GPT-OSS 20B vs Grok 4.5
Head-to-head comparison across 0benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Verdict
Grok 4.5 leads for most workloads.
Based on BenchLM composite scores, July 2026.
GPT-OSS 20B
19
Grok 4.5
75
Benchmark data for GPT-OSS 20B and Grok 4.5 is coming soon on BenchLM.
Category Radar
Head-to-Head by Category
Operational Comparison
GPT-OSS 20B
Grok 4.5
$0 / $0
$2 / $6
313 t/s
N/A
0.65s
N/A
128K
500K
Quick Verdict
Benchmark data for GPT-OSS 20B and Grok 4.5 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.
Grok 4.5 is priced at $2.00 input / $6.00 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for GPT-OSS 20B. Grok 4.5 has the larger context window at 500K, compared with 128K for GPT-OSS 20B.
Benchmark Deep Dive
Frequently Asked Questions (3)
Can I compare GPT-OSS 20B and Grok 4.5 on BenchLM yet?
Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.
Why does this comparison show “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.
What data is available for GPT-OSS 20B and Grok 4.5 today?
GPT-OSS 20B: $0.00 input / $0.00 output per 1M tokens Grok 4.5: $2.00 input / $6.00 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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