Head-to-head comparison across 2benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
GPT-5.3 Codex
89
GPT-5.4
93
Verified leaderboard positions: GPT-5.3 Codex unranked · GPT-5.4 #4
Pick GPT-5.4 if you want the stronger benchmark profile. GPT-5.3 Codex only becomes the better choice if coding is the priority or you want the cheaper token bill.
Agentic
+5.5 difference
Coding
+5.4 difference
GPT-5.3 Codex
GPT-5.4
$2.5 / $10
$2.5 / $15
79 t/s
74 t/s
88.26s
151.79s
400K
1.05M
Pick GPT-5.4 if you want the stronger benchmark profile. GPT-5.3 Codex 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, 93 to 89. 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 agentic, where it averages 77 against 71.5. The single biggest benchmark swing on the page is OSWorld-Verified, 64.7% to 75%. GPT-5.3 Codex 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 $2.50 input / $10.00 output per 1M tokens for GPT-5.3 Codex. GPT-5.4 gives you the larger context window at 1.05M, compared with 400K for GPT-5.3 Codex.
GPT-5.4 is ahead on BenchLM's provisional leaderboard, 93 to 89. The biggest single separator in this matchup is OSWorld-Verified, where the scores are 64.7% and 75%.
GPT-5.3 Codex has the edge for coding in this comparison, averaging 63.1 versus 57.7. Inside this category, SWE-bench Pro 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 71.5. Inside this category, OSWorld-Verified is the benchmark that creates the most daylight between them.
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