Gemini 3 Flash vs Grok 4.3
Gemini 3 Flash 
Grok 4.3 Verdict
- Gemini 3 Flash (thinking) and Grok 4.3 (medium) are level on quality (61.6 vs 60.7).
- Gemini 3 Flash (thinking) is stronger in agents & tools, composite, long context, multimodal.
- Grok 4.3 (medium) is stronger in instruction following, knowledge.
- Gemini 3 Flash (thinking) is 1.4× cheaper ($1.13 vs $1.56 per 1M blended).
- Gemini 3 Flash (thinking) streams 1.6× faster (180 vs 112 tokens per second).
| Metric | Gemini 3 Flash (thinking) | Grok 4.3 (medium) |
|---|---|---|
| BenchLeader Index | 61.6 | 60.7 |
| Agents & tools score | 67.4 | 60.1 |
| Composite score | 62.3 | 60.3 |
| Instruction following score | 75.4 | 80.0 |
| Knowledge score | 69.0 | 72.1 |
| Long context score | 65.5 | 64.0 |
| Multimodal score | 64.4 | 60.2 |
| Blended price $/M | $1.13 | $1.56 |
| Output speed | 180 tok/s | 112 tok/s |
| Time to first answer | 6.1 s | 12.1 s |
| Context window | 1M | 1M |
| AA Intelligence Index | 26.3 | 24.8 |
| IFBench | 78.0% | 83.3% |
| AA-LCR | 78.0% | 75.0% |
| MMMU-Pro | 79.9% | 75.8% |
| AA-Omniscience | 10.1 | 16.7 |
| Terminal-Bench Hard | 38.6% | 30.3% |
| GPQA Diamond (AA) | 89.8% | 89.0% |
| Humanity's Last Exam (AA) | 36.6% | 30.0% |
| τ²-Bench Telecom (AA) | 80.4% | 91.2% |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
Gemini 3 Flash vs Grok 4.3: questions
- Is Gemini 3 Flash better than Grok 4.3?
- Gemini 3 Flash (thinking) and Grok 4.3 (medium) are level on quality (61.6 vs 60.7). The BenchLeader Index combines every independent quality benchmark; Gemini 3 Flash (thinking) is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is Gemini 3 Flash better than Grok 4.3 for agentic tasks?
- Gemini 3 Flash scores higher in agentic tasks (67 vs 60 on the category index, where 50 is average).
- Which is cheaper, Gemini 3 Flash or Grok 4.3?
- Gemini 3 Flash is cheaper: $1.13 against $1.56 per million tokens, blended at three input tokens per output token.
- Which is faster, Gemini 3 Flash or Grok 4.3?
- Gemini 3 Flash streams faster: 180 against 112 output tokens per second.
- Which has the larger context window?
- Both accept 1M tokens of context.