@@ -7,6 +7,9 @@ import { prefetchCodexPricing } from './_macro.ts' with { type: 'macro' };
 import { logger } from './logger.ts';
 
 const CODEX_PROVIDER_PREFIXES = ['openai/', 'azure/', 'openrouter/openai/'];
+const CODEX_MODEL_ALIASES: Record<string, string> = {
+	'gpt-5-codex': 'gpt-5',
+};
 
 function toPerMillion(value: number | undefined, fallback?: number): number {
 	const perToken = value ?? fallback ?? 0;
@@ -37,21 +40,26 @@ export class CodexPricingSource implements PricingSource, Disposable {
 	}
 
 	async getPricing(model: string): Promise<ModelPricing> {
-		const pricingResult = await this.fetcher.getModelPricing(model);
-		if (Result.isFailure(pricingResult)) {
-			throw pricingResult.error;
-		}
+		const alias = CODEX_MODEL_ALIASES[model];
+		const lookupCandidates = Array.from(new Set([model, alias].filter((candidate): candidate is string => candidate != null)));
+
+		for (const candidate of lookupCandidates) {
+			const pricingResult = await this.fetcher.getModelPricing(candidate);
+			if (Result.isFailure(pricingResult)) {
+				throw pricingResult.error;
+			}
 
-		const pricing = pricingResult.value;
-		if (pricing == null) {
-			throw new Error(`Pricing not found for model ${model}`);
+			const pricing = pricingResult.value;
+			if (pricing != null) {
+				return {
+					inputCostPerMToken: toPerMillion(pricing.input_cost_per_token),
+					cachedInputCostPerMToken: toPerMillion(pricing.cache_read_input_token_cost, pricing.input_cost_per_token),
+					outputCostPerMToken: toPerMillion(pricing.output_cost_per_token),
+				};
+			}
 		}
 
-		return {
-			inputCostPerMToken: toPerMillion(pricing.input_cost_per_token),
-			cachedInputCostPerMToken: toPerMillion(pricing.cache_read_input_token_cost, pricing.input_cost_per_token),
-			outputCostPerMToken: toPerMillion(pricing.output_cost_per_token),
-		};
+		throw new Error(`Pricing not found for model ${model}`);
 	}
 }
 
@@ -69,7 +77,7 @@ if (import.meta.vitest != null) {
 				}),
 			});
 
-			const pricing = await source.getPricing('gpt-5');
+			const pricing = await source.getPricing('gpt-5-codex');
 			expect(pricing.inputCostPerMToken).toBeCloseTo(1.25);
 			expect(pricing.outputCostPerMToken).toBeCloseTo(10);
 			expect(pricing.cachedInputCostPerMToken).toBeCloseTo(0.125);