diff --git a/README.md b/README.md
index 6f0d384..5e00d4e 100644
--- a/README.md
+++ b/README.md
@@ -106,7 +106,7 @@ Usage:
 Flags:
   -c, --config string   path to configuration file in JSON format (default "gemini_cli_config.json")
   -h, --help            help for this command
-  -m, --model string    generative model name (default "gemini-pro")
+  -m, --model string    generative model name (default "gemini-1.5-flash")
       --multiline       read input as a multi-line string
   -s, --style string    markdown format style (ascii, dark, light, pink, notty, dracula) (default "auto")
   -t, --term string     multi-line input terminator (default "$")
diff --git a/gemini/chat_session.go b/gemini/chat_session.go
index 62fb331..4f6e6e2 100644
--- a/gemini/chat_session.go
+++ b/gemini/chat_session.go
@@ -10,7 +10,7 @@ import (
 	"google.golang.org/api/option"
 )
 
-const DefaultModel = "gemini-pro"
+const DefaultModel = "gemini-1.5-flash"
 
 // ChatSession represents a gemini powered chat session.
 type ChatSession struct {