Head-to-head comparison across 2benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Composer 2
73
Step 3.7 Flash
72
Pick Composer 2 if you want the stronger benchmark profile. Step 3.7 Flash only becomes the better choice if agentic is the priority or you want the cheaper token bill.
Agentic
+4.2 difference
Coding
+1.7 difference
Composer 2
Step 3.7 Flash
$0.5 / $2.5
$0.2 / $1.15
N/A
N/A
N/A
N/A
200K
256K
Pick Composer 2 if you want the stronger benchmark profile. Step 3.7 Flash only becomes the better choice if agentic is the priority or you want the cheaper token bill.
Composer 2 finishes one point ahead on BenchLM's provisional leaderboard, 73 to 72. That is enough to call, but not enough to treat as a blowout. This matchup comes down to a few meaningful edges rather than one model dominating the board.
Composer 2's sharpest advantage is in coding, where it averages 58 against 56.3. The single biggest benchmark swing on the page is Terminal-Bench 2.0, 61.7% to 59.5%. Step 3.7 Flash does hit back in agentic, so the answer changes if that is the part of the workload you care about most.
Composer 2 is also the more expensive model on tokens at $0.50 input / $2.50 output per 1M tokens, versus $0.20 input / $1.15 output per 1M tokens for Step 3.7 Flash. That is roughly 2.2x on output cost alone. Step 3.7 Flash gives you the larger context window at 256K, compared with 200K for Composer 2.
Composer 2 is ahead on BenchLM's provisional leaderboard, 73 to 72. The biggest single separator in this matchup is Terminal-Bench 2.0, where the scores are 61.7% and 59.5%.
Composer 2 has the edge for coding in this comparison, averaging 58 versus 56.3. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
Step 3.7 Flash has the edge for agentic tasks in this comparison, averaging 65.9 versus 61.7. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
For engineers, researchers, and the plain curious — a weekly brief on new models, ranking shifts, and pricing changes.
Free. No spam. Unsubscribe anytime.