diff --git a/frontend/src/lib/components/copilot/modelConfig.ts b/frontend/src/lib/components/copilot/modelConfig.ts
index c957e1a06e..2f6dd61a49 100644
--- a/frontend/src/lib/components/copilot/modelConfig.ts
+++ b/frontend/src/lib/components/copilot/modelConfig.ts
@@ -150,6 +150,11 @@ export function buildModelMatchers<T>(
 			// a shipped default; `gpt-5-preview-pro` would be a different one again).
 			// Off by default: for a context window an inherited value is a safe
 			// approximation, for a price it is a wrong number.
+			// A further revision segment (`gpt-5` vs `gpt-5-4-mini`) is a different model
+			// too, and the entry-ends-on-a-digit guard above does not catch it once the
+			// separator is normalized. Only a short segment: a date is digits as well
+			// (`-20251101`) and stays a decoration.
+			strictVariants ? '(?!-\\d{1,3}(?:$|-))' : '',
 			strictVariants
 				? `(?!-(?!(?:v\\d|${DECORATIVE_SUFFIXES.join('|')})$)[a-z])`
 				: ''
diff --git a/frontend/src/lib/components/copilot/modelPricing.test.ts b/frontend/src/lib/components/copilot/modelPricing.test.ts
index 6f0362f1d0..b873379679 100644
--- a/frontend/src/lib/components/copilot/modelPricing.test.ts
+++ b/frontend/src/lib/components/copilot/modelPricing.test.ts
@@ -36,6 +36,11 @@ describe('resolveModelPrice', () => {
 		expect(resolveModelPrice('openai', 'gpt-5-pro', undefined)).toBeUndefined()
 		expect(resolveModelPrice('openai', 'gpt-5.6', undefined)).toBeUndefined()
 		expect(resolveModelPrice('googleai', 'gemini-3.1', undefined)).toBeUndefined()
+		// A revision carrying a variant has to be caught by the matcher, not by an
+		// explicit entry: `gpt-5.4-mini` cannot match the `gpt-5.4` one (the `-mini`
+		// makes it a sub-model), so nothing but the guard stops it reaching `gpt-5`.
+		expect(resolveModelPrice('openai', 'gpt-5.4-mini', undefined)).toBeUndefined()
+		expect(resolveModelPrice('openai', 'gpt-5.5-pro', undefined)).toBeUndefined()
 	})
 
 	it('still resolves the route decorations that name the same model', () => {
@@ -43,6 +48,8 @@ describe('resolveModelPrice', () => {
 		// not sub-models. `claude-3-5-haiku-latest` is a shipped picker default, so
 		// unpricing it would silently disable cost tracking out of the box.
 		expect(resolveModelPrice('anthropic', 'claude-opus-4-5-20251101', undefined)?.price.input).toBe(5)
+		// The revision guard must not swallow a date, which is digits too.
+		expect(resolveModelPrice('openai', 'gpt-5-2026-01-01', undefined)?.price.input).toBe(1.25)
 		expect(
 			resolveModelPrice('bedrock', 'anthropic.claude-sonnet-4-6-20250101-v1:0', undefined)?.price
 				.input