GPT-6 Astra vs Grok 4.3
GPT-6 Astra 
Grok 4.3 Verdict
- GPT-6 Astra (max) leads on quality: 70.9 vs 60.7.
- GPT-6 Astra (max) is stronger in agents & tools, coding, composite, knowledge, maths, reasoning.
- Grok 4.3 (medium) is stronger in instruction following, long context, multimodal.
- Grok 4.3 (medium) is 13× cheaper ($1.56 vs $20.00 per 1M blended).
- Grok 4.3 (medium) streams 4.2× faster (112 vs 27 tokens per second).
| Metric | GPT-6 Astra (max) | Grok 4.3 (medium) |
|---|---|---|
| BenchLeader Index | 70.9 | 60.7 |
| Agents & tools score | 68.2 | 60.1 |
| Coding score | 78.6 | – |
| Composite score | 72.9 | 60.3 |
| Knowledge score | 80.0 | 72.1 |
| Maths score | 77.2 | – |
| Reasoning score | 73.6 | – |
| Instruction following score | – | 80.0 |
| Long context score | – | 64.0 |
| Multimodal score | – | 60.2 |
| Blended price $/M | $20.00 | $1.56 |
| Output speed | 27 tok/s | 112 tok/s |
| Time to first answer | 337.3 s | 12.1 s |
| Context window | 1.1M | 1M |
| GPQA Diamond | 95.8% | – |
| FrontierMath Tiers 1–3 | 93.7% | – |
| FrontierMath Tier 4 | 97.6% | – |
| OTIS Mock AIME | 100.0% | – |
| SimpleQA Verified | 75.6% | – |
| Terminal-Bench | 58.2% | – |
| SciCode | 56.5% | – |
| FrontierCode | 53.3% | – |
| LMArena WebDev | 1796 | – |
| LMArena Agent | 12.5 | – |
| LiveBench | 82.2% | – |
| LiveBench Reasoning | 92.7% | – |
| LiveBench Coding | 80.4% | – |
| LiveBench Agentic Coding | 57.3% | – |
| LiveBench Mathematics | 96.8% | – |
| LiveBench Data Analysis | 83.0% | – |
| LiveBench Language | 89.4% | – |
| 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% |
| Terminal-Bench 2.1 (Vals) | 87.3% | – |
| Vals Index | 66.6 | – |
| ARC-AGI-1 | 97.5% | – |
| ARC-AGI-2 | 95.0% | – |
| ARC-AGI-3 | 98.6% | – |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
GPT-6 Astra vs Grok 4.3: questions
- Is GPT-6 Astra better than Grok 4.3?
- GPT-6 Astra (max) leads on quality: 70.9 vs 60.7. The BenchLeader Index combines every independent quality benchmark; GPT-6 Astra (max) is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is GPT-6 Astra better than Grok 4.3 for agentic tasks?
- GPT-6 Astra scores higher in agentic tasks (68 vs 60 on the category index, where 50 is average).
- Which is cheaper, GPT-6 Astra or Grok 4.3?
- Grok 4.3 is cheaper: $1.56 against $20.00 per million tokens, blended at three input tokens per output token.
- Which is faster, GPT-6 Astra or Grok 4.3?
- Grok 4.3 streams faster: 112 against 27 output tokens per second.
- Which has the larger context window?
- GPT-6 Astra accepts more context: 1.1M against 1M tokens.