diff --git a/src/models.ts b/src/models.ts
index d45a8aa5..42d20e01 100644
--- a/src/models.ts
+++ b/src/models.ts
@@ -617,6 +617,7 @@ 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 9182800e..775126ec 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 40981c0a..490aa7b5 100644
--- a/tests/models.test.ts
+++ b/tests/models.test.ts
@@ -61,6 +61,12 @@ describe('getShortModelName', () => {
     expect(getShortModelName('claude-opus-4-8')).toBe('Opus 4.8')
   })
 
+  // Regression for #461: gpt-5.3-codex-spark must keep its own display name
+  // rather than collapsing into the shorter gpt-5.3-codex bucket.
+  it('maps gpt-5.3-codex-spark to its own line (not GPT-5.3 Codex)', () => {
+    expect(getShortModelName('gpt-5.3-codex-spark')).toBe('GPT-5.3 Codex Spark')
+  })
+
   // A future version is derived from the id with no hand-maintained entry.
   it('derives an unreleased claude version with no SHORT_NAMES entry', () => {
     expect(getShortModelName('claude-sonnet-5-2')).toBe('Sonnet 5.2')
diff --git a/tests/providers/codex.test.ts b/tests/providers/codex.test.ts
index 3ef4c30c..2f9b48c7 100644
--- a/tests/providers/codex.test.ts
+++ b/tests/providers/codex.test.ts
@@ -493,3 +493,15 @@ describe('codex provider - forked session dedupe', () => {
     expect(tokens).toBe(300)
   })
 })
+
+describe('codex provider - modelDisplayName', () => {
+  it('maps gpt-5.3-codex-spark to its own display name (not GPT-5.3 Codex) - fix #461', () => {
+    const provider = createCodexProvider('/nonexistent/path')
+    expect(provider.modelDisplayName('gpt-5.3-codex-spark')).toBe('GPT-5.3 Codex Spark')
+  })
+
+  it('still maps the base gpt-5.3-codex to GPT-5.3 Codex', () => {
+    const provider = createCodexProvider('/nonexistent/path')
+    expect(provider.modelDisplayName('gpt-5.3-codex')).toBe('GPT-5.3 Codex')
+  })
+})