Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Gemma 4 31B
66
GPT-5.5 Pro
100
Pick GPT-5.5 Pro if you want the stronger benchmark profile. Gemma 4 31B only becomes the better choice if knowledge is the priority or you want the cheaper token bill.
Knowledge
+4.1 difference
Gemma 4 31B
GPT-5.5 Pro
$0 / $0
$30 / $180
N/A
N/A
N/A
N/A
256K
1M
Pick GPT-5.5 Pro if you want the stronger benchmark profile. Gemma 4 31B only becomes the better choice if knowledge is the priority or you want the cheaper token bill.
GPT-5.5 Pro is clearly ahead on the provisional aggregate, 100 to 66. 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 Gemma 4 31B. That is roughly Infinityx on output cost alone. GPT-5.5 Pro gives you the larger context window at 1M, compared with 256K for Gemma 4 31B.
GPT-5.5 Pro is ahead on BenchLM's provisional leaderboard, 100 to 66. The biggest single separator in this matchup is HLE, where the scores are 26.5% and 57.2%.
Gemma 4 31B has the edge for knowledge tasks in this comparison, averaging 61.3 versus 57.2. Inside this category, HLE is the benchmark that creates the most daylight between them.
Estimates at 50,000 req/day · 1000 tokens/req average.
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