Head-to-head comparison across 3benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
GLM-5.1
83
GPT-5.4
89
Verified leaderboard positions: GLM-5.1 #21 · GPT-5.4 #12
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, 89 to 83. 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, 89 to 83. 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, GPQA-D 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, BrowseComp is the benchmark that creates the most daylight between them.
Estimates at 50,000 req/day · 1000 tokens/req average.
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