From 2005788fc39681a846feb84006cbb76b7bd1b68f Mon Sep 17 00:00:00 2001
From: Luis Pater <webmaster@idotorg.org>
Date: Wed, 19 Aug 2026 21:28:39 +0800
Subject: [PATCH] =?UTF-8?q?fix(codex):=20filter=20out=20`prompt=5Fcache=5F?=
 =?UTF-8?q?retention`=20in=20OpenAI=E2=86=92Codex=20responses=20request=20?=
 =?UTF-8?q?conversion?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Closes: #5068
---
 .../codex_openai-responses_request.go         |  2 +-
 .../codex_openai-responses_request_test.go    | 26 +++++++++++++++++++
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/internal/translator/codex/openai/responses/codex_openai-responses_request.go b/internal/translator/codex/openai/responses/codex_openai-responses_request.go
index 6a759b3f0..ea617c23c 100644
--- a/internal/translator/codex/openai/responses/codex_openai-responses_request.go
+++ b/internal/translator/codex/openai/responses/codex_openai-responses_request.go
@@ -31,7 +31,7 @@ func ConvertOpenAIResponsesRequestToCodex(modelName string, inputRawJSON []byte,
 		rawJSON = deleteCodexRequestFields(rawJSON, "service_tier")
 	}
 
-	rawJSON = deleteCodexRequestFields(rawJSON, "truncation", "prompt_cache_options")
+	rawJSON = deleteCodexRequestFields(rawJSON, "truncation", "prompt_cache_options", "prompt_cache_retention")
 	rawJSON = stripCodexResponsesCacheBreakpoints(rawJSON)
 	rawJSON = applyResponsesCompactionCompatibility(rawJSON)
 
diff --git a/internal/translator/codex/openai/responses/codex_openai-responses_request_test.go b/internal/translator/codex/openai/responses/codex_openai-responses_request_test.go
index 493f288bd..60efdd290 100644
--- a/internal/translator/codex/openai/responses/codex_openai-responses_request_test.go
+++ b/internal/translator/codex/openai/responses/codex_openai-responses_request_test.go
@@ -253,6 +253,7 @@ func TestConvertOpenAIResponsesRequestToCodexNormalizesRequiredFields(t *testing
 		"service_tier":"standard",
 		"truncation":"auto",
 		"prompt_cache_options":{"mode":"implicit"},
+		"prompt_cache_retention":"24h",
 		"user":"request-owner",
 		"input":[{"type":"message","role":"system","content":"hello"}]
 	}`)
@@ -283,6 +284,7 @@ func TestConvertOpenAIResponsesRequestToCodexNormalizesRequiredFields(t *testing
 		"service_tier",
 		"truncation",
 		"prompt_cache_options",
+		"prompt_cache_retention",
 		"user",
 	} {
 		if gjson.GetBytes(output, path).Exists() {
@@ -291,6 +293,30 @@ func TestConvertOpenAIResponsesRequestToCodexNormalizesRequiredFields(t *testing
 	}
 }
 
+func TestConvertOpenAIResponsesRequestToCodex_FiltersPromptCacheRetention(t *testing.T) {
+	inputJSON := []byte(`{
+		"model": "gpt-5.6-terra",
+		"prompt_cache_retention": "24h",
+		"input": [
+			{
+				"type": "message",
+				"role": "user",
+				"content": [
+					{
+						"type": "input_text",
+						"text": "hello"
+					}
+				]
+			}
+		]
+	}`)
+
+	output := ConvertOpenAIResponsesRequestToCodex("gpt-5.6-terra", inputJSON, true)
+	if gjson.GetBytes(output, "prompt_cache_retention").Exists() {
+		t.Fatalf("prompt_cache_retention should be removed: %s", string(output))
+	}
+}
+
 // TestConvertSystemRoleToDeveloper_AssistantRole tests that assistant role is preserved
 func TestConvertSystemRoleToDeveloper_AssistantRole(t *testing.T) {
 	inputJSON := []byte(`{