Claude Opus 4.8 vs Grok 4.20 (Beta Reasoning)
Wins 3 of 3 areas
Coding · Reasoning · Images and charts
Wins 0 of 3 areas
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Claude Opus 4.8 is the stronger all-rounder.
Scores updated · 4 tests both models report · How we compare
Where each one wins
Tests won in each of the three areas where both have results. Each piece is one test, so a longer bar means more evidence; grey means the two scored within a point of each other.
Coding, reasoning and images and charts rest on a single test each.
What it costs
Prices per million tokens, roughly 750,000 words. The bars show the cost of a million tokens read plus a million written.
The biggest differences
The tests each model wins by the widest margin, up to three each. Scores are out of 100.
Where Claude Opus 4.8 pulls ahead
- Solves new puzzle games it has never seenARC-AGI-3+1.4points ahead
Where Grok 4.20 (Beta Reasoning) pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 4 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Opus 4.8
- LMArena · WebDevClaude Opus 4.8 by 181 rating points15561375+181 rating
Images and chartsClaude Opus 4.8
- LMArena · VisionClaude Opus 4.8 by 32 rating points12951263+32 rating
Other results1 test, not counted
Tests outside the eight areas. They are not counted above: several are summary scores built from other tests, or the same test under another name.
- Finance Agent v2Claude Opus 4.8 by 25.453.928.5+25.4
Questions people ask
Which is better, Claude Opus 4.8 or Grok 4.20 (Beta Reasoning)?
Claude Opus 4.8 wins all three areas where both have results: coding, reasoning and images and charts. Grok 4.20 (Beta Reasoning) wins none.
Which is better for coding?
Claude Opus 4.8. It wins the one coding test both models report.
How do you compare the two?
We use the 4 benchmark tests both models have published scores on. The verdict counts the 3 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 1 are listed but not counted, because several are summary scores or repeat a test. Each score is the one shown on the model's own page.