diff --git a/src/agents/live-cache-regression-runner.ts b/src/agents/live-cache-regression-runner.ts
index fa9970eb992..7cdedadaf36 100644
--- a/src/agents/live-cache-regression-runner.ts
+++ b/src/agents/live-cache-regression-runner.ts
@@ -24,7 +24,7 @@ const OPENAI_TIMEOUT_MS = 120_000;
 const ANTHROPIC_TIMEOUT_MS = 120_000;
 const LIVE_CACHE_LANE_RETRIES = 1;
 const LIVE_CACHE_RESPONSE_RETRIES = 2;
-const OPENAI_CACHE_REASONING = "minimal" as unknown as never;
+const OPENAI_CACHE_REASONING = "none" as unknown as never;
 const OPENAI_CACHE_PROBE_MIN_MAX_TOKENS = 1024;
 const ANTHROPIC_CACHE_PROBE_MIN_MAX_TOKENS = 1024;
 const OPENAI_PREFIX = buildStableCachePrefix("openai");