Model comparison
GPT-5.6 Terra vs Grok 4
GPT-5.6 Terra is the stronger model overall, scoring 59.2 to 48.1 on the Noometry Index.
Last verified . 28 shared benchmarks.
Summary
- They share 28 benchmarks with published results for both. GPT-5.6 Terra scores higher in 8 categories and Grok 4 in 2 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.6 Terra leads 81.6 to 48.4.
- The biggest single-benchmark swing is ARC-AGI-2: 83.9% for GPT-5.6 Terra and 16% for Grok 4.
Side by side
| GPT-5.6 Terra | Grok 4 | |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 59.2 | 48.1 |
| Released | 2026-07-09 | 2025-07-09 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | — |
| Max output | 128K | — |
| Input $ / M tokens | $2 | — |
| Output $ / M tokens | $12 | — |
| Results tracked | 52 | 48 |
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Category by category
Coding GPT-5.6 Terra leads
GPT-5.6 Terra: 57.7 (#19), Grok 4: 50.3 (#46)
| Benchmark | GPT-5.6 Terra | Grok 4 |
|---|---|---|
| WeirdML | 78.3% | 45.7% |
| LMArena Coding | 1484 | 1408 |
| DeepSWE | 69.6% | — |
| FrontierCode | 41.3% | — |
| Aider Polyglot | — | 79.6% |
| CursorBench | 41.3% | — |
| LMArena WebDev | 1522 | — |
| SciCode | 55% | — |
| ALE-Bench | 1,951 | — |
Agentic & Tool Use GPT-5.6 Terra leads
GPT-5.6 Terra: 40.1 (#25), Grok 4: 32.3 (#68)
| Benchmark | GPT-5.6 Terra | Grok 4 |
|---|---|---|
| BALROG | 53.2% | 43.6% |
| Terminal-Bench | — | 27.2% |
| APEX-Agents | 58.2% | — |
| Berkeley Function Calling Leaderboard | — | 63% |
| GDPval | — | 21.1% |
| Cybench | — | 43% |
| DeepResearch Bench | — | 47.3% |
| GDP.pdf | 24.7% | — |
| LMArena Search | — | 1142 |
| METR Time Horizons | — | 66.6% |
| Vending-Bench 2 | 7,343 | — |
Reasoning GPT-5.6 Terra leads
GPT-5.6 Terra: 60.7 (#21), Grok 4: 36.7 (#65)
| Benchmark | GPT-5.6 Terra | Grok 4 |
|---|---|---|
| ARC-AGI-2 | 83.9% | 16% |
| SimpleBench | 48.9% | 60.5% |
| Kagi LLM Benchmark | 51.3% | 73.6% |
| ARC-AGI-1 | 96.5% | 66.7% |
| Chess Puzzles | 54% | 28% |
| LMArena Hard Prompts | 1468 | 1409 |
| Epoch Capabilities Index | 159.62 | 146.44 |
| NYT Connections (extended) | 78.4% | — |
| CritPt | 30% | — |
| Mystery Game Puzzles | 35% | — |
| DTBench | 93.3% | — |
| LMCA | 55% | — |
| Surface Evolver Bench | 83.8% | — |
| ForecastBench | — | 60.9 |
Math GPT-5.6 Terra leads
GPT-5.6 Terra: 81.6 (#12), Grok 4: 48.4 (#64)
| Benchmark | GPT-5.6 Terra | Grok 4 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 99.7% | 84% |
| LMArena Math | 1466 | 1422 |
| FrontierMath (Tiers 1-3) | 86% | — |
| FrontierMath Tier 4 | 70.7% | — |
| ProofBench | 74% | — |
| Omni-MATH | — | 60.3% |
| FrontierMath (Feb 2025 set) | — | 19.7% |
| FrontierMath Tier 4 (v1) | — | 2.1% |
Knowledge GPT-5.6 Terra leads
GPT-5.6 Terra: 61.2 (#30), Grok 4: 53.8 (#55)
| Benchmark | GPT-5.6 Terra | Grok 4 |
|---|---|---|
| GPQA Diamond | 93.3% | 87% |
| LMArena Expert | 1492 | 1415 |
| SimpleQA Verified | 43.2% | — |
| MMLU-Pro | — | 85.1% |
| Confabulations | — | 12.4% |
| GPQA (HELM) | — | 72.7% |
Multimodal GPT-5.6 Terra leads
GPT-5.6 Terra: 47.3 (#11), Grok 4: 33.7 (#94)
| Benchmark | GPT-5.6 Terra | Grok 4 |
|---|---|---|
| LMArena Vision | 1271 | 1210 |
| GeoBench | — | 45% |
| Blueprint-Bench 2 | 30.8% | — |
| Furniture Assembly | 54.2% | — |
| LMArena Document | 1472 | — |
Multilingual GPT-5.6 Terra leads
GPT-5.6 Terra: 54.4 (#44), Grok 4: 51.8 (#103)
| Benchmark | GPT-5.6 Terra | Grok 4 |
|---|---|---|
| LMArena Non-English | 1439 | 1403 |
| LMArena Chinese | 1513 | 1427 |
| LMArena French | 1471 | 1418 |
| LMArena German | 1460 | 1429 |
| LMArena Japanese | 1457 | 1394 |
| LMArena Korean | 1425 | 1377 |
| LMArena Russian | 1450 | 1410 |
| LMArena Spanish | 1448 | 1420 |
Instruction Following Grok 4 leads
GPT-5.6 Terra: 76.4 (#40), Grok 4: 79.2 (#5)
| Benchmark | GPT-5.6 Terra | Grok 4 |
|---|---|---|
| LMArena Instruction Following | 1454 | 1387 |
| IFEval | — | 94.9% |
Long Context Grok 4 leads
GPT-5.6 Terra: 44.4 (#68), Grok 4: 63.1 (#4)
| Benchmark | GPT-5.6 Terra | Grok 4 |
|---|---|---|
| LMArena Longer Query | 1451 | 1409 |
| Fiction.LiveBench | — | 94.4% |
Writing & Preference GPT-5.6 Terra leads
GPT-5.6 Terra: 70.2 (#23), Grok 4: 58.5 (#116)
| Benchmark | GPT-5.6 Terra | Grok 4 |
|---|---|---|
| LMArena Text | 1447 | 1411 |
| LMArena Creative Writing | 1410 | 1397 |
| LMArena Multi-Turn | 1449 | 1416 |
| Short-Story Creative Writing | — | 76.9% |
| EQ-Bench Creative Writing | 1855 | — |
| WildBench | — | 79.7% |
| EQ-Bench 4 | 1234 | — |
Frequently asked questions
Is GPT-5.6 Terra better than Grok 4?
GPT-5.6 Terra is the stronger model overall, scoring 59.2 to 48.1 on the Noometry Index.
Is GPT-5.6 Terra or Grok 4 better for coding?
GPT-5.6 Terra scores higher on coding benchmarks: 57.7 versus 50.3 in the Noometry coding category.
How many benchmarks do GPT-5.6 Terra and Grok 4 share?
28 benchmarks have published results for both models. GPT-5.6 Terra has 52 scored results on Noometry and Grok 4 has 48.