Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
GPT-5.3 Codex
89
GPT-5.4 Pro
92
Pick GPT-5.4 Pro if you want the stronger benchmark profile. GPT-5.3 Codex only becomes the better choice if you want the cheaper token bill.
Agentic
+17.8 difference
GPT-5.3 Codex
GPT-5.4 Pro
$1.75 / $14
$30 / $180
79 t/s
74 t/s
88.26s
151.79s
400K
1.05M
Pick GPT-5.4 Pro if you want the stronger benchmark profile. GPT-5.3 Codex only becomes the better choice if you want the cheaper token bill.
GPT-5.4 Pro has the cleaner provisional overall profile here, landing at 92 versus 89. It is a real lead, but still close enough that category-level strengths matter more than the headline number.
GPT-5.4 Pro's sharpest advantage is in agentic, where it averages 89.3 against 71.5.
GPT-5.4 Pro is also the more expensive model on tokens at $30.00 input / $180.00 output per 1M tokens, versus $1.75 input / $14.00 output per 1M tokens for GPT-5.3 Codex. That is roughly 12.9x on output cost alone. GPT-5.4 Pro gives you the larger context window at 1.05M, compared with 400K for GPT-5.3 Codex.
GPT-5.4 Pro is ahead on BenchLM's provisional leaderboard, 92 to 89.
GPT-5.4 Pro has the edge for agentic tasks in this comparison, averaging 89.3 versus 71.5. GPT-5.3 Codex stays close enough that the answer can still flip depending on your workload.
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