diff --git a/actions/setup/js/handle_agent_failure.test.cjs b/actions/setup/js/handle_agent_failure.test.cjs
index 813483cc87a..613a724b24c 100644
--- a/actions/setup/js/handle_agent_failure.test.cjs
+++ b/actions/setup/js/handle_agent_failure.test.cjs
@@ -265,6 +265,7 @@ describe("handle_agent_failure", () => {
     it("includes AIC and ambient context metrics in the generated failure issue footer", async () => {
       process.env.GH_AW_AIC = "1.25";
       process.env.GH_AW_AMBIENT_CONTEXT = "900";
+      process.env.GH_AW_ENGINE_MODEL = "claude-sonnet-4.6";
       /** @type {string} */
       let capturedIssueBody = "";
 
@@ -296,10 +297,11 @@ describe("handle_agent_failure", () => {
       try {
         await main();
 
-        expect(capturedIssueBody).toContain("> Generated from [Test Workflow](https://github.com/owner/repo/actions/runs/123456) · 1.25 AIC · ⊞ 900");
+        expect(capturedIssueBody).toContain("> Generated from [Test Workflow](https://github.com/owner/repo/actions/runs/123456) · sonnet46 1.25 AIC · ⊞ 900");
       } finally {
         delete process.env.GH_AW_AIC;
         delete process.env.GH_AW_AMBIENT_CONTEXT;
+        delete process.env.GH_AW_ENGINE_MODEL;
       }
     });
 
diff --git a/actions/setup/js/handle_noop_message.cjs b/actions/setup/js/handle_noop_message.cjs
index d435e3fd2cb..14633486c27 100644
--- a/actions/setup/js/handle_noop_message.cjs
+++ b/actions/setup/js/handle_noop_message.cjs
@@ -11,6 +11,7 @@ const { loadAgentOutput } = require("./load_agent_output.cjs");
 const { isStagedMode } = require("./safe_output_helpers.cjs");
 const { generateHistoryUrl } = require("./generate_history_link.cjs");
 const { formatAIC } = require("./model_costs.cjs");
+const { reduceModelNameToIdentifier } = require("./model_aliases.cjs");
 /**
  * Search for or create the parent issue for all agentic workflow no-op runs
  * @returns {Promise<{number: number, node_id: string}>} Parent issue number and node ID
@@ -87,11 +88,12 @@ function buildAICSuffix() {
   const detectionRaw = process.env.GH_AW_THREAT_DETECTION_AIC;
   const agentAIC = agentRaw ? Number.parseFloat(agentRaw) : NaN;
   const detectionAIC = detectionRaw ? Number.parseFloat(detectionRaw) : NaN;
+  const compressedModelName = reduceModelNameToIdentifier(process.env.GH_AW_PRIMARY_MODEL || process.env.GH_AW_ENGINE_MODEL);
   const totalAIC = (Number.isFinite(agentAIC) && agentAIC > 0 ? agentAIC : 0) + (Number.isFinite(detectionAIC) && detectionAIC > 0 ? detectionAIC : 0);
   if (totalAIC <= 0) {
     return "";
   }
-  return ` · ${formatAIC(totalAIC)} AIC`;
+  return ` · ${compressedModelName ? `${compressedModelName} ` : ""}${formatAIC(totalAIC)} AIC`;
 }
 
 /**
diff --git a/actions/setup/js/handle_noop_message.test.cjs b/actions/setup/js/handle_noop_message.test.cjs
index 5f21d0a07e6..3bde070351e 100644
--- a/actions/setup/js/handle_noop_message.test.cjs
+++ b/actions/setup/js/handle_noop_message.test.cjs
@@ -763,6 +763,7 @@ This issue helps you:
     process.env.GH_AW_AGENT_CONCLUSION = "success";
     process.env.GH_AW_AIC = "0.100";
     process.env.GH_AW_THREAT_DETECTION_AIC = "0.025";
+    process.env.GH_AW_ENGINE_MODEL = "claude-sonnet-4.6";
 
     const outputFile = path.join(tempDir, "agent_output.json");
     fs.writeFileSync(outputFile, JSON.stringify({ items: [{ type: "noop", message: "No action needed" }] }));
@@ -777,7 +778,7 @@ This issue helps you:
     await main();
 
     const commentCall = mockGithub.rest.issues.createComment.mock.calls[0][0];
-    expect(commentCall.body).toContain("0.125 AIC");
+    expect(commentCall.body).toContain("sonnet46 0.125 AIC");
   });
 
   it("should not include AIC suffix in comment footer when GH_AW_AIC is not set", async () => {
diff --git a/actions/setup/js/messages.test.cjs b/actions/setup/js/messages.test.cjs
index 123ab252278..5de160f29ab 100644
--- a/actions/setup/js/messages.test.cjs
+++ b/actions/setup/js/messages.test.cjs
@@ -32,6 +32,7 @@ describe("messages.cjs", () => {
     delete process.env.GH_AW_ENGINE_ID;
     delete process.env.GH_AW_ENGINE_VERSION;
     delete process.env.GH_AW_ENGINE_MODEL;
+    delete process.env.GH_AW_PRIMARY_MODEL;
     delete process.env.GH_AW_TRACKER_ID;
     delete process.env.GITHUB_RUN_ID;
     delete process.env.GH_AW_WORKFLOW_ID;
@@ -403,6 +404,7 @@ describe("messages.cjs", () => {
     it("should include AI Credits without effective tokens when GH_AW_AIC is set", async () => {
       process.env.GH_AW_EFFECTIVE_TOKENS = "5000";
       process.env.GH_AW_AIC = "0.125";
+      process.env.GH_AW_ENGINE_MODEL = "claude-sonnet-4.6";
 
       const { getFooterMessage } = await import("./messages.cjs");
 
@@ -411,7 +413,7 @@ describe("messages.cjs", () => {
         runUrl: "https://github.com/test/repo/actions/runs/123",
       });
 
-      expect(result).toBe("> Generated by [Test Workflow](https://github.com/test/repo/actions/runs/123) · 0.125 AIC");
+      expect(result).toBe("> Generated by [Test Workflow](https://github.com/test/repo/actions/runs/123) · sonnet46 0.125 AIC");
     });
 
     it("should include ambient context in the default footer when GH_AW_AMBIENT_CONTEXT is set", async () => {
@@ -1142,6 +1144,7 @@ describe("messages.cjs", () => {
     it("should include AIC and ambient context in default footer when available", async () => {
       process.env.GH_AW_AIC = "1.25";
       process.env.GH_AW_AMBIENT_CONTEXT = "900";
+      process.env.GH_AW_ENGINE_MODEL = "claude-sonnet-4.6";
 
       const { getFooterAgentFailureIssueMessage } = await import("./messages.cjs");
 
@@ -1150,7 +1153,7 @@ describe("messages.cjs", () => {
         runUrl: "https://github.com/test/repo/actions/runs/123",
       });
 
-      expect(result).toBe("> Generated from [Test Workflow](https://github.com/test/repo/actions/runs/123) · 1.25 AIC · ⊞ 900");
+      expect(result).toBe("> Generated from [Test Workflow](https://github.com/test/repo/actions/runs/123) · sonnet46 1.25 AIC · ⊞ 900");
     });
 
     it("should suppress env AIC fallback when explicit context AIC is zero", async () => {
@@ -1241,6 +1244,7 @@ describe("messages.cjs", () => {
     it("should include ambient context in the default footer when available", async () => {
       process.env.GH_AW_AIC = "1.25";
       process.env.GH_AW_AMBIENT_CONTEXT = "900";
+      process.env.GH_AW_ENGINE_MODEL = "claude-sonnet-4.6";
 
       const { getFooterAgentFailureCommentMessage } = await import("./messages.cjs");
 
@@ -1249,7 +1253,7 @@ describe("messages.cjs", () => {
         runUrl: "https://github.com/test/repo/actions/runs/123",
       });
 
-      expect(result).toBe("> Generated from [Test Workflow](https://github.com/test/repo/actions/runs/123) · 1.25 AIC · ⊞ 900");
+      expect(result).toBe("> Generated from [Test Workflow](https://github.com/test/repo/actions/runs/123) · sonnet46 1.25 AIC · ⊞ 900");
     });
 
     it("should expose ai_credits_suffix in custom comment footer templates", async () => {
diff --git a/actions/setup/js/messages_footer.cjs b/actions/setup/js/messages_footer.cjs
index 71a72ef0a76..5956bfd75eb 100644
--- a/actions/setup/js/messages_footer.cjs
+++ b/actions/setup/js/messages_footer.cjs
@@ -14,6 +14,7 @@ const { getBlockedDomains, generateBlockedDomainsSection } = require("./firewall
 const { getDifcFilteredEvents, generateDifcFilteredSection } = require("./gateway_difc_filtered.cjs");
 const { formatCompactInteger } = require("./compact_numbers.cjs");
 const { formatAIC } = require("./model_costs.cjs");
+const { reduceModelNameToIdentifier } = require("./model_aliases.cjs");
 const { getDetectionWarningMessage } = require("./messages_run_status.cjs");
 
 /**
@@ -76,15 +77,16 @@ function getAmbientContextFromEnv() {
 /**
  * @param {string} label
  * @param {number|undefined} value
+ * @param {string|undefined} [modelAlias]
  * @returns {{ value: number|undefined, formatted: string|undefined, suffix: string }}
  */
-function buildAICEntry(label, value) {
+function buildAICEntry(label, value, modelAlias) {
   const formatted = typeof value === "number" ? formatAIC(value) : undefined;
-  const labelPrefix = label ? `${label} ` : "";
+  const prefix = [label, modelAlias].filter(Boolean).join(" ");
   return {
     value,
     formatted,
-    suffix: formatted ? ` · ${labelPrefix}${formatted} AIC` : "",
+    suffix: formatted ? ` · ${prefix ? `${prefix} ` : ""}${formatted} AIC` : "",
   };
 }
 
@@ -95,6 +97,7 @@ function buildAICEntry(label, value) {
  *   aiCredits: number|undefined,
  *   aiCreditsFormatted: string|undefined,
  *   aiCreditsSuffix: string,
+ *   compressedModelName: string|undefined,
  *   agentAiCredits: number|undefined,
  *   agentAiCreditsFormatted: string|undefined,
  *   agentAiCreditsSuffix: string,
@@ -104,21 +107,23 @@ function buildAICEntry(label, value) {
  * }}
  */
 function getAICFromEnv() {
+  const compressedModelName = reduceModelNameToIdentifier(process.env.GH_AW_PRIMARY_MODEL || process.env.GH_AW_ENGINE_MODEL);
   const totalAIC = parsePositiveAIC(process.env.GH_AW_AIC);
   const explicitAgentAIC = parsePositiveAIC(process.env.GH_AW_AGENT_AIC);
   const threatDetectionAIC = parsePositiveAIC(process.env.GH_AW_THREAT_DETECTION_AIC);
   const agentAIC = typeof explicitAgentAIC === "number" ? explicitAgentAIC : totalAIC;
-  const agentEntry = buildAICEntry("", agentAIC);
+  const agentEntry = buildAICEntry("", agentAIC, compressedModelName);
   const threatDetectionEntry = buildAICEntry("⌖", threatDetectionAIC);
   const useBreakdown = threatDetectionEntry.suffix.length > 0;
   const aiCredits = useBreakdown ? (agentAIC || 0) + (threatDetectionAIC || 0) : typeof totalAIC === "number" ? totalAIC : agentAIC;
   const aiCreditsFormatted = typeof aiCredits === "number" ? formatAIC(aiCredits) : undefined;
-  const aiCreditsSuffix = useBreakdown ? `${agentEntry.suffix}${threatDetectionEntry.suffix}` : aiCreditsFormatted ? ` · ${aiCreditsFormatted} AIC` : "";
+  const aiCreditsSuffix = useBreakdown ? `${agentEntry.suffix}${threatDetectionEntry.suffix}` : buildAICEntry("", aiCredits, compressedModelName).suffix;
 
   return {
     aiCredits,
     aiCreditsFormatted,
     aiCreditsSuffix,
+    compressedModelName,
     agentAiCredits: agentEntry.value,
     agentAiCreditsFormatted: agentEntry.formatted,
     agentAiCreditsSuffix: agentEntry.suffix,
@@ -158,6 +163,7 @@ function getFooterMessage(ctx) {
     aiCredits: envAIC,
     aiCreditsFormatted: envAICFormatted,
     aiCreditsSuffix: envAICSuffix,
+    compressedModelName,
     agentAiCredits,
     agentAiCreditsFormatted,
     agentAiCreditsSuffix,
@@ -181,7 +187,7 @@ function getFooterMessage(ctx) {
   let aiCreditsSuffix = envAICSuffix;
   if (hasExplicitContextAIC) {
     aiCreditsFormatted = explicitContextAIC ? formatAIC(explicitContextAIC) : undefined;
-    aiCreditsSuffix = aiCreditsFormatted ? ` · ${aiCreditsFormatted} AIC` : "";
+    aiCreditsSuffix = buildAICEntry("", explicitContextAIC, compressedModelName).suffix;
   }
   const aiCreditsSuffixForTemplate = `${aiCreditsSuffix}${envAmbientContextSuffix}`;
 
@@ -377,6 +383,7 @@ function getFooterAgentFailureIssueMessage(ctx) {
     aiCredits: envAIC,
     aiCreditsFormatted: envAICFormatted,
     aiCreditsSuffix: envAICSuffix,
+    compressedModelName,
     agentAiCredits,
     agentAiCreditsFormatted,
     agentAiCreditsSuffix,
@@ -389,7 +396,7 @@ function getFooterAgentFailureIssueMessage(ctx) {
   const explicitContextAIC = parseExplicitContextAIC(ctx.aiCredits);
   const aiCredits = hasExplicitContextAIC ? explicitContextAIC : envAIC;
   const aiCreditsFormatted = hasExplicitContextAIC ? (explicitContextAIC ? formatAIC(explicitContextAIC) : undefined) : envAICFormatted;
-  const aiCreditsSuffix = hasExplicitContextAIC ? (aiCreditsFormatted ? ` · ${aiCreditsFormatted} AIC` : "") : envAICSuffix;
+  const aiCreditsSuffix = hasExplicitContextAIC ? buildAICEntry("", explicitContextAIC, compressedModelName).suffix : envAICSuffix;
   const aiCreditsSuffixForTemplate = `${aiCreditsSuffix}${ambientContextSuffix}`;
 
   // Create context with both camelCase and snake_case keys, including computed history_link and agentic_workflow_url
@@ -452,6 +459,7 @@ function getFooterAgentFailureCommentMessage(ctx) {
     aiCredits: envAIC,
     aiCreditsFormatted: envAICFormatted,
     aiCreditsSuffix: envAICSuffix,
+    compressedModelName,
     agentAiCredits,
     agentAiCreditsFormatted,
     agentAiCreditsSuffix,
@@ -464,7 +472,7 @@ function getFooterAgentFailureCommentMessage(ctx) {
   const explicitContextAIC = parseExplicitContextAIC(ctx.aiCredits);
   const aiCredits = hasExplicitContextAIC ? explicitContextAIC : envAIC;
   const aiCreditsFormatted = hasExplicitContextAIC ? (explicitContextAIC ? formatAIC(explicitContextAIC) : undefined) : envAICFormatted;
-  const aiCreditsSuffix = hasExplicitContextAIC ? (aiCreditsFormatted ? ` · ${aiCreditsFormatted} AIC` : "") : envAICSuffix;
+  const aiCreditsSuffix = hasExplicitContextAIC ? buildAICEntry("", explicitContextAIC, compressedModelName).suffix : envAICSuffix;
   const aiCreditsSuffixForTemplate = `${aiCreditsSuffix}${ambientContextSuffix}`;
 
   // Create context with both camelCase and snake_case keys, including computed history_link and agentic_workflow_url
diff --git a/actions/setup/js/parse_token_usage.cjs b/actions/setup/js/parse_token_usage.cjs
index 2e71f2b8052..5701cf10028 100644
--- a/actions/setup/js/parse_token_usage.cjs
+++ b/actions/setup/js/parse_token_usage.cjs
@@ -200,6 +200,11 @@ async function main() {
     };
     fs.writeFileSync(AGENT_USAGE_PATH, JSON.stringify(agentUsage) + "\n");
 
+    if (primaryModel) {
+      core.exportVariable("GH_AW_PRIMARY_MODEL", primaryModel);
+      core.setOutput("primary_model", primaryModel);
+      core.info(`Primary model: ${primaryModel}`);
+    }
     if (summary.totalAIC > 0) {
       const aic = summary.totalAIC.toFixed(3);
       core.exportVariable("GH_AW_AIC", aic);
diff --git a/actions/setup/js/parse_token_usage.test.cjs b/actions/setup/js/parse_token_usage.test.cjs
index dffdeb99c7e..49ec46798eb 100644
--- a/actions/setup/js/parse_token_usage.test.cjs
+++ b/actions/setup/js/parse_token_usage.test.cjs
@@ -299,6 +299,9 @@ describe("parse_token_usage", () => {
       expect(typeof agentUsage.ai_credits).toBe("number");
       // primary_model is the actual model from token-usage data (not a user alias)
       expect(agentUsage.primary_model).toBe("claude-sonnet-4-6");
+      // GH_AW_PRIMARY_MODEL is exported so footer attribution can use the real model name
+      expect(mockCore.exportVariable).toHaveBeenCalledWith("GH_AW_PRIMARY_MODEL", "claude-sonnet-4-6");
+      expect(mockCore.setOutput).toHaveBeenCalledWith("primary_model", "claude-sonnet-4-6");
     });
 
     test("handles multiple model entries", async () => {