diff --git a/packages/ai/CHANGELOG.md b/packages/ai/CHANGELOG.md
index 7abafe10..e41da3a6 100644
--- a/packages/ai/CHANGELOG.md
+++ b/packages/ai/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Changed
+
+- Changed OpenAI Codex Responses default text verbosity to `low` when no verbosity is specified.
+
 ### Fixed
 
 - Fixed OpenAI-compatible prompt cache tests to cover proxies that explicitly disable long cache retention.
diff --git a/packages/ai/src/providers/openai-codex-responses.ts b/packages/ai/src/providers/openai-codex-responses.ts
index 74b90d1c..541cb98a 100644
--- a/packages/ai/src/providers/openai-codex-responses.ts
+++ b/packages/ai/src/providers/openai-codex-responses.ts
@@ -325,7 +325,7 @@ function buildRequestBody(
 		stream: true,
 		instructions: context.systemPrompt,
 		input: messages,
-		text: { verbosity: options?.textVerbosity || "medium" },
+		text: { verbosity: options?.textVerbosity || "low" },
 		include: ["reasoning.encrypted_content"],
 		prompt_cache_key: options?.sessionId,
 		tool_choice: "auto",