GPT-5.4 vs Grok 4.3
GPT-5.4 
Grok 4.3 Verdict
- GPT-5.4 leads on quality: 63.5 vs 60.7.
- GPT-5.4 is stronger in agents & tools, coding, composite, human preference, long context, multimodal, reasoning.
- Grok 4.3 (medium) is stronger in instruction following, knowledge.
- Grok 4.3 (medium) is 3.6× cheaper ($1.56 vs $5.63 per 1M blended).
| Metric | GPT-5.4 | Grok 4.3 (medium) |
|---|---|---|
| BenchLeader Index | 63.5 | 60.7 |
| Agents & tools score | 66.2 | 60.1 |
| Coding score | 51.6 | – |
| Composite score | 78.3 | 60.3 |
| Human preference score | 64.7 | – |
| Instruction following score | 71.9 | 80.0 |
| Knowledge score | 66.9 | 72.1 |
| Long context score | 67.6 | 64.0 |
| Multimodal score | 64.0 | 60.2 |
| Reasoning score | 62.6 | – |
| Blended price $/M | $5.63 | $1.56 |
| Output speed | 129 tok/s | 112 tok/s |
| Time to first answer | 124.6 s | 12.1 s |
| Context window | 1.1M | 1M |
| Terminal-Bench | 81.8% | – |
| APEX-Agents | 34.9% | – |
| Epoch Capabilities Index | 156.9 | – |
| LMArena Text | 1466 | – |
| LMArena Hard Prompts | 1488 | – |
| LMArena Coding | 1514 | – |
| LMArena WebDev | 1386 | – |
| LMArena Vision | 1293 | – |
| AA Intelligence Index | 39.0 | 24.8 |
| IFBench | 74.0% | 83.3% |
| AA-LCR | 82.0% | 75.0% |
| MMMU-Pro | 78.4% | 75.8% |
| AA-Omniscience | 5.8 | 16.7 |
| Terminal-Bench Hard | 57.6% | 30.3% |
| GPQA Diamond (AA) | 92.0% | 89.0% |
| Humanity's Last Exam (AA) | 43.7% | 30.0% |
| τ²-Bench Telecom (AA) | 87.1% | 91.2% |
| HiL-Bench | 9.7% | – |
| EQ-Bench 4 | 1272 | – |
| Kagi LLM Benchmark | 63.8% | – |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
GPT-5.4 vs Grok 4.3: questions
- Is GPT-5.4 better than Grok 4.3?
- GPT-5.4 leads on quality: 63.5 vs 60.7. The BenchLeader Index combines every independent quality benchmark; GPT-5.4 is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is GPT-5.4 better than Grok 4.3 for agentic tasks?
- GPT-5.4 scores higher in agentic tasks (66 vs 60 on the category index, where 50 is average).
- Which is cheaper, GPT-5.4 or Grok 4.3?
- Grok 4.3 is cheaper: $1.56 against $5.63 per million tokens, blended at three input tokens per output token.
- Which is faster, GPT-5.4 or Grok 4.3?
- GPT-5.4 streams faster: 129 against 112 output tokens per second.
- Which has the larger context window?
- GPT-5.4 accepts more context: 1.1M against 1M tokens.