GPT-5.4 Pro vs Grok 4.3
GPT-5.4 Pro 
Grok 4.3 Verdict
- GPT-5.4 Pro leads on quality: 64.3 vs 60.7.
- GPT-5.4 Pro is stronger in knowledge, multimodal, reasoning.
- Grok 4.3 (medium) is stronger in instruction following, agents & tools, composite, long context.
- Grok 4.3 (medium) is 43× cheaper ($1.56 vs $67.50 per 1M blended).
- Grok 4.3 (medium) streams 112.1× faster (112 vs 1 tokens per second).
| Metric | GPT-5.4 Pro | Grok 4.3 (medium) |
|---|---|---|
| BenchLeader Index | 64.3 | 60.7 |
| Instruction following score | 67.3 | 80.0 |
| Knowledge score | 73.6 | 72.1 |
| Multimodal score | 69.8 | 60.2 |
| Reasoning score | 75.3 | – |
| Agents & tools score | – | 60.1 |
| Composite score | – | 60.3 |
| Long context score | – | 64.0 |
| Blended price $/M | $67.50 | $1.56 |
| Output speed | 1 tok/s | 112 tok/s |
| Time to first answer | 6.5 s | 12.1 s |
| Context window | 1.1M | 1M |
| Humanity's Last Exam | 44.3% | – |
| SimpleBench | 74.1% | – |
| Epoch Capabilities Index | 158.9 | – |
| AA Intelligence Index | – | 24.8 |
| IFBench | – | 83.3% |
| AA-LCR | – | 75.0% |
| MMMU-Pro | – | 75.8% |
| AA-Omniscience | – | 16.7 |
| Terminal-Bench Hard | – | 30.3% |
| GPQA Diamond (AA) | – | 89.0% |
| Humanity's Last Exam (AA) | – | 30.0% |
| τ²-Bench Telecom (AA) | – | 91.2% |
| MultiChallenge | 69.2% | – |
| VISTA | 53.9% | – |
| MultiNRC | 62.3% | – |
| TutorBench | 56.6% | – |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
GPT-5.4 Pro vs Grok 4.3: questions
- Is GPT-5.4 Pro better than Grok 4.3?
- GPT-5.4 Pro leads on quality: 64.3 vs 60.7. The BenchLeader Index combines every independent quality benchmark; GPT-5.4 Pro is ahead overall as of 2026-09-10, but check the category scores for your use.
- Which is cheaper, GPT-5.4 Pro or Grok 4.3?
- Grok 4.3 is cheaper: $1.56 against $67.50 per million tokens, blended at three input tokens per output token.
- Which is faster, GPT-5.4 Pro or Grok 4.3?
- Grok 4.3 streams faster: 112 against 1 output tokens per second.
- Which has the larger context window?
- GPT-5.4 Pro accepts more context: 1.1M against 1M tokens.