fix: coerce pro minimal effort to medium

Author: ndycode

lib/request/request-transformer.ts

@@ -612,7 +612,7 @@ export function getReasoningConfig(
 	// GPT-5.4 Pro only supports medium/high/xhigh reasoning.
 	// originalRequestedEffort is a non-sensitive model setting string, not a token.
 	// Logging this coercion does not introduce new redaction or filesystem-race risk.
-	if (isGpt54Pro && effort === "low") {
+	if (isGpt54Pro && (effort === "low" || effort === "minimal")) {
 		logWarn(
 			`GPT-5.4 Pro supports medium/high/xhigh only; coercing '${originalRequestedEffort}' to 'medium'`,
 		);

test/property/transformer.property.test.ts

@@ -244,6 +244,16 @@ describe("getReasoningConfig property tests", () => {
 	    );
   });
 
+	  it("gpt-5.4-pro upgrades minimal to medium", () => {
+	    fc.assert(
+	      fc.property(fc.constant("gpt-5.4-pro"), (model) => {
+	        const result = getReasoningConfig(model, { reasoningEffort: "minimal" });
+	        expect(result.effort).toBe("medium");
+	        return true;
+	      })
+	    );
+	  });
+
   it("gpt-5.1, gpt-5.2, and gpt-5.4 general support none effort", () => {
     fc.assert(
       fc.property(

test/request-transformer.test.ts

@@ -1518,6 +1518,19 @@ describe('Request Transformer Module', () => {
 			expect(result.reasoning?.effort).toBe('medium');
 		});
 
+		it('should coerce minimal to medium for gpt-5.4-pro', async () => {
+			const body: RequestBody = {
+				model: 'gpt-5.4-pro',
+				input: [],
+			};
+			const userConfig: UserConfig = {
+				global: { reasoningEffort: 'minimal' },
+				models: {},
+			};
+			const result = await transformRequestBody(body, codexInstructions, userConfig);
+			expect(result.reasoning?.effort).toBe('medium');
+		});
+
 		it('should default codex-max to high effort', async () => {
 			const body: RequestBody = {
 				model: 'gpt-5.1-codex-max',