Gemini 3 Flash Preview
VS
Grok 4.20
Gemini 3 Flash Preview vs Grok 4.20: which wins at real work?
22 task areas · same graded test runs · rank comparison only, so 0–100 and Elo collections never mix raw scores.
Gemini 3 Flash Preview wins 18 of 22 task areas we tested; Grok 4.20 takes 4. Gemini 3 Flash Preview costs 1.1× less per token ($3.5 vs $3.75 per 1M).
Gemini 3 Flash Preview costs 1.1× less per token ($3.5 vs $3.75 per 1M).
Task by task
| Task area | Gemini 3 Flash Preview | Grok 4.20 | Winner |
|---|---|---|---|
| RAG, Safety & Grounding |
#13
/ 113
Excellent
|
#96
/ 113
Strong
|
Gemini 3 Flash Preview |
| Content & Brand |
#39
/ 124
Strong
|
#118
/ 124
Needs editing
|
Gemini 3 Flash Preview |
| Training & Education |
#11
/ 110
Excellent
|
#88
/ 110
Strong
|
Gemini 3 Flash Preview |
| Coding |
#22
/ 115
Strong
|
#86
/ 115
Usable
|
Gemini 3 Flash Preview |
| Chef / Home Cooking |
#39
/ 126
Usable
|
#100
/ 126
Needs editing
|
Gemini 3 Flash Preview |
| Data & Analytics |
#47
/ 110
Excellent
|
#102
/ 110
Excellent
|
Gemini 3 Flash Preview |
| Sales |
#35
/ 110
Usable
|
#85
/ 110
Usable
|
Gemini 3 Flash Preview |
| Creative & Comedy | #51 / 110 | #96 / 110 | Gemini 3 Flash Preview |
| Legal & HR |
#47
/ 110
Excellent
|
#87
/ 110
Strong
|
Gemini 3 Flash Preview |
| Customer Support |
#34
/ 113
Strong
|
#68
/ 113
Usable
|
Gemini 3 Flash Preview |
| Landing Pages |
#35
/ 72
Strong
|
#66
/ 72
Usable
|
Gemini 3 Flash Preview |
| Translation & Localization |
#67
/ 110
Excellent
|
#98
/ 110
Strong
|
Gemini 3 Flash Preview |
| Summarization & Meeting Notes |
#61
/ 110
Excellent
|
#85
/ 110
Excellent
|
Gemini 3 Flash Preview |
| AI Strategy |
#38
/ 126
Strong
|
#59
/ 126
Strong
|
Gemini 3 Flash Preview |
| Knowledge & Docs |
#49
/ 110
Usable
|
#70
/ 110
Usable
|
Gemini 3 Flash Preview |
| Research & Competitive Analysis |
#71
/ 110
Usable
|
#52
/ 110
Usable
|
Grok 4.20 |
| Frontend & Landing Pages |
#1
/ 109
Usable
|
#15
/ 109
Needs editing
|
Gemini 3 Flash Preview |
| Structured Output |
#34
/ 113
Excellent
|
#48
/ 113
Excellent
|
Gemini 3 Flash Preview |
| Product & Project Management |
#69
/ 110
Strong
|
#56
/ 110
Strong
|
Grok 4.20 |
| Investor & Pitch |
#47
/ 66
Usable
|
#59
/ 66
Usable
|
Gemini 3 Flash Preview |
| Executive Assistant |
#92
/ 112
Usable
|
#83
/ 112
Usable
|
Grok 4.20 |
| Presentations & Decks |
#52
/ 110
Excellent
|
#46
/ 110
Excellent
|
Grok 4.20 |
Rank = position among every model config we tested in that task area (lower is better). Sorted by biggest gap first.
Frequently asked
Is Gemini 3 Flash Preview better than Grok 4.20?
Across 22 task areas we benchmarked, Gemini 3 Flash Preview ranks higher in 18 and Grok 4.20 in 4.
Which is cheaper, Gemini 3 Flash Preview or Grok 4.20?
Gemini 3 Flash Preview costs 1.1× less per token ($3.5 vs $3.75 per 1M).
What is Gemini 3 Flash Preview better at?
Gemini 3 Flash Preview out-ranks Grok 4.20 at RAG, Safety & Grounding, Content & Brand, Training & Education.
What is Grok 4.20 better at?
Grok 4.20 out-ranks Gemini 3 Flash Preview at Research & Competitive Analysis, Product & Project Management, Executive Assistant.
More comparisons
This page is Spring Prompt, running in public
We just did this for every model. Do it for your prompt.
The rankings above come from running real tasks through real models and scoring every output. Spring Prompt is that same engine — pointed at your prompt, your test cases, and your definition of good.
- Generate test cases from your prompt — no eval set required to start.
- Compare models side by side with quality, cost and latency in one matrix.
- Optimise the winner until the scores say it's ready to ship.
Prompt × model results
12 test cases · 3 evals