Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
GPT-5.5 Pro
100
LFM2.5-8B-A1B
50
Pick GPT-5.5 Pro if you want the stronger benchmark profile. LFM2.5-8B-A1B only becomes the better choice if mathematics is the priority or you want the cheaper token bill.
Math
+7.5 difference
GPT-5.5 Pro
LFM2.5-8B-A1B
$30 / $180
$0 / $0
N/A
N/A
N/A
N/A
1M
128K
Pick GPT-5.5 Pro if you want the stronger benchmark profile. LFM2.5-8B-A1B only becomes the better choice if mathematics is the priority or you want the cheaper token bill.
GPT-5.5 Pro is clearly ahead on the provisional aggregate, 100 to 50. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.5 Pro is also the more expensive model on tokens at $30.00 input / $180.00 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for LFM2.5-8B-A1B. That is roughly Infinityx on output cost alone. GPT-5.5 Pro gives you the larger context window at 1M, compared with 128K for LFM2.5-8B-A1B.
GPT-5.5 Pro is ahead on BenchLM's provisional leaderboard, 100 to 50.
LFM2.5-8B-A1B has the edge for math in this comparison, averaging 59.9 versus 52.4. GPT-5.5 Pro stays close enough that the answer can still flip depending on your workload.
For engineers, researchers, and the plain curious — a weekly brief on new models, ranking shifts, and pricing changes.
Free. No spam. Unsubscribe anytime.