diff --git a/cmd/generate_changelog/incoming/1783.txt b/cmd/generate_changelog/incoming/1783.txt
new file mode 100644
index 00000000..a05f1976
--- /dev/null
+++ b/cmd/generate_changelog/incoming/1783.txt
@@ -0,0 +1,5 @@
+### PR [#1783](https://github.com/danielmiessler/Fabric/pull/1783) by [ksylvan](https://github.com/ksylvan): Update anthropic-sdk-go and add claude-sonnet-4-5
+
+- Feat: update `anthropic-sdk-go` to v1.13.0 and add new model
+- Upgrade `anthropic-sdk-go` to version 1.13.0
+- Add `ModelClaudeSonnet4_5` to supported models list
diff --git a/go.mod b/go.mod
index 69eef36f..d624b4f7 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module github.com/danielmiessler/fabric
 go 1.25.1
 
 require (
-	github.com/anthropics/anthropic-sdk-go v1.12.0
+	github.com/anthropics/anthropic-sdk-go v1.13.0
 	github.com/atotto/clipboard v0.1.4
 	github.com/aws/aws-sdk-go-v2 v1.39.0
 	github.com/aws/aws-sdk-go-v2/config v1.31.8
diff --git a/go.sum b/go.sum
index 02780b4a..31c8ce0a 100644
--- a/go.sum
+++ b/go.sum
@@ -29,6 +29,8 @@ github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be h1:9AeTilPcZAjCFI
 github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be/go.mod h1:ySMOLuWl6zY27l47sB3qLNK6tF2fkHG55UZxx8oIVo4=
 github.com/anthropics/anthropic-sdk-go v1.12.0 h1:xPqlGnq7rWrTiHazIvCiumA0u7mGQnwDQtvA1M82h9U=
 github.com/anthropics/anthropic-sdk-go v1.12.0/go.mod h1:WTz31rIUHUHqai2UslPpw5CwXrQP3geYBioRV4WOLvE=
+github.com/anthropics/anthropic-sdk-go v1.13.0 h1:Bhbe8sRoDPtipttg8bQYrMCKe2b79+q6rFW1vOKEUKI=
+github.com/anthropics/anthropic-sdk-go v1.13.0/go.mod h1:WTz31rIUHUHqai2UslPpw5CwXrQP3geYBioRV4WOLvE=
 github.com/araddon/dateparse v0.0.0-20210429162001-6b43995a97de h1:FxWPpzIjnTlhPwqqXc4/vE0f7GvRjuAsbW+HOIe8KnA=
 github.com/araddon/dateparse v0.0.0-20210429162001-6b43995a97de/go.mod h1:DCaWoUhZrYW9p1lxo/cm8EmUOOzAPSEZNGF2DK1dJgw=
 github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5 h1:0CwZNZbxp69SHPdPJAN/hZIm0C4OItdklCFmMRWYpio=
diff --git a/internal/plugins/ai/anthropic/anthropic.go b/internal/plugins/ai/anthropic/anthropic.go
index 674d919c..07d5535e 100644
--- a/internal/plugins/ai/anthropic/anthropic.go
+++ b/internal/plugins/ai/anthropic/anthropic.go
@@ -49,10 +49,12 @@ func NewClient() (ret *Client) {
 		string(anthropic.ModelClaude_3_Opus_20240229), string(anthropic.ModelClaude_3_Haiku_20240307),
 		string(anthropic.ModelClaudeOpus4_20250514), string(anthropic.ModelClaudeSonnet4_20250514),
 		string(anthropic.ModelClaudeOpus4_1_20250805),
+		string(anthropic.ModelClaudeSonnet4_5),
 	}
 
 	ret.modelBetas = map[string][]string{
 		string(anthropic.ModelClaudeSonnet4_20250514): {"context-1m-2025-08-07"},
+		string(anthropic.ModelClaudeSonnet4_5):        {"context-1m-2025-08-07"},
 	}
 
 	return