Grok 4.3 vs Kimi K3
Grok 4.3 
Kimi K3 Verdict
- Kimi K3 leads on quality: 66.5 vs 60.7.
- Grok 4.3 (medium) is stronger in instruction following, knowledge.
- Kimi K3 is stronger in agents & tools, composite, long context, multimodal, coding, human preference, maths.
- Grok 4.3 (medium) is 3.8× cheaper ($1.56 vs $6.00 per 1M blended).
- Grok 4.3 (medium) streams 3.0× faster (112 vs 38 tokens per second).
| Metric | Grok 4.3 (medium) | Kimi K3 |
|---|---|---|
| BenchLeader Index | 60.7 | 66.5 |
| Agents & tools score | 60.1 | 67.4 |
| Composite score | 60.3 | 74.2 |
| Instruction following score | 80.0 | – |
| Knowledge score | 72.1 | 68.2 |
| Long context score | 64.0 | 71.1 |
| Multimodal score | 60.2 | 65.0 |
| Coding score | – | 65.0 |
| Human preference score | – | 71.2 |
| Maths score | – | 78.1 |
| Blended price $/M | $1.56 | $6.00 |
| Output speed | 112 tok/s | 38 tok/s |
| Time to first answer | 12.1 s | 56.3 s |
| Context window | 1M | 1.0M |
| SciCode | – | 58.7% |
| APEX-Agents | – | 39.3% |
| FrontierCode | – | 44.2% |
| ProofBench | – | 87.0% |
| Epoch Capabilities Index | – | 157.6 |
| LiveBench | – | 79.2% |
| LiveBench Reasoning | – | 90.7% |
| LiveBench Coding | – | 81.5% |
| LiveBench Agentic Coding | – | 62.2% |
| LiveBench Mathematics | – | 84.4% |
| LiveBench Data Analysis | – | 78.7% |
| LiveBench Language | – | 85.5% |
| AA Intelligence Index | 24.8 | 43.8 |
| IFBench | 83.3% | – |
| AA-LCR | 75.0% | 88.7% |
| MMMU-Pro | 75.8% | 80.5% |
| AA-Omniscience | 16.7 | 19.7 |
| Terminal-Bench Hard | 30.3% | – |
| GPQA Diamond (AA) | 89.0% | 93.5% |
| Humanity's Last Exam (AA) | 30.0% | 46.9% |
| SciCode (AA) | – | 59.5% |
| τ²-Bench Telecom (AA) | 91.2% | – |
| LegalBench | – | 86.0% |
| CorpFin | – | 71.6% |
| TaxEval | – | 75.7% |
| Terminal-Bench 2.1 (Vals) | – | 80.9% |
| SWE-bench (Vals) | – | 93.4% |
| GPQA Diamond (Vals) | – | 92.9% |
| Vals Index | – | 57.8 |
| EQ-Bench 4 | – | 1339 |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
Grok 4.3 vs Kimi K3: questions
- Is Grok 4.3 better than Kimi K3?
- Kimi K3 leads on quality: 66.5 vs 60.7. The BenchLeader Index combines every independent quality benchmark; Kimi K3 is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is Grok 4.3 better than Kimi K3 for agentic tasks?
- Kimi K3 scores higher in agentic tasks (67 vs 60 on the category index, where 50 is average).
- Which is cheaper, Grok 4.3 or Kimi K3?
- Grok 4.3 is cheaper: $1.56 against $6.00 per million tokens, blended at three input tokens per output token.
- Which is faster, Grok 4.3 or Kimi K3?
- Grok 4.3 streams faster: 112 against 38 output tokens per second.
- Which has the larger context window?
- Kimi K3 accepts more context: 1.0M against 1M tokens.