diff --git a/Sources/CodexBarCore/Vendored/CostUsage/CostUsagePricing.swift b/Sources/CodexBarCore/Vendored/CostUsage/CostUsagePricing.swift
index 37f87cf57..f18842262 100644
--- a/Sources/CodexBarCore/Vendored/CostUsage/CostUsagePricing.swift
+++ b/Sources/CodexBarCore/Vendored/CostUsage/CostUsagePricing.swift
@@ -41,6 +41,14 @@ enum CostUsagePricing {
             inputCostPerToken: 1.75e-6,
             outputCostPerToken: 1.4e-5,
             cacheReadInputCostPerToken: 1.75e-7),
+        "gpt-5.4": CodexPricing(
+            inputCostPerToken: 2.5e-6,
+            outputCostPerToken: 1.5e-5,
+            cacheReadInputCostPerToken: 2.5e-7),
+        "gpt-5.4-codex": CodexPricing(
+            inputCostPerToken: 2.5e-6,
+            outputCostPerToken: 1.5e-5,
+            cacheReadInputCostPerToken: 2.5e-7),
     ]
 
     private static let claude: [String: ClaudePricing] = [
diff --git a/Tests/CodexBarTests/CostUsagePricingTests.swift b/Tests/CodexBarTests/CostUsagePricingTests.swift
index 695a4843a..242f93ff6 100644
--- a/Tests/CodexBarTests/CostUsagePricingTests.swift
+++ b/Tests/CodexBarTests/CostUsagePricingTests.swift
@@ -8,6 +8,7 @@ struct CostUsagePricingTests {
         #expect(CostUsagePricing.normalizeCodexModel("openai/gpt-5-codex") == "gpt-5")
         #expect(CostUsagePricing.normalizeCodexModel("gpt-5.2-codex") == "gpt-5.2")
         #expect(CostUsagePricing.normalizeCodexModel("gpt-5.1-codex-max") == "gpt-5.1")
+        #expect(CostUsagePricing.normalizeCodexModel("gpt-5.4-codex") == "gpt-5.4")
     }
 
     @Test
@@ -20,6 +21,17 @@ struct CostUsagePricingTests {
         #expect(cost != nil)
     }
 
+    @Test
+    func codexCostSupportsGpt54() {
+        let cost = CostUsagePricing.codexCostUSD(
+            model: "gpt-5.4",
+            inputTokens: 1_000_000,
+            cachedInputTokens: 200_000,
+            outputTokens: 50_000)
+        #expect(cost != nil)
+        #expect(cost == 2.8)
+    }
+
     @Test
     func normalizesClaudeOpus41DatedVariants() {
         #expect(CostUsagePricing.normalizeClaudeModel("claude-opus-4-1-20250805") == "claude-opus-4-1")