Model comparison
GPT-5 vs Grok 4.3
GPT-5 is the stronger model overall, scoring 50.9 to 43.8 on the Noometry Index. Grok 4.3 costs 2.2× less per token, which makes it the better buy when GPT-5's lead doesn't matter for your workload.
Last verified . 35 shared benchmarks.
Summary
- They share 35 benchmarks with published results for both. GPT-5 scores higher in 10 categories and Grok 4.3 in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in long context, where GPT-5 leads 69.5 to 42.5.
- The biggest single-benchmark swing is SimpleQA Verified: 50.1% for GPT-5 and 33.2% for Grok 4.3.
- Grok 4.3 is cheaper at $1.25 / $2.50 per million input/output tokens, against $1.25 / $10 for GPT-5.
- Grok 4.3 accepts more context: 1M tokens versus 400K.
Side by side
| GPT-5 | Grok 4.3 | |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 50.9 | 43.8 |
| Released | 2025-08-07 | 2026-04-17 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | 1M |
| Max output | 128K | 30K |
| Input $ / M tokens | $1.25 | $1.25 |
| Output $ / M tokens | $10 | $2.50 |
| Results tracked | 69 | 40 |
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Category by category
Coding GPT-5 leads
GPT-5: 50.3 (#47), Grok 4.3: 41.6 (#121)
| Benchmark | GPT-5 | Grok 4.3 |
|---|---|---|
| LMArena WebDev | 1418 | 1357 |
| SciCode | 42.9% | 47.3% |
| WeirdML | 60.7% | 49.9% |
| LMArena Coding | 1436 | 1415 |
| ALE-Bench | 1,162 | 944.17 |
| SWE-bench Verified | 73.6% | — |
| SWE-bench Verified (bash only) | 65% | — |
| Aider Polyglot | 88% | — |
| GSO | 6.9% | — |
| AlgoTune | 1.67 | — |
Agentic & Tool Use GPT-5 leads
GPT-5: 33.1 (#56), Grok 4.3: 27.7 (#99)
| Benchmark | GPT-5 | Grok 4.3 |
|---|---|---|
| LMArena Search | 1133 | 1165 |
| Terminal-Bench | 49.6% | — |
| GDPval | 34.8% | — |
| Remote Labor Index | 1.7% | — |
| DeepResearch Bench | 49.6% | — |
| BALROG | 32.8% | — |
| GDP.pdf | — | 8% |
| METR Time Horizons | 69.6% | — |
| Vending-Bench 2 | — | 35.26 |
Reasoning GPT-5 leads
GPT-5: 38.3 (#64), Grok 4.3: 35.9 (#68)
| Benchmark | GPT-5 | Grok 4.3 |
|---|---|---|
| CritPt | 12.6% | 8% |
| Chess Puzzles | 37% | 25% |
| LMArena Hard Prompts | 1416 | 1396 |
| DTBench | 90.7% | 90.7% |
| LMCA | 40% | 38.3% |
| Epoch Capabilities Index | 150 | 149.16 |
| ForecastBench | 61.4 | 60.3 |
| ARC-AGI-2 | 9.9% | — |
| SimpleBench | 56.7% | — |
| Kagi LLM Benchmark | 72.7% | — |
| NYT Connections (extended) | — | 55.2% |
| ARC-AGI-1 | 65.7% | — |
| EnigmaEval | 10.5% | — |
| EBR-Bench | 12.7% | — |
| Mystery Game Puzzles | 23% | — |
Math GPT-5 leads
GPT-5: 55.0 (#44), Grok 4.3: 46.0 (#74)
| Benchmark | GPT-5 | Grok 4.3 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 55.4% | 42.8% |
| FrontierMath Tier 4 | 22% | 14.6% |
| OTIS Mock AIME 2024-2025 | 91.4% | 93.3% |
| ProofBench | 18% | 11% |
| LMArena Math | 1407 | 1388 |
| Omni-MATH | 64.7% | — |
| MATH Level 5 | 98.1% | — |
| FrontierMath (Feb 2025 set) | 32.4% | — |
| FrontierMath Tier 4 (v1) | 12.5% | — |
Knowledge GPT-5 leads
GPT-5: 56.6 (#43), Grok 4.3: 52.5 (#62)
| Benchmark | GPT-5 | Grok 4.3 |
|---|---|---|
| GPQA Diamond | 86.2% | 88.8% |
| SimpleQA Verified | 50.1% | 33.2% |
| LMArena Expert | 1419 | 1385 |
| Humanity's Last Exam | 25.3% | — |
| MMLU-Pro | 86.3% | — |
| Confabulations | 10.3% | — |
| Vectara Hallucination Rate | 14.7% | — |
| GPQA (HELM) | 79.2% | — |
Multimodal GPT-5 leads
GPT-5: 46.8 (#13), Grok 4.3: 31.6 (#104)
| Benchmark | GPT-5 | Grok 4.3 |
|---|---|---|
| LMArena Vision | 1232 | 1229 |
| GeoBench | 81% | — |
| VPCT | 66% | — |
| Blueprint-Bench 2 | — | 0% |
Multilingual Too close to call
GPT-5: 51.4 (#110), Grok 4.3: 50.5 (#120)
| Benchmark | GPT-5 | Grok 4.3 |
|---|---|---|
| LMArena Non-English | 1397 | 1385 |
| LMArena Chinese | 1422 | 1422 |
| LMArena French | 1410 | 1412 |
| LMArena German | 1416 | 1395 |
| LMArena Japanese | 1409 | 1379 |
| LMArena Korean | 1360 | 1356 |
| LMArena Russian | 1406 | 1399 |
| LMArena Spanish | 1399 | 1398 |
Instruction Following GPT-5 leads
GPT-5: 73.8 (#113), Grok 4.3: 72.1 (#140)
| Benchmark | GPT-5 | Grok 4.3 |
|---|---|---|
| LMArena Instruction Following | 1388 | 1366 |
| IFEval | 87.5% | — |
Long Context GPT-5 leads
GPT-5: 69.5 (#2), Grok 4.3: 42.5 (#123)
| Benchmark | GPT-5 | Grok 4.3 |
|---|---|---|
| LMArena Longer Query | 1399 | 1393 |
| Fiction.LiveBench | 97.2% | — |
Writing & Preference GPT-5 leads
GPT-5: 63.4 (#65), Grok 4.3: 58.5 (#118)
| Benchmark | GPT-5 | Grok 4.3 |
|---|---|---|
| LMArena Text | 1406 | 1397 |
| LMArena Creative Writing | 1365 | 1380 |
| LMArena Multi-Turn | 1426 | 1406 |
| Short-Story Creative Writing | 86% | — |
| EQ-Bench Creative Writing | 1627 | — |
| WildBench | 85.7% | — |
| EQ-Bench 4 | — | 1075 |
Frequently asked questions
Is GPT-5 better than Grok 4.3?
GPT-5 is the stronger model overall, scoring 50.9 to 43.8 on the Noometry Index. Grok 4.3 costs 2.2× less per token, which makes it the better buy when GPT-5's lead doesn't matter for your workload.
Which is cheaper, GPT-5 or Grok 4.3?
Grok 4.3 is cheaper. It lists at $1.25 per million input tokens and $2.50 per million output tokens; GPT-5 lists at $1.25 and $10.
Is GPT-5 or Grok 4.3 better for coding?
GPT-5 scores higher on coding benchmarks: 50.3 versus 41.6 in the Noometry coding category.
Which has the bigger context window?
Grok 4.3 does, with 1M tokens against 400K.
How many benchmarks do GPT-5 and Grok 4.3 share?
35 benchmarks have published results for both models. GPT-5 has 69 scored results on Noometry and Grok 4.3 has 40.