Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
GPT-5.5
91
LFM2.5-8B-A1B
50
Verified leaderboard positions: GPT-5.5 #5 · LFM2.5-8B-A1B unranked
Pick GPT-5.5 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
+8.2 difference
GPT-5.5
LFM2.5-8B-A1B
$5 / $30
$0 / $0
N/A
N/A
N/A
N/A
1M
128K
Pick GPT-5.5 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 is clearly ahead on the provisional aggregate, 91 to 50. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.5 is also the more expensive model on tokens at $5.00 input / $30.00 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 gives you the larger context window at 1M, compared with 128K for LFM2.5-8B-A1B.
GPT-5.5 is ahead on BenchLM's provisional leaderboard, 91 to 50.
LFM2.5-8B-A1B has the edge for math in this comparison, averaging 59.9 versus 51.7. GPT-5.5 stays close enough that the answer can still flip depending on your workload.
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