Claude Opus 4.5
VS
Grok 4.20 Beta
Claude Opus 4.5 vs Grok 4.20 Beta: which wins at real work?
22 task areas · same graded test runs · rank comparison only, so 0–100 and Elo collections never mix raw scores.
Claude Opus 4.5 wins 20 of 22 task areas we tested; Grok 4.20 Beta takes 2. Grok 4.20 Beta costs 3.8× less per token ($8 vs $30 per 1M).
Grok 4.20 Beta costs 3.8× less per token ($8 vs $30 per 1M).
Task by task
| Task area | Claude Opus 4.5 | Grok 4.20 Beta | Winner |
|---|---|---|---|
| Summarization & Meeting Notes |
#1
/ 110
Excellent
|
#95
/ 110
Excellent
|
Claude Opus 4.5 |
| Translation & Localization |
#5
/ 110
Excellent
|
#90
/ 110
Strong
|
Claude Opus 4.5 |
| Creative & Comedy | #8 / 110 | #92 / 110 | Claude Opus 4.5 |
| Data & Analytics |
#9
/ 110
Excellent
|
#91
/ 110
Excellent
|
Claude Opus 4.5 |
| Content & Brand |
#21
/ 124
Strong
|
#99
/ 124
Usable
|
Claude Opus 4.5 |
| Legal & HR |
#30
/ 110
Excellent
|
#106
/ 110
Strong
|
Claude Opus 4.5 |
| Research & Competitive Analysis |
#17
/ 110
Excellent
|
#86
/ 110
Needs editing
|
Claude Opus 4.5 |
| Executive Assistant |
#4
/ 112
Strong
|
#69
/ 112
Strong
|
Claude Opus 4.5 |
| Landing Pages |
#7
/ 72
Strong
|
#60
/ 72
Usable
|
Claude Opus 4.5 |
| Training & Education |
#24
/ 110
Excellent
|
#76
/ 110
Strong
|
Claude Opus 4.5 |
| Sales |
#3
/ 110
Strong
|
#46
/ 110
Usable
|
Claude Opus 4.5 |
| RAG, Safety & Grounding |
#52
/ 113
Excellent
|
#93
/ 113
Strong
|
Claude Opus 4.5 |
| Knowledge & Docs |
#47
/ 110
Strong
|
#86
/ 110
Usable
|
Claude Opus 4.5 |
| Structured Output |
#82
/ 113
Strong
|
#43
/ 113
Excellent
|
Grok 4.20 Beta |
| Coding |
#39
/ 115
Strong
|
#77
/ 115
Strong
|
Claude Opus 4.5 |
| AI Strategy |
#16
/ 126
Strong
|
#49
/ 126
Strong
|
Claude Opus 4.5 |
| Investor & Pitch |
#10
/ 66
Strong
|
#43
/ 66
Usable
|
Claude Opus 4.5 |
| Frontend & Landing Pages |
#2
/ 109
Usable
|
#32
/ 109
Needs editing
|
Claude Opus 4.5 |
| Product & Project Management |
#60
/ 110
Strong
|
#31
/ 110
Excellent
|
Grok 4.20 Beta |
| Chef / Home Cooking |
#14
/ 126
Strong
|
#38
/ 126
Usable
|
Claude Opus 4.5 |
| Customer Support |
#56
/ 113
Strong
|
#72
/ 113
Usable
|
Claude Opus 4.5 |
| Presentations & Decks |
#45
/ 110
Excellent
|
#56
/ 110
Strong
|
Claude Opus 4.5 |
Rank = position among every model config we tested in that task area (lower is better). Sorted by biggest gap first.
Frequently asked
Is Claude Opus 4.5 better than Grok 4.20 Beta?
Across 22 task areas we benchmarked, Claude Opus 4.5 ranks higher in 20 and Grok 4.20 Beta in 2.
Which is cheaper, Claude Opus 4.5 or Grok 4.20 Beta?
Grok 4.20 Beta costs 3.8× less per token ($8 vs $30 per 1M).
What is Claude Opus 4.5 better at?
Claude Opus 4.5 out-ranks Grok 4.20 Beta at Summarization & Meeting Notes, Translation & Localization, Creative & Comedy.
What is Grok 4.20 Beta better at?
Grok 4.20 Beta out-ranks Claude Opus 4.5 at Structured Output, Product & Project Management.
More comparisons
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Prompt × model results
12 test cases · 3 evals