Correct current Anthropic cost estimates

Price Anthropic Opus 4.5 through 5 at the current first-party rates while preserving legacy Opus pricing. Correct Haiku 4.5 in the same version-sensitive table and add regression coverage for current and legacy aliases.\n\nFixes #1789

docs/release-control/v6/internal/subsystems/ai-runtime.md

@@ -6627,6 +6627,16 @@ uses the provider resolved by Patrol readiness, even when the configured
 OpenRouter model is an unprefixed slash route such as
 `anthropic/claude-sonnet-5`; scorer replay persists and reuses that resolved
 provider so the same captured report prices deterministically.
+First-party Anthropic cost estimation is version-sensitive even within one
+model family. Standard API calls for Opus 4.5, 4.6, 4.7, 4.8, and 5 use the
+reviewed $5 input / $25 output per-million-token rates, while Opus 4, 4.1, and
+3 retain the legacy $15 / $75 rates. Haiku 4.5 similarly uses $1 / $5 rather
+than the Haiku 3 fallback. These version-specific rows must precede broad
+family fallbacks because pricing lookup is first-match prefix-based, and
+dated model aliases must resolve to the same row as their base version. The
+30-day runtime budget recalculates retained usage through this table, so a
+stale higher fallback must not disable Assistant or Patrol before estimated
+first-party spend reaches the configured limit.
 After a non-interactive Patrol finding lifecycle write succeeds, the structured
 tool result is authoritative and investigation remains closed. Watch first
 offers a bounded lifecycle-completion request containing only report and

internal/ai/cost/pricing.go

@@ -51,8 +51,18 @@ var providerPrices = map[string][]modelPrice{
 		flatPrice("gpt-4o*", 5.00, 15.00),
 	},
 	"anthropic": {
+		// Anthropic first-party standard API prices, checked from
+		// https://platform.claude.com/docs/en/about-claude/pricing on 2026-08-28.
+		// Keep version-specific rows before the legacy family fallbacks because
+		// lookupPrice returns the first matching prefix.
+		flatPriceAsOf("claude-opus-5*", 5.00, 25.00, "2026-08-28"),
+		flatPriceAsOf("claude-opus-4-8*", 5.00, 25.00, "2026-08-28"),
+		flatPriceAsOf("claude-opus-4-7*", 5.00, 25.00, "2026-08-28"),
+		flatPriceAsOf("claude-opus-4-6*", 5.00, 25.00, "2026-08-28"),
+		flatPriceAsOf("claude-opus-4-5*", 5.00, 25.00, "2026-08-28"),
 		flatPrice("claude-opus*", 15.00, 75.00),
 		flatPrice("claude-sonnet*", 3.00, 15.00),
+		flatPriceAsOf("claude-haiku-4-5*", 1.00, 5.00, "2026-08-28"),
 		flatPrice("claude-haiku*", 0.25, 1.25),
 	},
 	"deepseek": {

internal/ai/cost/pricing_anthropic_test.go

@@ -0,0 +1,50 @@
+package cost
+
+import "testing"
+
+func TestLookupPriceUsesCurrentAnthropicOpusPricing(t *testing.T) {
+	tests := []struct {
+		model  string
+		input  float64
+		output float64
+		asOf   string
+	}{
+		{model: "claude-opus-5", input: 5.00, output: 25.00, asOf: "2026-08-28"},
+		{model: "claude-opus-5-20260801", input: 5.00, output: 25.00, asOf: "2026-08-28"},
+		{model: "claude-opus-4-8", input: 5.00, output: 25.00, asOf: "2026-08-28"},
+		{model: "claude-opus-4-7", input: 5.00, output: 25.00, asOf: "2026-08-28"},
+		{model: "claude-opus-4-6", input: 5.00, output: 25.00, asOf: "2026-08-28"},
+		{model: "claude-opus-4-5-20251101", input: 5.00, output: 25.00, asOf: "2026-08-28"},
+		{model: "claude-opus-4-1-20250805", input: 15.00, output: 75.00, asOf: pricingAsOf},
+		{model: "claude-opus-4-20250514", input: 15.00, output: 75.00, asOf: pricingAsOf},
+		{model: "claude-opus-20240229", input: 15.00, output: 75.00, asOf: pricingAsOf},
+	}
+
+	for _, test := range tests {
+		t.Run(test.model, func(t *testing.T) {
+			price, ok := lookupPrice("anthropic", test.model, 50_000)
+			if !ok {
+				t.Fatal("expected Anthropic Opus pricing to resolve")
+			}
+			if price.InputUSDPerMTok != test.input || price.OutputUSDPerMTok != test.output {
+				t.Fatalf("unexpected Anthropic Opus price: %+v", price)
+			}
+			if price.AsOf != test.asOf {
+				t.Fatalf("Anthropic Opus pricing date = %q, want %q", price.AsOf, test.asOf)
+			}
+		})
+	}
+}
+
+func TestLookupPriceUsesCurrentAnthropicHaiku45Pricing(t *testing.T) {
+	price, ok := lookupPrice("anthropic", "claude-haiku-4-5-20251001", 50_000)
+	if !ok {
+		t.Fatal("expected Anthropic Haiku 4.5 pricing to resolve")
+	}
+	if price.InputUSDPerMTok != 1.00 || price.OutputUSDPerMTok != 5.00 {
+		t.Fatalf("unexpected Anthropic Haiku 4.5 price: %+v", price)
+	}
+	if price.AsOf != "2026-08-28" {
+		t.Fatalf("Anthropic Haiku 4.5 pricing date = %q, want 2026-08-28", price.AsOf)
+	}
+}