
         reportsFilter: reportsFilter ?? ReportContextFilter.NonPerfectReports,
         ratingsFilter: ratingsFilter ?? RatingContextFilter.NonPerfectRatings,
       });
diff --git a/runner/orchestration/generate-summary.ts b/runner/orchestration/generate-summary.ts
index 27ba1d0..38da6c5 100644
--- a/runner/orchestration/generate-summary.ts
+++ b/runner/orchestration/generate-summary.ts
@@ -12,7 +12,7 @@ import {AssessmentResult, CompletionStats, RunSummary} from '../shared-interface
 export async function prepareSummary(
   generateAiSummaryLlm: GenkitRunner | null,
   abortSignal: AbortSignal,
-  model: string,
+  evalRunModel: string,
   env: Environment,
   assessments: AssessmentResult[],
   completionStats: CompletionStats,
@@ -75,7 +75,7 @@ export async function prepareSummary(
             abortSignal,
             assessments,
             [],
-            model,
+            config.model,
             {
               reportContextFilter: config.reportsFilter,
               ratingContextFilter: config.ratingsFilter,
@@ -101,7 +101,7 @@ export async function prepareSummary(
   const executorInfo = await env.executor.getExecutorInfo?.();
 
   return {
-    model,
+    model: evalRunModel,
     environmentId: env.id,
     displayName: env.displayName,
     framework: {
diff --git a/runner/reporting/report-ai-summary.ts b/runner/reporting/report-ai-summary.ts
index 872f79e..b6918fc 100644
--- a/runner/reporting/report-ai-summary.ts
+++ b/runner/reporting/report-ai-summary.ts
@@ -1,4 +1,5 @@
 import {GenkitRunner} from '../codegen/genkit/genkit-runner.js';
+import {DEFAULT_SUMMARY_MODEL} from '../configuration/constants.js';
 import {AssessmentResult, ReportContextFilter, RatingContextFilter} from '../shared-interfaces.js';
 import {chatWithReportAI} from './report-ai-chat.js';
 
@@ -7,7 +8,7 @@ export async function summarizeReportWithAI(
   abortSignal: AbortSignal,
   assessments: AssessmentResult[],
 ) {
-  const model = 'gemini-2.5-flash-lite';
+  const model = DEFAULT_SUMMARY_MODEL;
 
   if (!llm.getSupportedModels().includes(model)) {
     throw new Error(`Unable to generate AI summary due to unsupported model: ${model}`);