Head-to-head comparison across 0benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
GPT-5.4 mini
71
GPT-OSS 20B
18
Benchmark data for GPT-5.4 mini and GPT-OSS 20B is coming soon on BenchLM.
GPT-5.4 mini
GPT-OSS 20B
$0.75 / $4.5
$0 / $0
201 t/s
313 t/s
3.85s
0.65s
400K
128K
Benchmark data for GPT-5.4 mini and GPT-OSS 20B is coming soon on BenchLM.
BenchLM has partial data for these models, but not enough overlapping benchmark coverage to produce a fair score-level comparison yet.
GPT-5.4 mini is priced at $0.75 input / $4.50 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for GPT-OSS 20B. GPT-5.4 mini has the larger context window at 400K, compared with 128K for GPT-OSS 20B.
Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.
BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.
GPT-5.4 mini: $0.75 input / $4.50 output per 1M tokens GPT-OSS 20B: $0.00 input / $0.00 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.
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