diff --git a/rust/src/core/cost_pricing.rs b/rust/src/core/cost_pricing.rs
index d220c6b8f8..2c522cb78a 100755
--- a/rust/src/core/cost_pricing.rs
+++ b/rust/src/core/cost_pricing.rs
@@ -620,11 +620,18 @@ impl CostUsagePricing {
             return Self::CODEX_UNATTRIBUTED_MODEL.to_string();
         }
 
-        // Remove "openai/" prefix
-        if let Some(rest) = trimmed.strip_prefix("openai/") {
+        // Remove the provider-qualified OpenAI prefix.
+        if let Some((prefix, rest)) = trimmed.split_once('/')
+            && prefix.eq_ignore_ascii_case("openai")
+        {
             trimmed = rest.to_string();
         }
 
+        // Codex uses this alias for the Luna reserve quota bucket.
+        if trimmed.eq_ignore_ascii_case("gpt-reserve") {
+            return "gpt-5.6-luna".to_string();
+        }
+
         // Check if base model (without -codex suffix) exists in pricing
         if let Some(idx) = trimmed.find("-codex") {
             let base = &trimmed[..idx];
diff --git a/rust/src/core/cost_pricing_tests.rs b/rust/src/core/cost_pricing_tests.rs
index 9984061644..e3ae70328a 100644
--- a/rust/src/core/cost_pricing_tests.rs
+++ b/rust/src/core/cost_pricing_tests.rs
@@ -20,6 +20,30 @@ fn test_normalize_codex_model() {
         CostUsagePricing::normalize_codex_model("unknown"),
         CostUsagePricing::CODEX_UNATTRIBUTED_MODEL
     );
+    assert_eq!(
+        CostUsagePricing::normalize_codex_model("gpt-reserve"),
+        "gpt-5.6-luna"
+    );
+    assert_eq!(
+        CostUsagePricing::normalize_codex_model(" GPT-RESERVE "),
+        "gpt-5.6-luna"
+    );
+    assert_eq!(
+        CostUsagePricing::normalize_codex_model("openai/gpt-reserve"),
+        "gpt-5.6-luna"
+    );
+    assert_eq!(
+        CostUsagePricing::normalize_codex_model("OPENAI/GPT-RESERVE"),
+        "gpt-5.6-luna"
+    );
+    assert_eq!(
+        CostUsagePricing::normalize_codex_model("gpt-reserve-preview"),
+        "gpt-reserve-preview"
+    );
+    assert_eq!(
+        CostUsagePricing::normalize_codex_model("my-gpt-reserve"),
+        "my-gpt-reserve"
+    );
 }
 
 #[test]
@@ -168,6 +192,22 @@ fn test_gpt56_standard_pricing() {
     }
 }
 
+#[test]
+fn gpt_reserve_alias_uses_luna_pricing() {
+    let luna =
+        CostUsagePricing::codex_cost_usd("gpt-5.6-luna", 1_000, 400, 1_000).expect("Luna pricing");
+    for model in [
+        "gpt-reserve",
+        " GPT-RESERVE ",
+        "openai/gpt-reserve",
+        "OPENAI/GPT-RESERVE",
+    ] {
+        let reserve =
+            CostUsagePricing::codex_cost_usd(model, 1_000, 400, 1_000).expect("reserve pricing");
+        assert!((reserve - luna).abs() < 1e-10, "{model}");
+    }
+}
+
 #[test]
 fn test_gpt56_long_context_pricing() {
     for (model, expected) in [