Head-to-head comparison across 2benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Claude Opus 4.8
93
Step 3.7 Flash
72
Verified leaderboard positions: Claude Opus 4.8 #3 · Step 3.7 Flash unranked
Pick Claude Opus 4.8 if you want the stronger benchmark profile. Step 3.7 Flash only becomes the better choice if you want the cheaper token bill.
Agentic
+14.2 difference
Coding
+20.1 difference
Claude Opus 4.8
Step 3.7 Flash
$5 / $25
$0.2 / $1.15
N/A
N/A
N/A
N/A
1M
256K
Pick Claude Opus 4.8 if you want the stronger benchmark profile. Step 3.7 Flash only becomes the better choice if you want the cheaper token bill.
Claude Opus 4.8 is clearly ahead on the provisional aggregate, 93 to 72. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude Opus 4.8's sharpest advantage is in coding, where it averages 76.4 against 56.3. The single biggest benchmark swing on the page is Terminal-Bench 2.0, 74.6% to 59.5%.
Claude Opus 4.8 is also the more expensive model on tokens at $5.00 input / $25.00 output per 1M tokens, versus $0.20 input / $1.15 output per 1M tokens for Step 3.7 Flash. That is roughly 21.7x on output cost alone. Claude Opus 4.8 gives you the larger context window at 1M, compared with 256K for Step 3.7 Flash.
Claude Opus 4.8 is ahead on BenchLM's provisional leaderboard, 93 to 72. The biggest single separator in this matchup is Terminal-Bench 2.0, where the scores are 74.6% and 59.5%.
Claude Opus 4.8 has the edge for coding in this comparison, averaging 76.4 versus 56.3. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
Claude Opus 4.8 has the edge for agentic tasks in this comparison, averaging 80.1 versus 65.9. Inside this category, Gert Labs is the benchmark that creates the most daylight between them.
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