Head-to-head comparison across 0benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
GPT-5.3 Instant
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Grok 4 Fast (Reasoning)
15
Benchmark data for GPT-5.3 Instant and Grok 4 Fast (Reasoning) is coming soon on BenchLM.
GPT-5.3 Instant
Grok 4 Fast (Reasoning)
$1.75 / $14
N/A
N/A
N/A
N/A
N/A
400K
2M
Benchmark data for GPT-5.3 Instant and Grok 4 Fast (Reasoning) is coming soon on BenchLM.
BenchLM does not have sourced benchmark coverage for GPT-5.3 Instant yet. This comparison is currently limited to metadata such as context window, reasoning mode, and pricing where available.
Grok 4 Fast (Reasoning) has the larger context window at 2M, compared with 400K for GPT-5.3 Instant.
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-5.3 Instant: $1.75 input / $14.00 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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