GPT-5.3 Instant 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-5.3 Instant
--
Grok 4.5
75
Benchmark data for GPT-5.3 Instant and Grok 4.5 is coming soon on BenchLM.
Operational Comparison
GPT-5.3 Instant
Grok 4.5
$1.75 / $14
$2 / $6
N/A
N/A
N/A
N/A
400K
500K
Quick Verdict
Benchmark data for GPT-5.3 Instant and Grok 4.5 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.
GPT-5.3 Instant is priced at $1.75 input / $14.00 output per 1M tokens, versus $2.00 input / $6.00 output per 1M tokens for Grok 4.5. Grok 4.5 has the larger context window at 500K, compared with 400K for GPT-5.3 Instant.
Benchmark Deep Dive
Frequently Asked Questions (3)
Can I compare GPT-5.3 Instant 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-5.3 Instant and Grok 4.5 today?
GPT-5.3 Instant: $1.75 input / $14.00 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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