diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7c75db3a7..95d2d83c4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 - Documented session lifetime, repository visibility refresh behavior, and how permission sync handles transient code-host errors. [#1218](https://github.com/sourcebot-dev/sourcebot/pull/1218)
 
+### Fixed
+- Fixed issue where claude-opus-4-8 was returning "error occurred "thinking.type.enabled" is not supported for this model". [#1249](https://github.com/sourcebot-dev/sourcebot/pull/1249)
+
 ## [4.17.3] - 2026-05-22
 
 ### Fixed
diff --git a/packages/web/src/features/chat/utils.server.ts b/packages/web/src/features/chat/utils.server.ts
index 9d00459f4..6c96e7f10 100644
--- a/packages/web/src/features/chat/utils.server.ts
+++ b/packages/web/src/features/chat/utils.server.ts
@@ -211,7 +211,8 @@ export const getAISDKLanguageModelAndOptions = async (config: LanguageModel): Pr
                 });
 
                 const isAdaptiveThinkingSupported =
-                    modelId.startsWith('claude-opus-4-7');
+                    modelId.startsWith('claude-opus-4-7') ||
+                    modelId.startsWith('claude-opus-4-8');
 
                 return {
                     model: anthropic(modelId),