Grok 4.3 vs Kimi K2.6
Grok 4.3 
Kimi K2.6 Verdict
- Grok 4.3 (medium) and Kimi K2.6 are level on quality (60.7 vs 60.7).
- Grok 4.3 (medium) is stronger in agents & tools, instruction following, knowledge.
- Kimi K2.6 is stronger in composite, long context, multimodal, coding, human preference, maths, reasoning.
- They cost about the same ($1.56 per 1M blended).
- Grok 4.3 (medium) streams 2.5× faster (112 vs 44 tokens per second).
| Metric | Grok 4.3 (medium) | Kimi K2.6 |
|---|---|---|
| BenchLeader Index | 60.7 | 60.7 |
| Agents & tools score | 60.1 | 45.1 |
| Composite score | 60.3 | 68.6 |
| Instruction following score | 80.0 | 73.7 |
| Knowledge score | 72.1 | 58.6 |
| Long context score | 64.0 | 67.1 |
| Multimodal score | 60.2 | 63.7 |
| Coding score | – | 60.4 |
| Human preference score | – | 60.8 |
| Maths score | – | 53.8 |
| Reasoning score | – | 66.0 |
| Blended price $/M | $1.56 | $1.71 |
| Output speed | 112 tok/s | 44 tok/s |
| Time to first answer | 12.1 s | 103.2 s |
| Context window | 1M | 262k |
| GPQA Diamond | – | 90.8% |
| FrontierMath Tiers 1–3 | – | 57.2% |
| FrontierMath Tier 4 | – | 25.6% |
| OTIS Mock AIME | – | 96.1% |
| SWE-bench Verified (Epoch) | – | 76.7% |
| SimpleQA Verified | – | 34.9% |
| OSWorld-Verified 2.0 | – | 4.6% |
| SciCode | – | 53.5% |
| WeirdML | – | 55.9% |
| APEX-Agents | – | 18.9% |
| ProofBench | – | 16.0% |
| Epoch Capabilities Index | – | 151.0 |
| LMArena Text | – | 1461 |
| LMArena Hard Prompts | – | 1485 |
| LMArena Coding | – | 1514 |
| LMArena WebDev | – | 1509 |
| LMArena Vision | – | 1281 |
| AA Intelligence Index | 24.8 | 31.3 |
| IFBench | 83.3% | 76.0% |
| AA-LCR | 75.0% | 81.0% |
| MMMU-Pro | 75.8% | 79.4% |
| AA-Omniscience | 16.7 | 5.3 |
| Terminal-Bench Hard | 30.3% | 43.9% |
| GPQA Diamond (AA) | 89.0% | 91.1% |
| Humanity's Last Exam (AA) | 30.0% | 37.5% |
| SciCode (AA) | – | 51.5% |
| τ²-Bench Telecom (AA) | 91.2% | 95.9% |
| LiveCodeBench | – | 86.8% |
| MMLU-Pro | – | 87.6% |
| LegalBench | – | 84.7% |
| CorpFin | – | 66.7% |
| TaxEval | – | 74.7% |
| Terminal-Bench 2.1 (Vals) | – | 53.6% |
| SWE-bench (Vals) | – | 76.2% |
| GPQA Diamond (Vals) | – | 89.1% |
| Vals Index | – | 43.5 |
| HiL-Bench | – | 18.7% |
| EQ-Bench 4 | – | 1202 |
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 K2.6: questions
- Is Grok 4.3 better than Kimi K2.6?
- Grok 4.3 (medium) and Kimi K2.6 are level on quality (60.7 vs 60.7). The BenchLeader Index combines every independent quality benchmark; Kimi K2.6 is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is Grok 4.3 better than Kimi K2.6 for agentic tasks?
- Grok 4.3 scores higher in agentic tasks (60 vs 45 on the category index, where 50 is average).
- Which is cheaper, Grok 4.3 or Kimi K2.6?
- Grok 4.3 is cheaper: $1.56 against $1.71 per million tokens, blended at three input tokens per output token.
- Which is faster, Grok 4.3 or Kimi K2.6?
- Grok 4.3 streams faster: 112 against 44 output tokens per second.
- Which has the larger context window?
- Grok 4.3 accepts more context: 1M against 262k tokens.