Gemini 3.5 Flash vs Grok 4.5
Head-to-head comparison across 2benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Verdict
Gemini 3.5 Flash leads for most workloads.
Based on BenchLM composite scores, July 2026.
Gemini 3.5 Flash
81
Grok 4.5
75
Verified leaderboard positions: Gemini 3.5 Flash #11 · Grok 4.5 unranked
Pick Gemini 3.5 Flash if you want the stronger benchmark profile. Grok 4.5 only becomes the better choice if coding is the priority or you want the cheaper token bill.
Category Radar
Head-to-Head by Category
Category Breakdown
| Benchmark | Gemini 3.5 Flash | Δ | Grok 4.5 |
|---|---|---|---|
| Coding | 54.6 | → 10.1 | 64.7 |
| Agentic | 77.2 | → 6.1 | 83.3 |
| Reasoning | 74.7 | — | — |
| Knowledge | 47.2 | — | — |
| Multimodal | 83.8 | — | — |
| Inst. Following | 76.3 | — | — |
Operational Comparison
Gemini 3.5 Flash
Grok 4.5
$1.5 / $9
$2 / $6
284.2 t/s
N/A
18.55s
N/A
1M
500K
Quick Verdict
Pick Gemini 3.5 Flash if you want the stronger benchmark profile. Grok 4.5 only becomes the better choice if coding is the priority or you want the cheaper token bill.
Gemini 3.5 Flash is clearly ahead on the provisional aggregate, 81 to 75. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Gemini 3.5 Flash is also the more expensive model on tokens at $1.50 input / $9.00 output per 1M tokens, versus $2.00 input / $6.00 output per 1M tokens for Grok 4.5. Gemini 3.5 Flash gives you the larger context window at 1M, compared with 500K for Grok 4.5.
Benchmark Deep Dive
Frequently Asked Questions (3)
Which is better, Gemini 3.5 Flash or Grok 4.5?
Gemini 3.5 Flash is ahead on BenchLM's provisional leaderboard, 81 to 75. The biggest single separator in this matchup is SWE-bench Pro, where the scores are 55.1% and 64.7%.
Which is better for coding, Gemini 3.5 Flash or Grok 4.5?
Grok 4.5 has the edge for coding in this comparison, averaging 64.7 versus 54.6. Inside this category, CursorBench v3.2 is the benchmark that creates the most daylight between them.
Which is better for agentic tasks, Gemini 3.5 Flash or Grok 4.5?
Grok 4.5 has the edge for agentic tasks in this comparison, averaging 83.3 versus 77.2. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
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