Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.
GPT-5.4 is clearly ahead on the aggregate, 90 to 56. 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 coding, where it averages 84.5 against 27.6. The single biggest benchmark swing on the page is SWE-bench Verified, 84 to 24.
GPT-5.4 is also the more expensive model on tokens at $2.50 input / $15.00 output per 1M tokens, versus $0.08 input / $0.30 output per 1M tokens for Seed 1.6 Flash. That is roughly 50.0x on output cost alone. GPT-5.4 gives you the larger context window at 1.05M, compared with 256K for Seed 1.6 Flash.
Pick GPT-5.4 if you want the stronger benchmark profile. Seed 1.6 Flash only becomes the better choice if you want the cheaper token bill.
GPT-5.4
87.8
Seed 1.6 Flash
54.5
GPT-5.4
84.5
Seed 1.6 Flash
27.6
GPT-5.4
95.5
Seed 1.6 Flash
73.1
GPT-5.4
95.8
Seed 1.6 Flash
66.8
GPT-5.4
82.6
Seed 1.6 Flash
47.3
GPT-5.4
96
Seed 1.6 Flash
81
GPT-5.4
94.7
Seed 1.6 Flash
72.8
GPT-5.4
98.2
Seed 1.6 Flash
67.1
GPT-5.4 is ahead overall, 90 to 56. The biggest single separator in this matchup is SWE-bench Verified, where the scores are 84 and 24.
GPT-5.4 has the edge for knowledge tasks in this comparison, averaging 82.6 versus 47.3. Inside this category, HLE is the benchmark that creates the most daylight between them.
GPT-5.4 has the edge for coding in this comparison, averaging 84.5 versus 27.6. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
GPT-5.4 has the edge for math in this comparison, averaging 98.2 versus 67.1. Inside this category, HMMT Feb 2023 is the benchmark that creates the most daylight between them.
GPT-5.4 has the edge for reasoning in this comparison, averaging 95.8 versus 66.8. Inside this category, SimpleQA is the benchmark that creates the most daylight between them.
GPT-5.4 has the edge for agentic tasks in this comparison, averaging 87.8 versus 54.5. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
GPT-5.4 has the edge for multimodal and grounded tasks in this comparison, averaging 95.5 versus 73.1. Inside this category, OfficeQA Pro is the benchmark that creates the most daylight between them.
GPT-5.4 has the edge for instruction following in this comparison, averaging 96 versus 81. Inside this category, IFEval is the benchmark that creates the most daylight between them.
GPT-5.4 has the edge for multilingual tasks in this comparison, averaging 94.7 versus 72.8. Inside this category, MMLU-ProX is the benchmark that creates the most daylight between them.
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