diff --git a/src/models.ts b/src/models.ts
index d929edaf..4616261f 100644
--- a/src/models.ts
+++ b/src/models.ts
@@ -621,6 +621,7 @@ const SHORT_NAMES: Record<string, string> = {
   'gpt-5.4-nano': 'GPT-5.4 Nano',
   'gpt-5.4-mini': 'GPT-5.4 Mini',
   'gpt-5.4': 'GPT-5.4',
+  'gpt-5.3-codex-spark': 'GPT-5.3 Codex Spark',
   'gpt-5.3-codex': 'GPT-5.3 Codex',
   'gpt-5.3': 'GPT-5.3',
   'gpt-5.2-pro': 'GPT-5.2 Pro',
diff --git a/src/providers/codex.ts b/src/providers/codex.ts
index e41a58b2..8cadf0d8 100644
--- a/src/providers/codex.ts
+++ b/src/providers/codex.ts
@@ -16,6 +16,7 @@ const modelDisplayNames: Record<string, string> = {
   'gpt-5.5': 'GPT-5.5',
   'gpt-5.4-mini': 'GPT-5.4 Mini',
   'gpt-5.4': 'GPT-5.4',
+  'gpt-5.3-codex-spark': 'GPT-5.3 Codex Spark',
   'gpt-5.3-codex': 'GPT-5.3 Codex',
   'gpt-5.2-low': 'GPT-5.2 Low',
   'gpt-5.2': 'GPT-5.2',
diff --git a/tests/models.test.ts b/tests/models.test.ts
index 2943f2e3..29fe3b72 100644
--- a/tests/models.test.ts
+++ b/tests/models.test.ts
@@ -51,6 +51,18 @@ describe('getShortModelName', () => {
     expect(getShortModelName('gpt-5.4-mini')).toBe('GPT-5.4 Mini')
   })
 
+  // Regression for #461: spark is a distinct variant, not a reasoning suffix.
+  it('maps gpt-5.3-codex-spark to its own label (not GPT-5.3 Codex)', () => {
+    const name = getShortModelName('gpt-5.3-codex-spark')
+    expect(name).not.toBe('GPT-5.3 Codex')
+    expect(name).toBe('GPT-5.3 Codex Spark')
+  })
+
+  it('maps gpt-5.3-codex reasoning suffixes to the base label', () => {
+    expect(getShortModelName('gpt-5.3-codex-high')).toBe('GPT-5.3 Codex')
+    expect(getShortModelName('gpt-5.3-codex-low')).toBe('GPT-5.3 Codex')
+  })
+
   it('maps claude-opus-4-6 with date suffix', () => {
     expect(getShortModelName('claude-opus-4-6-20260205')).toBe('Opus 4.6')
   })
diff --git a/tests/providers/codex.test.ts b/tests/providers/codex.test.ts
index 2b7fb962..958139f8 100644
--- a/tests/providers/codex.test.ts
+++ b/tests/providers/codex.test.ts
@@ -105,6 +105,21 @@ async function writeSession(dir: string, date: string, filename: string, lines:
   return filePath
 }
 
+describe('codex provider - model display names', () => {
+  it('maps gpt-5.3-codex-spark to its own label', () => {
+    const provider = createCodexProvider(tmpDir)
+    const name = provider.modelDisplayName('gpt-5.3-codex-spark')
+    expect(name).not.toBe('GPT-5.3 Codex')
+    expect(name).toBe('GPT-5.3 Codex Spark')
+  })
+
+  it('maps gpt-5.3-codex reasoning suffixes to the base label', () => {
+    const provider = createCodexProvider(tmpDir)
+    expect(provider.modelDisplayName('gpt-5.3-codex-high')).toBe('GPT-5.3 Codex')
+    expect(provider.modelDisplayName('gpt-5.3-codex-low')).toBe('GPT-5.3 Codex')
+  })
+})
+
 describe('codex provider - session discovery', () => {
   it('discovers sessions in YYYY/MM/DD structure', async () => {
     await writeSession(tmpDir, '2026-04-14', 'rollout-abc123.jsonl', [