Grok 4.3 vs Grok 4.5
Grok 4.3 Verdict
- Grok 4.5 leads on quality: 63.5 vs 60.7.
- Grok 4.3 (medium) is stronger in agents & tools, instruction following.
- Grok 4.5 is stronger in composite, knowledge, long context, multimodal, coding, human preference, reasoning.
- Grok 4.3 (medium) is 1.9× cheaper ($1.56 vs $3.00 per 1M blended).
- Grok 4.3 (medium) streams 2.2× faster (112 vs 52 tokens per second).
| Metric | Grok 4.3 (medium) | Grok 4.5 |
|---|---|---|
| BenchLeader Index | 60.7 | 63.5 |
| Agents & tools score | 60.1 | 58.6 |
| Composite score | 60.3 | 66.2 |
| Instruction following score | 80.0 | – |
| Knowledge score | 72.1 | 76.2 |
| Long context score | 64.0 | 66.2 |
| Multimodal score | 60.2 | 64.9 |
| Coding score | – | 59.8 |
| Human preference score | – | 67.2 |
| Reasoning score | – | 69.2 |
| Blended price $/M | $1.56 | $3.00 |
| Output speed | 112 tok/s | 52 tok/s |
| Time to first answer | 12.1 s | 13.6 s |
| Context window | 1M | 500k |
| SimpleBench | – | 70.0% |
| WeirdML | – | 46.4% |
| APEX-Agents | – | 34.2% |
| FrontierCode | – | 42.4% |
| Epoch Capabilities Index | – | 153.9 |
| LMArena Text | – | 1471 |
| LMArena Hard Prompts | – | 1495 |
| LMArena Coding | – | 1523 |
| LMArena WebDev | – | 1556 |
| LMArena Vision | – | 1291 |
| LMArena Agent | – | 3.9 |
| LiveBench | – | 75.8% |
| LiveBench Reasoning | – | 87.2% |
| LiveBench Coding | – | 68.6% |
| LiveBench Agentic Coding | – | 56.5% |
| LiveBench Mathematics | – | 90.8% |
| LiveBench Data Analysis | – | 73.0% |
| LiveBench Language | – | 82.8% |
| AA Intelligence Index | 24.8 | 39.1 |
| IFBench | 83.3% | – |
| AA-LCR | 75.0% | 79.3% |
| MMMU-Pro | 75.8% | 80.4% |
| AA-Omniscience | 16.7 | 25.3 |
| Terminal-Bench Hard | 30.3% | – |
| GPQA Diamond (AA) | 89.0% | 93.1% |
| Humanity's Last Exam (AA) | 30.0% | 42.7% |
| SciCode (AA) | – | 55.0% |
| τ²-Bench Telecom (AA) | 91.2% | – |
| Kagi LLM Benchmark | – | 83.5% |
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 Grok 4.5: questions
- Is Grok 4.3 better than Grok 4.5?
- Grok 4.5 leads on quality: 63.5 vs 60.7. The BenchLeader Index combines every independent quality benchmark; Grok 4.5 is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is Grok 4.3 better than Grok 4.5 for agentic tasks?
- Grok 4.3 scores higher in agentic tasks (60 vs 59 on the category index, where 50 is average).
- Which is cheaper, Grok 4.3 or Grok 4.5?
- Grok 4.3 is cheaper: $1.56 against $3.00 per million tokens, blended at three input tokens per output token.
- Which is faster, Grok 4.3 or Grok 4.5?
- Grok 4.3 streams faster: 112 against 52 output tokens per second.
- Which has the larger context window?
- Grok 4.3 accepts more context: 1M against 500k tokens.