Claude Opus 4.8 vs Grok 4.5 for CV writing
Claude Opus 4.8 wins, 93–88
Same 12 CV writing tasks, marked blind by three rival labs. Claude Opus 4.8 took 7 tasks, Grok 4.5 took 2, 3 tied. Tested 16 Aug 2026.
Where they differed most
The job ad: 'Customer Service Team Leader, Bradford, £27,500. You'll lead a team of six handling phone and email queries in a fast-paced environment, own complaint escalations, and report weekly numbers to the ops manager. We want someone customer-obsessed with rock-solid Excel.' The applicant: 4 years at a utilities call centre, 18 months as senior agent covering team-lead shifts, built the team's sickness-cover rota in Excel, 94% complaint resolution rate. Write ONLY the CV personal profile (max 60 words) tailored to this ad — evidence over adjectives, and do not parrot the ad's own phrases: banned 'fast-paced environment', 'customer-obsessed'.
Customer service professional with 4 years' call-centre experience, including 18 months as senior agent stepping up to cover team-lead shifts. Achieved a 94% complaint resolution rate handling escalations across phone and email. Built the team's sickness-cover rota in Excel, and comfortable tracking and reporting weekly performance figures to management.
Customer service professional with 4 years in a utilities call centre, including 18 months as senior agent covering team-lead shifts. Built the team’s sickness-cover rota in Excel. Delivered 94% complaint resolution while handling phone/email queries, owning escalations and supplying weekly performance figures.
Task by task
| Task | Claude Opus 4.8 | Grok 4.5 |
|---|---|---|
| Profile that mirrors the ad | 10 | 8 |
| Untangle the dates | 9 | 8 |
| Duties into achievements | 10 | 9 |
| Thirty years onto two pages | 10 | 8 |
| Profile without the wallpaper | 8 | 9 |
| First CV, empty history | 10 | 8 |
| Back after eight years | 10 | 10 |
| Do the hobbies earn their line? | 8 | 10 |
| Fix the format | 9 | 9 |
| The Excel question | 9 | 8 |
| Strip the header | 9 | 8 |
| Refuse the invented job | 10 | 10 |
Full receipts: Claude Opus 4.8, Grok 4.5 · judges gemini-3.1-pro-preview, gpt-5.6-terra, grok-4.5
Questions people ask
Which is better for CV writing: Claude Opus 4.8 or Grok 4.5?
Claude Opus 4.8 — it scored 93/100 against 88/100 on our 12-task CV writing suite, winning 7 tasks to 2 with 3 tied. Every answer was marked blind by three judges from three rival AI labs.
How was this tested?
Both models answered the identical published CV writing tasks. Three AI judges from three different labs scored every answer blind against a fixed rubric; mechanically checkable rules (word limits, banned phrases) are enforced by the test harness in code. The raw outputs and judge verdicts are downloadable.
More CV writing head-to-heads: Claude Opus 4.8 vs GPT-5.5 · GPT-5.5 vs Grok 4.5 · Claude Opus 4.8 vs GPT-5.3-Codex · GPT-5.3-Codex vs Grok 4.5 · Claude Opus 4.8 vs GPT-5.6 Sol · Claude Fable 5 vs Claude Opus 4.8
Full ranking: Best AI for CV writing · model pages: Claude Opus 4.8, Grok 4.5