Head-to-head comparison across 3benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
GLM-5.1
74
GPT-5.4
88
Verified leaderboard positions: GLM-5.1 #30 · GPT-5.4 #19
Pick GPT-5.4 if you want the stronger benchmark profile. GLM-5.1 only becomes the better choice if coding is the priority or you want the cheaper token bill.
Agentic
+11.7 difference
Coding
+3.2 difference
Knowledge
+13.8 difference
GLM-5.1
GPT-5.4
$1.4 / $4.4
$2.5 / $15
N/A
74 t/s
N/A
151.79s
203K
1.05M
Pick GPT-5.4 if you want the stronger benchmark profile. GLM-5.1 only becomes the better choice if coding is the priority or you want the cheaper token bill.
GPT-5.4 is clearly ahead on the provisional aggregate, 88 to 74. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.4's sharpest advantage is in knowledge, where it averages 66.1 against 52.3. The single biggest benchmark swing on the page is BrowseComp, 68% to 82.7%. GLM-5.1 does hit back in coding, so the answer changes if that is the part of the workload you care about most.
GPT-5.4 is also the more expensive model on tokens at $2.50 input / $15.00 output per 1M tokens, versus $1.40 input / $4.40 output per 1M tokens for GLM-5.1. That is roughly 3.4x on output cost alone. GPT-5.4 gives you the larger context window at 1.05M, compared with 203K for GLM-5.1.
GPT-5.4 is ahead on BenchLM's provisional leaderboard, 88 to 74. The biggest single separator in this matchup is BrowseComp, where the scores are 68% and 82.7%.
GPT-5.4 has the edge for knowledge tasks in this comparison, averaging 66.1 versus 52.3. Inside this category, AA-Omniscience Hallucination Rate is the benchmark that creates the most daylight between them.
GLM-5.1 has the edge for coding in this comparison, averaging 60.9 versus 57.7. Inside this category, Vibe Code Bench is the benchmark that creates the most daylight between them.
GPT-5.4 has the edge for agentic tasks in this comparison, averaging 77 versus 65.3. Inside this category, GDPval-AA is the benchmark that creates the most daylight between them.
Estimates at 50,000 req/day · 1000 tokens/req average.
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