Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Composer 2.5
82
GLM-5.1
83
Verified leaderboard positions: Composer 2.5 unranked · GLM-5.1 #23
Pick GLM-5.1 if you want the stronger benchmark profile. Composer 2.5 only becomes the better choice if agentic is the priority or you want the cheaper token bill.
Agentic
+4.0 difference
Composer 2.5
GLM-5.1
$0.5 / $2.5
$1.4 / $4.4
N/A
N/A
N/A
N/A
200K
203K
Pick GLM-5.1 if you want the stronger benchmark profile. Composer 2.5 only becomes the better choice if agentic is the priority or you want the cheaper token bill.
GLM-5.1 finishes one point ahead on BenchLM's provisional leaderboard, 83 to 82. 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-5.1 is also the more expensive model on tokens at $1.40 input / $4.40 output per 1M tokens, versus $0.50 input / $2.50 output per 1M tokens for Composer 2.5. GLM-5.1 gives you the larger context window at 203K, compared with 200K for Composer 2.5.
GLM-5.1 is ahead on BenchLM's provisional leaderboard, 83 to 82. The biggest single separator in this matchup is Terminal-Bench 2.0, where the scores are 69.3% and 63.5%.
Composer 2.5 has the edge for agentic tasks in this comparison, averaging 69.3 versus 65.3. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
Estimates at 50,000 req/day · 1000 tokens/req average.
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