diff --git a/go.mod b/go.mod
index a00d567c9e..a7f0fe9912 100644
--- a/go.mod
+++ b/go.mod
@@ -83,8 +83,8 @@ replace github.com/spf13/afero => github.com/aslilac/afero v0.0.0-20250403163713
 // 4) (anthropic-sdk-go) dannykopping's appendCompact performance fixes
 // 5) (anthropic-sdk-go) DirectEncoder to eliminate nested MarshalJSON allocation chain
 // 6) Anthropic EffortXHigh constant for Claude Opus 4.7
-// See: https://github.com/coder/fantasy/commits/959aa39579d2
-replace charm.land/fantasy => github.com/coder/fantasy v0.0.0-20260416152503-959aa39579d2
+// See: https://github.com/coder/fantasy/commits/5ab464a305f4
+replace charm.land/fantasy => github.com/coder/fantasy v0.0.0-20260424191546-5ab464a305f4
 
 // coder/coder uses a fork of charmbracelet's fork of the Anthropic Go SDK with some
 // additional performance improvements.
diff --git a/go.sum b/go.sum
index 21c919e00b..58b252d8fe 100644
--- a/go.sum
+++ b/go.sum
@@ -322,8 +322,8 @@ github.com/coder/bubbletea v1.2.2-0.20241212190825-007a1cdb2c41 h1:SBN/DA63+ZHwu
 github.com/coder/bubbletea v1.2.2-0.20241212190825-007a1cdb2c41/go.mod h1:I9ULxr64UaOSUv7hcb3nX4kowodJCVS7vt7VVJk/kW4=
 github.com/coder/clistat v1.2.1 h1:P9/10njXMyj5cWzIU5wkRsSy5LVQH49+tcGMsAgWX0w=
 github.com/coder/clistat v1.2.1/go.mod h1:m7SC0uj88eEERgvF8Kn6+w6XF21BeSr+15f7GoLAw0A=
-github.com/coder/fantasy v0.0.0-20260416152503-959aa39579d2 h1:bZoww6da3tFbiYHLgIZuRNTMgsiQDSgblDMSOSmmlzE=
-github.com/coder/fantasy v0.0.0-20260416152503-959aa39579d2/go.mod h1:wZ0e3lEPqrM0XiIdAUQLvMKCLYhc3gi96MRX2wjbX44=
+github.com/coder/fantasy v0.0.0-20260424191546-5ab464a305f4 h1:eL6f03ujlQiXs24FjAtdyD8TMbRiZtDWj6JdcSlMeUw=
+github.com/coder/fantasy v0.0.0-20260424191546-5ab464a305f4/go.mod h1:wZ0e3lEPqrM0XiIdAUQLvMKCLYhc3gi96MRX2wjbX44=
 github.com/coder/flog v1.1.0 h1:kbAes1ai8fIS5OeV+QAnKBQE22ty1jRF/mcAwHpLBa4=
 github.com/coder/flog v1.1.0/go.mod h1:UQlQvrkJBvnRGo69Le8E24Tcl5SJleAAR7gYEHzAmdQ=
 github.com/coder/go-httpstat v0.0.0-20230801153223-321c88088322 h1:m0lPZjlQ7vdVpRBPKfYIFlmgevoTkBxB10wv6l2gOaU=