From 5b69636c3527993ca267cc74383bbcd8fc9a461c Mon Sep 17 00:00:00 2001
From: "itarun.p" <itarun.p@somapait.com>
Date: Sat, 22 Aug 2026 21:43:37 +0700
Subject: [PATCH] fix(pricing): resolve fable/mythos canary variants via fuzzy
 match
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claude-auto-pilot-fable-v1-canary and claude-mythos-*-canary model ids
wrap the pinned claude-fable-5/claude-mythos-5 names with extra
prefix/suffix segments (auto-pilot-, -v1-canary), so "fable"/"mythos"
is not a contiguous substring of the curated exact key. Every
non-fuzzy resolution tier in matcher.js requires a contiguous
substring match, so these ids fell through to miss and billed $0 —
the dashboard hid the cost column entirely (formatCost() returns null
for cost <= 0).

Add curated fuzzy rules for "fable" and "mythos", matching the
existing kiro/hy3/composer fuzzy pattern.

Fixes #187
---
 src/lib/pricing/curated-overrides.json |  2 ++
 test/pricing.test.js                   | 10 ++++++++++
 2 files changed, 12 insertions(+)

diff --git a/src/lib/pricing/curated-overrides.json b/src/lib/pricing/curated-overrides.json
index b575bbdfc..076a58c22 100644
--- a/src/lib/pricing/curated-overrides.json
+++ b/src/lib/pricing/curated-overrides.json
@@ -68,6 +68,8 @@
     { "match": "kiro",                   "ref": "kiro-cli-agent" },
     { "match": "hy3",                    "ref": "hy3-preview-agent" },
     { "match": "composer",               "ref": "composer-1" },
+    { "match": "fable",                  "ref": "claude-fable-5" },
+    { "match": "mythos",                 "ref": "claude-mythos-5" },
     { "match": "minimax-m2.7-highspeed", "ref": "MiniMax-M2.7-highspeed" },
     { "match": "minimax-m2.7",           "ref": "MiniMax-M2.7" },
     { "match": "deepseek-v4-flash",      "ref": "deepseek-v4-flash" },
diff --git a/test/pricing.test.js b/test/pricing.test.js
index 72984b1ae..5884df39e 100644
--- a/test/pricing.test.js
+++ b/test/pricing.test.js
@@ -475,6 +475,16 @@ test("index: getModelPricing pins Claude Fable/Mythos 5 pricing from curated ove
     assert.equal(pinned.cache_write, 12.5);
   }
 
+  // Regression (issue #187): auto-pilot/canary variants wrap the pinned name
+  // with extra prefix/suffix segments (e.g. "claude-auto-pilot-fable-v1-canary"),
+  // so "fable"/"mythos" is not a contiguous substring of "claude-fable-5"/
+  // "claude-mythos-5" — every non-fuzzy resolution tier misses on these ids.
+  for (const model of ["claude-auto-pilot-fable-v1-canary", "claude-mythos-v1-canary"]) {
+    const pinned = pricing.getModelPricing(model);
+    assert.equal(pinned.input, 10, `${model} should resolve to the Fable/Mythos pin`);
+    assert.equal(pinned.output, 50, `${model} should resolve to the Fable/Mythos pin`);
+  }
+
   assert.equal(
     pricing.computeRowCost({
       source: "claude",