Distinguish gpt-5.3-codex-spark from base GPT-5.3 Codex label (#539)

gpt-5.3-codex-spark is a distinct model variant, but the longest-first
startsWith(key+'-') matcher (intended for reasoning suffixes -high/-low)
swept it into the base 'GPT-5.3 Codex' label, making a distinct model look
like the retired base in today/models/status output. Add an explicit
display entry in SHORT_NAMES and the codex provider so the longer key wins;
-high/-low still fall through to the base. Pricing is unaffected (LiteLLM
has no spark entry; cost falls back to the base rate as before).

Fixes #461

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',

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',

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')
   })

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', [