Head-to-head comparison across 3benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Claude Opus 4.8
93
GLM-5.2
94
Verified leaderboard positions: Claude Opus 4.8 #5 · GLM-5.2 #9
Pick GLM-5.2 if you want the stronger benchmark profile. Claude Opus 4.8 only becomes the better choice if coding is the priority.
Agentic
+0.9 difference
Coding
+14.3 difference
Knowledge
+2.9 difference
Claude Opus 4.8
GLM-5.2
$5 / $25
$1.4 / $4.4
N/A
N/A
N/A
N/A
1M
1M
Pick GLM-5.2 if you want the stronger benchmark profile. Claude Opus 4.8 only becomes the better choice if coding is the priority.
GLM-5.2 finishes one point ahead on BenchLM's provisional leaderboard, 94 to 93. That is enough to call, but not enough to treat as a blowout. This matchup comes down to a few meaningful edges rather than one model dominating the board.
GLM-5.2's sharpest advantage is in agentic, where it averages 81 against 80.1. The single biggest benchmark swing on the page is SWE-bench Pro, 69.2% to 62.1%. Claude Opus 4.8 does hit back in coding, so the answer changes if that is the part of the workload you care about most.
Claude Opus 4.8 is also the more expensive model on tokens at $5.00 input / $25.00 output per 1M tokens, versus $1.40 input / $4.40 output per 1M tokens for GLM-5.2. That is roughly 5.7x on output cost alone.
GLM-5.2 is ahead on BenchLM's provisional leaderboard, 94 to 93. The biggest single separator in this matchup is SWE-bench Pro, where the scores are 69.2% and 62.1%.
Claude Opus 4.8 has the edge for knowledge tasks in this comparison, averaging 70.1 versus 67.2. Inside this category, HLE w/o tools is the benchmark that creates the most daylight between them.
Claude Opus 4.8 has the edge for coding in this comparison, averaging 76.4 versus 62.1. Inside this category, SWE-bench Pro is the benchmark that creates the most daylight between them.
GLM-5.2 has the edge for agentic tasks in this comparison, averaging 81 versus 80.1. Inside this category, Toolathlon is the benchmark that creates the most daylight between them.
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