diff --git a/CHANGELOG.md b/CHANGELOG.md
index 016a9073..2f2ec7ee 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,15 @@
 # Changelog
 
+## Unreleased
+
+### Fixed
+- **Grok 4.6 prices from day one** — xAI's launch-day rates
+  ($2 in / $0.50 cached / $6 out per MTok, doubling for ≥200k-token
+  prompts; the fast variant at 2x) are baked in until the public
+  catalogs learn the model, so spend from Grok 4.6 sessions shows
+  dollars instead of the unpriced ⚠ — including Cursor sessions, whose
+  usage export brands the model `cursor-grok-4.6-xhigh`.
+
 ## 0.4.33 — 2026-08-12
 
 ### Fixed
diff --git a/src-tauri/src/pricing.rs b/src-tauri/src/pricing.rs
index e055a9de..83b113cd 100644
--- a/src-tauri/src/pricing.rs
+++ b/src-tauri/src/pricing.rs
@@ -166,7 +166,7 @@ pub fn generation() -> u64 {
 /// fingerprinted below — an app update that reprices the same files would
 /// otherwise leave history at the old dollars until upstream happens to
 /// rewrite a catalog.
-const CORRECTIONS_REV: u32 = 3; // 3: zero-rate catalog placeholders no longer price at $0.00
+const CORRECTIONS_REV: u32 = 4; // 4: grok-4.6 builtin launch pricing
 
 /// Stable fingerprint of the effective pricing inputs: the on-disk catalog
 /// files plus this binary's corrections revision. The persistent spend
@@ -668,6 +668,7 @@ fn builtin_price(canonical: &str) -> Option<Price> {
     let bare = canonical
         .strip_prefix("moonshot/")
         .or_else(|| canonical.strip_prefix("moonshot-ai/"))
+        .or_else(|| canonical.strip_prefix("xai/"))
         .unwrap_or(canonical);
     match bare {
         "kimi-k3" | "kimi-k3-code" => Some(Price::flat(3.0, 15.0, 0.3, 3.0)),
@@ -675,6 +676,26 @@ fn builtin_price(canonical: &str) -> Option<Price> {
         // output $6, implicit cache read $0.25, explicit cache write $2.50.
         // Public catalogs still carry 0/0 placeholders for these slugs.
         "qwen3.8-max" | "qwen3.8-max-preview" => Some(Price::flat(2.0, 6.0, 0.25, 2.5)),
+        // Grok 4.6, released 2026-08-12 — docs.x.ai/docs/pricing (USD/MTok):
+        // $2 in / $0.50 cached / $6 out; prompts ≥200k bill $4 / $1 / $12
+        // for the WHOLE request (xAI's long-context rule matches
+        // request_cost's tiering, and Grok spend passes the default 200k
+        // threshold). xAI bills no separate cache-write rate — writes are
+        // plain input. The announced 2x "-fast" variant needs no entry:
+        // the -fast resolution path applies the default 2x multiplier to
+        // this rate card. Public catalogs don't carry 4.6 yet.
+        // The cursor- spellings are Cursor's CSV branding for the same
+        // vendor-billed model ("cursor-grok-4.6-xhigh" on launch day) —
+        // matched EXPLICITLY rather than via a generic cursor- prefix
+        // strip, so other cursor-branded slugs (which Cursor may bill at
+        // its own rates) can never silently price off this baked table.
+        "grok-4.6" | "grok-4-6" | "cursor-grok-4.6" | "cursor-grok-4-6" => Some(Price {
+            input_200k: Some(4.0),
+            output_200k: Some(12.0),
+            cache_read_200k: Some(1.0),
+            cache_write_200k: Some(4.0),
+            ..Price::flat(2.0, 6.0, 0.5, 2.0)
+        }),
         _ => None,
     }
 }
@@ -768,6 +789,33 @@ mod tests {
         assert_eq!((terra.input, terra.output), (1.75, 11.0));
     }
 
+    #[test]
+    fn grok_46_builtin_prices_with_long_context_tier() {
+        // Vendor rates (docs.x.ai/docs/pricing): $2/$0.50/$6, doubling for
+        // ≥200k prompts — resolvable in every spelling before the public
+        // catalogs learn the model. Empty store = builtin only.
+        let store = super::Store::default();
+        // cursor-grok-4.6-xhigh is the exact slug Cursor's CSV logged on
+        // launch day — 20.6M real tokens showed $0.00 until it resolved.
+        for slug in
+            ["grok-4.6", "grok-4-6", "xai/grok-4.6", "grok-4.6-high", "cursor-grok-4.6-xhigh"]
+        {
+            let p = super::resolve(&store, slug, 0)
+                .unwrap_or_else(|| panic!("{slug} did not price"));
+            assert_eq!((p.input, p.output, p.cache_read, p.cache_write), (2.0, 6.0, 0.5, 2.0), "{slug}");
+            assert_eq!(
+                (p.input_200k, p.output_200k, p.cache_read_200k),
+                (Some(4.0), Some(12.0), Some(1.0)),
+                "{slug}"
+            );
+        }
+        // The fast variant is "twice the price" (launch post): the -fast
+        // path scales the whole rate card, long-context tier included.
+        let fast = super::resolve(&store, "grok-4.6-fast", 0).unwrap();
+        assert_eq!((fast.input, fast.output, fast.cache_read), (4.0, 12.0, 1.0));
+        assert_eq!(fast.input_200k, Some(8.0));
+    }
+
     #[test]
     fn kimi_k3_builtin_prices_every_spelling() {
         // Vendor-documented rates (platform.kimi.ai): $3 in, $15 out, $0.30
diff --git a/src-tauri/src/spend.rs b/src-tauri/src/spend.rs
index b0288ef1..ae1334ae 100644
--- a/src-tauri/src/spend.rs
+++ b/src-tauri/src/spend.rs
@@ -413,7 +413,18 @@ fn codex_price(model: &str) -> (f64, f64, f64) {
 
 fn grok_price(model: &str) -> (f64, f64) {
     let m = model.to_lowercase();
-    if m.contains("code") || m.contains("fast") {
+    // Grok 4.6's "fast" is a 2x PREMIUM speed tier (launch post: "twice
+    // the price"), the opposite of the older grok-4-fast/grok-code-fast
+    // line where "fast" meant a smaller, cheaper model — 4.6 slugs must
+    // never fall into that cheap branch. (Normally unreachable: the
+    // baked-in catalog entry resolves 4.6 before this backstop.)
+    if m.contains("4.6") || m.contains("4-6") {
+        if m.contains("fast") {
+            (4.0, 12.0)
+        } else {
+            (2.0, 6.0)
+        }
+    } else if m.contains("code") || m.contains("fast") {
         (0.2, 1.5)
     } else {
         (3.0, 15.0)