Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Grok 4.3
79
Grok Code Fast 1
40
Pick Grok 4.3 if you want the stronger benchmark profile. Grok Code Fast 1 only becomes the better choice if coding is the priority or you want the cheaper token bill.
Coding
+23.5 difference
Grok 4.3
Grok Code Fast 1
$1.25 / $2.5
$0.2 / $1.5
209 t/s
172 t/s
12.36s
2.81s
1M
256K
Pick Grok 4.3 if you want the stronger benchmark profile. Grok Code Fast 1 only becomes the better choice if coding is the priority or you want the cheaper token bill.
Grok 4.3 is clearly ahead on the provisional aggregate, 79 to 40. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Grok 4.3 is also the more expensive model on tokens at $1.25 input / $2.50 output per 1M tokens, versus $0.20 input / $1.50 output per 1M tokens for Grok Code Fast 1. Grok 4.3 is the reasoning model in the pair, while Grok Code Fast 1 is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use. Grok 4.3 gives you the larger context window at 1M, compared with 256K for Grok Code Fast 1.
Grok 4.3 is ahead on BenchLM's provisional leaderboard, 79 to 40.
Grok Code Fast 1 has the edge for coding in this comparison, averaging 70.8 versus 47.3. Grok 4.3 stays close enough that the answer can still flip depending on your workload.
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