Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Claude Opus 4.5
76
Grok Code Fast 1
39
Verified leaderboard positions: Claude Opus 4.5 #13 · Grok Code Fast 1 unranked
Pick Claude Opus 4.5 if you want the stronger benchmark profile. Grok Code Fast 1 only becomes the better choice if coding is the priority or you want the cheaper token bill.
Coding
+4.9 difference
Claude Opus 4.5
Grok Code Fast 1
$5 / $25
$0.2 / $1.5
46 t/s
172 t/s
1.01s
2.81s
200K
256K
Pick Claude Opus 4.5 if you want the stronger benchmark profile. Grok Code Fast 1 only becomes the better choice if coding is the priority or you want the cheaper token bill.
Claude Opus 4.5 is clearly ahead on the provisional aggregate, 76 to 39. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude Opus 4.5 is also the more expensive model on tokens at $5.00 input / $25.00 output per 1M tokens, versus $0.20 input / $1.50 output per 1M tokens for Grok Code Fast 1. That is roughly 16.7x on output cost alone. Grok Code Fast 1 gives you the larger context window at 256K, compared with 200K for Claude Opus 4.5.
Claude Opus 4.5 is ahead on BenchLM's provisional leaderboard, 76 to 39. The biggest single separator in this matchup is SWE-bench Verified, where the scores are 80.9% and 70.8%.
Grok Code Fast 1 has the edge for coding in this comparison, averaging 70.8 versus 65.9. Inside this category, Terminal-Bench Hard is the benchmark that creates the most daylight between them.
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