diff --git a/.stats.yml b/.stats.yml
index 7fd34a6..2ab7577 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,4 +1,4 @@
 configured_endpoints: 16
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/opencode%2Fopencode-3c79948402e96d2aae6e46095db2cf80759750d1b042d6f91281a72c415b14de.yml
-openapi_spec_hash: f9c2fc5988f0a30397929995c2be2c85
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/opencode%2Fopencode-129afed79c2ff0ae5f660a17af692c0f716b0d61ce62700f107c1d905346793e.yml
+openapi_spec_hash: 4bc73b4bfb67367575ac7b582b77d912
 config_hash: 61e8ad6b1bd35aec38a7b20a2570b967
diff --git a/session.go b/session.go
index 4476b2f..449bf17 100644
--- a/session.go
+++ b/session.go
@@ -1330,7 +1330,8 @@ type SessionChatParams struct {
 	ModelID    param.Field[string]                  `json:"modelID,required"`
 	Parts      param.Field[[]MessagePartUnionParam] `json:"parts,required"`
 	ProviderID param.Field[string]                  `json:"providerID,required"`
-	SessionID  param.Field[string]                  `json:"sessionID,required"`
+	// Session ID
+	SessionID param.Field[string] `json:"sessionID,required"`
 }
 
 func (r SessionChatParams) MarshalJSON() (data []byte, err error) {