Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Composer 2.5
64
GPT-5.4 nano
62
Pick Composer 2.5 if you want the stronger benchmark profile. GPT-5.4 nano only becomes the better choice if you want the cheaper token bill or you need the larger 400K context window.
Agentic
+26.4 difference
Composer 2.5
GPT-5.4 nano
$0.5 / $2.5
$0.2 / $1.25
N/A
191 t/s
N/A
3.64s
200K
400K
Pick Composer 2.5 if you want the stronger benchmark profile. GPT-5.4 nano only becomes the better choice if you want the cheaper token bill or you need the larger 400K context window.
Composer 2.5 has the cleaner provisional overall profile here, landing at 64 versus 62. It is a real lead, but still close enough that category-level strengths matter more than the headline number.
Composer 2.5's sharpest advantage is in agentic, where it averages 69.3 against 42.9. The single biggest benchmark swing on the page is Terminal-Bench 2.0, 69.3% to 46.3%.
Composer 2.5 is also the more expensive model on tokens at $0.50 input / $2.50 output per 1M tokens, versus $0.20 input / $1.25 output per 1M tokens for GPT-5.4 nano. That is roughly 2.0x on output cost alone. GPT-5.4 nano gives you the larger context window at 400K, compared with 200K for Composer 2.5.
Composer 2.5 is ahead on BenchLM's provisional leaderboard, 64 to 62. The biggest single separator in this matchup is Terminal-Bench 2.0, where the scores are 69.3% and 46.3%.
Composer 2.5 has the edge for agentic tasks in this comparison, averaging 69.3 versus 42.9. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
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