diff --git a/docs/reference.md b/docs/reference.md
index 75425eb0..3a6f6145 100644
--- a/docs/reference.md
+++ b/docs/reference.md
@@ -456,8 +456,10 @@ write kept for 5 minutes at 1.25× input and one kept for an hour at 2× input,
 and its usage says which were which (`cache_creation.ephemeral_5m_input_tokens`
 / `ephemeral_1h_input_tokens`, from the API and from Claude Code's
 transcripts). The fourth number is the 5-minute price; the fifth, when not
-given, is 2× input — Anthropic's rule, and only Anthropic reports 1-hour
-writes, so for any other model it never comes into play. A call recorded
+given, is 2× input for a Claude model — Anthropic's rule. Any other model has
+no 1-hour price unless you give one: a 1-hour write it reports is counted at
+the 5-minute price, and neither `magpie model price` nor the app's boxes show
+a 1-hour price for it. A call recorded
 before magpie kept the split counts all its writes at the 5-minute price, as
 it did.
 
diff --git a/internal/catalog/catalog.go b/internal/catalog/catalog.go
index 8c09fb53..0715a638 100644
--- a/internal/catalog/catalog.go
+++ b/internal/catalog/catalog.go
@@ -105,8 +105,8 @@ type Price struct {
 	// CacheWrite1h is what a cache write kept for an hour costs, Anthropic's
 	// 1-hour TTL, which it bills at 2× input where a 5-minute write (the
 	// CacheWrite above) is 1.25×. 0 is not given: such a write is then
-	// counted at 2× input, Anthropic's rule for every model, as only
-	// Anthropic's usage says which writes were for an hour.
+	// counted at the 5-minute price, as no other vendor has an hour's
+	// writes to bill apart; a Claude model's is 2× input (OneHourFor).
 	CacheWrite1h float64 `json:"cache_write_1h,omitempty"`
 	// Tiers are the prices a request is billed at, whole, once its input
 	// goes over a size (OpenAI's gpt-6-astra: 2× input and cache, 1.5×
@@ -177,10 +177,13 @@ func (p *Price) UnmarshalJSON(b []byte) error {
 	return nil
 }
 
-// claudeOneHour gives a Claude model's list price its 1-hour cache write,
-// which models.dev doesn't list: 2× input, as Anthropic bills it for every
-// model, wherever the model has a (5-minute) cache write price at all.
-func claudeOneHour(id string, p *Price) {
+// OneHourFor gives a Claude model's price its 1-hour cache write where none
+// is given — models.dev lists none, and a price the user gives may leave it
+// out: 2× input, as Anthropic bills it for every model, wherever the model
+// has a (5-minute) cache write price at all. Any other model's stays
+// unset, its writes all at the 5-minute price: only Anthropic has a 1-hour
+// one (PAMI on Discord: gpt-6-astra was shown a $20 one that isn't).
+func OneHourFor(id string, p *Price) {
 	if p == nil || p.CacheWrite <= 0 || p.CacheWrite1h > 0 || !strings.Contains(strings.ToLower(id), "claude") {
 		return
 	}
@@ -222,12 +225,12 @@ func (p Price) At(prompt int) Price {
 }
 
 // OneHour is what a 1-hour cache write costs at this flat price: the price
-// given, else 2× input, Anthropic's rule.
+// given, else the 5-minute one (a Claude model's is given, OneHourFor).
 func (p Price) OneHour() float64 {
 	if p.CacheWrite1h > 0 {
 		return p.CacheWrite1h
 	}
-	return 2 * p.Input
+	return p.CacheWrite
 }
 
 // Cost of a call at this price, every cache write a 5-minute one.
@@ -370,7 +373,7 @@ func load() map[string]mdProvider {
 					voted := map[string]bool{}
 					for pid, p := range m {
 						for id, x := range p.Models {
-							claudeOneHour(id, x.Cost)
+							OneHourFor(id, x.Cost)
 							if e := x.efforts(); len(e) > 0 {
 								l := strings.Join(e, ",")
 								if levels[bareID(id)] == nil {
diff --git a/internal/catalog/price_tiers_test.go b/internal/catalog/price_tiers_test.go
index 49a8aad6..d845f26f 100644
--- a/internal/catalog/price_tiers_test.go
+++ b/internal/catalog/price_tiers_test.go
@@ -56,12 +56,24 @@ func TestPriceTiers(t *testing.T) {
 }
 
 // Anthropic bills a 1-hour cache write at 2× input and a 5-minute one at
-// 1.25×: a call's 1-hour writes at theirs, the price's own else 2× input,
-// and a call from before the split was kept (none for 1 hour) as before.
+// 1.25×: a call's 1-hour writes at theirs, the price's own else the
+// 5-minute one (PAMI on Discord: not 2× input for a model with no 1-hour
+// writes at all), and a call from before the split was kept (none for 1
+// hour) as before. A Claude model's price is given 2× input.
 func TestCostSplit(t *testing.T) {
 	p := Price{Input: 5, Output: 25, CacheRead: 0.5, CacheWrite: 6.25}
-	if got, want := p.CostSplit(1000, 100, 0, 3000, 1000), (1000*5.0+100*25+2000*6.25+1000*10)/1e6; !near(got, want) {
-		t.Errorf("unset 1h: %v, want %v", got, want)
+	if got, want := p.CostSplit(1000, 100, 0, 3000, 1000), (1000*5.0+100*25+3000*6.25)/1e6; !near(got, want) {
+		t.Errorf("unset 1h: %v, want %v, every write at the 5-minute price", got, want)
+	}
+	c := p
+	OneHourFor("claude-sonnet-5-5", &c)
+	if got, want := c.CostSplit(1000, 100, 0, 3000, 1000), (1000*5.0+100*25+2000*6.25+1000*10)/1e6; !near(got, want) {
+		t.Errorf("claude unset 1h: %v, want %v", got, want)
+	}
+	g := p
+	OneHourFor("gpt-6-astra", &g)
+	if g.CacheWrite1h != 0 {
+		t.Errorf("gpt given a 1-hour write: %v", g.CacheWrite1h)
 	}
 	p.CacheWrite1h = 8
 	if got, want := p.CostSplit(1000, 100, 0, 3000, 1000), (1000*5.0+100*25+2000*6.25+1000*8)/1e6; !near(got, want) {
diff --git a/internal/gui/assets/app.js b/internal/gui/assets/app.js
index 0afcc657..3d2203a3 100644
--- a/internal/gui/assets/app.js
+++ b/internal/gui/assets/app.js
@@ -8619,7 +8619,9 @@ function renderModels(p) {
       // Usage page counts it (#819: only `magpie model price` set it):
       // each box shows its list price until a price is given, a part left
       // empty is the list's, and every part empty is its list price again
-      // the 1-hour cache write, empty, is 2× input as Anthropic bills it;
+      // the 1-hour cache write, empty, is 2× input as Anthropic bills it,
+      // and only a Claude model (or one priced with one) has the box: no
+      // other vendor has 1-hour writes (PAMI on Discord);
       // a long-context price (OpenAI's over 272K) is what the whole request
       // costs when its input is over its size, empty parts its list's
       const parts = [["input", "Input"], ["output", "Output"], ["cache_read", "Cache read"], ["cache_write", "Cache write"], ["cache_write_1h", "Cache write 1h"]];
@@ -8647,7 +8649,10 @@ function renderModels(p) {
         const value = typed ? typed[n] : !pr ? "" : k === "cache_write_1h" ? pr.cache_write_1h ? shown(pr.cache_write_1h) : "" : shown(pr[k]);
         const placeholder = !m.list ? "" : k === "cache_write_1h" ? shown(oneHour(m.list)) : shown(m.list[k]);
         const i = cell(value, placeholder, k, t(l));
-        if (k === "cache_write_1h") box.title = t("A cache write kept for an hour, as Anthropic bills it; empty: 2× input");
+        if (k === "cache_write_1h") {
+          box.title = t("A cache write kept for an hour, as Anthropic bills it; empty: 2× input");
+          box.hidden = !/claude/i.test(m.id) && !m.list?.cache_write_1h && !pr?.cache_write_1h && !(typed && typed[n]);
+        }
         box.append(el("span", "", t(l)), i);
         priceBox.append(box);
         return i;
diff --git a/internal/gui/tests/model-price-tiers.test.cjs b/internal/gui/tests/model-price-tiers.test.cjs
index 4a999b40..f5d38a13 100644
--- a/internal/gui/tests/model-price-tiers.test.cjs
+++ b/internal/gui/tests/model-price-tiers.test.cjs
@@ -80,7 +80,11 @@ for (const engine of (process.env.BROWSER ? [process.env.BROWSER] : ["chromium",
       assert.deepEqual(await tier("gpt-6-astra").evaluateAll((is) => is.map((i) => [i.value, i.placeholder])), [["", "272K"], ["", "20"], ["", "75"], ["", "2"], ["", "25"]]);
       // the 1-hour box shows the list's, else 2× its input
       assert.deepEqual(await base("claude-opus-5-5").evaluateAll((is) => is.map((i) => i.placeholder)), ["5", "25", "0.5", "6.25", "10"]);
-      assert.deepEqual(await base("gpt-6-astra").evaluateAll((is) => is.at(-1).placeholder), "20");
+      // only a Claude model has a 1-hour box: gpt-6-astra has no such write
+      // to price, so no 2× input one is shown for it (PAMI on Discord)
+      assert(await row("claude-opus-5-5").getByRole("textbox", { name: L.oneHour, exact: true }).isVisible());
+      assert(!(await row("gpt-6-astra").getByRole("textbox", { name: L.oneHour, exact: true }).isVisible()));
+      assert(!(await row("plain-1").getByRole("textbox", { name: L.oneHour, exact: true }).isVisible()));
       // where there is none, the row waits behind a link
       assert(!(await row("plain-1").locator(".mtier").isVisible()));
       assert(await row("plain-1").locator(".mtier-add").isVisible());
diff --git a/internal/provider/models.go b/internal/provider/models.go
index 1048dc86..d55bad63 100644
--- a/internal/provider/models.go
+++ b/internal/provider/models.go
@@ -917,6 +917,8 @@ func EffectivePriceIn(s settings.Settings, providerID, model string) (catalog.Pr
 	for _, key := range [...]string{id + "/" + model, id + "/*", AnyPriceKey(model)} {
 		if m, ok := s.ModelPrices[key]; ok {
 			if pr, bad := m.Price(); bad == "" {
+				// a Claude model's 1-hour cache write left out: 2× input
+				catalog.OneHourFor(model, &pr)
 				return pr, true
 			}
 		}
diff --git a/internal/sessions/sessions.go b/internal/sessions/sessions.go
index c12bdc09..8b57c475 100644
--- a/internal/sessions/sessions.go
+++ b/internal/sessions/sessions.go
@@ -1248,6 +1248,7 @@ func priceOf(s settings.Settings, model string) (catalog.Price, bool) {
 	// from them
 	if p, ok := s.ModelPrices[provider.AnyPriceKey(bare)]; ok {
 		if pr, bad := p.Price(); bad == "" {
+			catalog.OneHourFor(bare, &pr)
 			return pr, true
 		}
 	}
diff --git a/internal/settings/price_tiers_test.go b/internal/settings/price_tiers_test.go
index be714531..0e8ce4e6 100644
--- a/internal/settings/price_tiers_test.go
+++ b/internal/settings/price_tiers_test.go
@@ -32,7 +32,7 @@ func TestModelPriceTiers(t *testing.T) {
 	if err := json.Unmarshal([]byte(`{"input":1,"output":2,"cache_read":0.1,"cache_write":0}`), &old); err != nil {
 		t.Fatal(err)
 	}
-	if got, bad := old.Price(); bad != "" || !got.Same(catalog.Price{Input: 1, Output: 2, CacheRead: 0.1}) || got.OneHour() != 2 {
+	if got, bad := old.Price(); bad != "" || !got.Same(catalog.Price{Input: 1, Output: 2, CacheRead: 0.1}) || got.OneHour() != 0 {
 		t.Errorf("an old price = %+v, %q", got, bad)
 	}
 	if b, _ := json.Marshal(StatedPrice(catalog.Price{Input: 1, Output: 2})); strings.Contains(string(b), "cache_write_1h") || strings.Contains(string(b), "tiers") {
diff --git a/internal/settings/settings.go b/internal/settings/settings.go
index 35b1a830..deb56aa9 100644
--- a/internal/settings/settings.go
+++ b/internal/settings/settings.go
@@ -374,7 +374,8 @@ type ModelPrice struct {
 	CacheRead  *float64 `json:"cache_read,omitempty"`
 	CacheWrite *float64 `json:"cache_write,omitempty"`
 	// CacheWrite1h is a 1-hour cache write's price, absent where none is
-	// given: such a write is then counted at 2× input (catalog.Price).
+	// given: such a write is then counted at 2× input for a Claude model,
+	// else at the 5-minute price (catalog.OneHourFor).
 	CacheWrite1h *float64 `json:"cache_write_1h,omitempty"`
 	// Tiers are the prices of a request whose input is over a size, each
 	// whole: "magpie model price … --tier 272k …" (PAMI on Discord).
diff --git a/model_cli.go b/model_cli.go
index f5a465cf..695e1155 100644
--- a/model_cli.go
+++ b/model_cli.go
@@ -27,7 +27,7 @@ const modelUsage = `usage:
                                                  say what it costs, in USD per million tokens, all four parts as
                                                  0.12,1.20,0.01,0.15; 0 is a model served for nothing, which is
                                                  a price, not the absence of one; a fifth part is a 1-hour cache
-                                                 write's (Anthropic's 2× input, what it is counted at if not given)
+                                                 write's (not given: a Claude model's is 2× input, any other's the 4th)
   magpie model price <provider/model> <in>,<out>,<cache read>,<cache write> --tier 272k <in>,<out>,<cr>,<cw>
                                                  and what a request whose input, cached tokens included, is over
                                                  272K costs, the whole request; --tier may be given again
@@ -389,10 +389,12 @@ func parsePrice(rest []string) (catalog.Price, error) {
 
 // priceDetail is the parts of a price after the two perMillion gives: its
 // cache's, and what a request over each of its sizes costs.
+// A 1-hour cache write is shown only where the price has one — a Claude
+// model's, or one given — not one no vendor bills (PAMI on Discord).
 func priceDetail(p catalog.Price) []string {
-	cache := "  · cache read " + money(p.CacheRead) + ", cache write " + money(p.CacheWrite) + " (5 min), " + money(p.OneHour()) + " (1 hour)"
-	if p.CacheWrite1h <= 0 {
-		cache += " at 2× input"
+	cache := "  · cache read " + money(p.CacheRead) + ", cache write " + money(p.CacheWrite)
+	if p.CacheWrite1h > 0 {
+		cache += " (5 min), " + money(p.CacheWrite1h) + " (1 hour)"
 	}
 	lines := []string{cache}
 	for _, t := range p.Tiers {
@@ -424,6 +426,7 @@ func anyModelPrice(ref string, rest []string) error {
 	}
 	if len(rest) == 0 {
 		if pr, ok := statedPrice(settings.Load().ModelPrices, key); ok {
+			catalog.OneHourFor(strings.TrimPrefix(key, settings.AnyProvider), &pr)
 			fmt.Println(bold.Render(perMillion(pr)), muted.Render("· "+key))
 			for _, l := range priceDetail(pr) {
 				fmt.Println(faint.Render(l))
diff --git a/model_price_tier_cli_test.go b/model_price_tier_cli_test.go
index 314bf115..b83d1cea 100644
--- a/model_price_tier_cli_test.go
+++ b/model_price_tier_cli_test.go
@@ -37,6 +37,26 @@ func TestModelPriceTierCmd(t *testing.T) {
 		t.Errorf("magpie model prices: %q; want its tier", out)
 	}
 
+	// PAMI on Discord: four parts give no 1-hour cache write but a Claude
+	// model's — gpt-6-astra was shown "$20 (1 hour) at 2× input", a write
+	// OpenAI has no price for
+	if strings.Contains(out, "1 hour") || strings.Contains(out, "2× input") {
+		t.Errorf("magpie model price a/m: %q; want no 1-hour cache write", out)
+	}
+	if pr.OneHour() != 12.5 {
+		t.Errorf("a/m 1h = %v, want the 5-minute 12.5", pr.OneHour())
+	}
+	if err := modelCmd([]string{"price", "a/claude-opus-5-5", "3,15,0.3,3.75"}); err != nil {
+		t.Fatal(err)
+	}
+	if pr, _ := provider.EffectivePrice("a", "claude-opus-5-5"); pr.OneHour() != 6 {
+		t.Errorf("claude 1h = %+v, want 2× input", pr)
+	}
+	out, _ = said(t, func() error { return modelCmd([]string{"price", "a/claude-opus-5-5"}) })
+	if !strings.Contains(out, "$6.00 (1 hour)") && !strings.Contains(out, "$6 (1 hour)") {
+		t.Errorf("magpie model price a/claude-opus-5-5: %q; want its 1-hour cache write", out)
+	}
+
 	if err := modelCmd([]string{"price", "a/only-a", "5,25,0.5,6.25,8"}); err != nil {
 		t.Fatal(err)
 	}