Head-to-head comparison across 2benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Kimi K2.5 (Reasoning)
76
Step 3.7 Flash
72
Pick Kimi K2.5 (Reasoning) 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
+11.3 difference
Coding
+20.5 difference
Kimi K2.5 (Reasoning)
Step 3.7 Flash
$0.6 / $3
$0.2 / $1.15
N/A
N/A
N/A
N/A
128K
256K
Pick Kimi K2.5 (Reasoning) 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.
Kimi K2.5 (Reasoning) is clearly ahead on the provisional aggregate, 76 to 72. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Kimi K2.5 (Reasoning)'s sharpest advantage is in coding, where it averages 76.8 against 56.3. The single biggest benchmark swing on the page is BrowseComp, 60.6% to 75.8%. 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.
Kimi K2.5 (Reasoning) is also the more expensive model on tokens at $0.60 input / $3.00 output per 1M tokens, versus $0.20 input / $1.15 output per 1M tokens for Step 3.7 Flash. That is roughly 2.6x on output cost alone. Step 3.7 Flash gives you the larger context window at 256K, compared with 128K for Kimi K2.5 (Reasoning).
Kimi K2.5 (Reasoning) is ahead on BenchLM's provisional leaderboard, 76 to 72. The biggest single separator in this matchup is BrowseComp, where the scores are 60.6% and 75.8%.
Kimi K2.5 (Reasoning) has the edge for coding in this comparison, averaging 76.8 versus 56.3. Step 3.7 Flash stays close enough that the answer can still flip depending on your workload.
Step 3.7 Flash has the edge for agentic tasks in this comparison, averaging 65.9 versus 54.6. Inside this category, Gert Labs 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.