From f44074df7f269cf57c5d8f247da712ec3143c671 Mon Sep 17 00:00:00 2001
From: Daniel Brunsdon <dan.brunsdon@gmail.com>
Date: Tue, 7 Jul 2026 17:57:35 +0000
Subject: [PATCH] feat(pricing): add Claude Sonnet 5 intro pricing entry

Sonnet 5 launched 2026-06-30 with introductory pricing ($2/$10 per
MTok input/output) through 2026-08-31, after which it reverts to
$3/$15. The model had no entry in the official-docs pricing snapshot,
so any session on claude-sonnet-5 was tracked as cost_status=unknown
with $0 estimated cost -- silently hiding real spend from
hermes insights and any downstream cost sync.

Source: https://platform.claude.com/docs/en/about-claude/pricing
---
 agent/usage_pricing.py | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/agent/usage_pricing.py b/agent/usage_pricing.py
index 18b3e204308d..31baee0a8ef9 100644
--- a/agent/usage_pricing.py
+++ b/agent/usage_pricing.py
@@ -179,6 +179,23 @@ _OFFICIAL_DOCS_PRICING: Dict[tuple[str, str], PricingEntry] = {
         source_url="https://openrouter.ai/anthropic/claude-opus-4.8-fast",
         pricing_version="anthropic-pricing-2026-05",
     ),
+    # ── Anthropic Claude Sonnet 5 ────────────────────────────────────────
+    # Launched 2026-06-30. Introductory pricing ($2/$10 per MTok) runs
+    # through 2026-08-31, after which it reverts to $3/$15 (matching
+    # Sonnet 4.6). Update this entry when the intro window closes.
+    # Source: https://platform.claude.com/docs/en/about-claude/pricing
+    (
+        "anthropic",
+        "claude-sonnet-5",
+    ): PricingEntry(
+        input_cost_per_million=Decimal("2.00"),
+        output_cost_per_million=Decimal("10.00"),
+        cache_read_cost_per_million=Decimal("0.20"),
+        cache_write_cost_per_million=Decimal("2.50"),
+        source="official_docs_snapshot",
+        source_url="https://platform.claude.com/docs/en/about-claude/pricing",
+        pricing_version="anthropic-pricing-2026-06-intro",
+    ),
     # ── Anthropic Claude 4.7 ─────────────────────────────────────────────
     # Opus 4.5/4.6/4.7 share $5/$25 pricing (new tokenizer, up to 35% more
     # tokens for the same text).