Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Gemini 3.1 Flash-Lite
48
Grok 4.3
79
Pick Grok 4.3 if you want the stronger benchmark profile. Gemini 3.1 Flash-Lite only becomes the better choice if you want the cheaper token bill or you would rather avoid the extra latency and token burn of a reasoning model.
Multimodal
+4.9 difference
Gemini 3.1 Flash-Lite
Grok 4.3
$0.25 / $1.5
$1.25 / $2.5
205 t/s
209 t/s
7.50s
12.36s
1M
1M
Pick Grok 4.3 if you want the stronger benchmark profile. Gemini 3.1 Flash-Lite only becomes the better choice if you want the cheaper token bill or you would rather avoid the extra latency and token burn of a reasoning model.
Grok 4.3 is clearly ahead on the provisional aggregate, 79 to 48. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Grok 4.3's sharpest advantage is in multimodal & grounded, where it averages 78.1 against 73.2.
Grok 4.3 is also the more expensive model on tokens at $1.25 input / $2.50 output per 1M tokens, versus $0.25 input / $1.50 output per 1M tokens for Gemini 3.1 Flash-Lite. Grok 4.3 is the reasoning model in the pair, while Gemini 3.1 Flash-Lite 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 is ahead on BenchLM's provisional leaderboard, 79 to 48.
Grok 4.3 has the edge for multimodal and grounded tasks in this comparison, averaging 78.1 versus 73.2. Gemini 3.1 Flash-Lite stays close enough that the answer can still flip depending on your workload.
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