Model comparison
Claude Opus 4.8 vs Grok 4.3
Claude Opus 4.8 is the stronger model overall, scoring 60.7 to 43.8 on the Noometry Index. Grok 4.3 costs 6.4× less per token, which makes it the better buy when Claude Opus 4.8's lead doesn't matter for your workload.
Last verified . 40 shared benchmarks.
Summary
- They share 40 benchmarks with published results for both. Claude Opus 4.8 scores higher in 10 categories and Grok 4.3 in 0 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Opus 4.8 leads 78.4 to 46.0.
- The biggest single-benchmark swing is ProofBench: 69% for Claude Opus 4.8 and 11% for Grok 4.3.
- Grok 4.3 is cheaper at $1.25 / $2.50 per million input/output tokens, against $5 / $25 for Claude Opus 4.8.
Side by side
| Claude Opus 4.8 | Grok 4.3 | |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 60.7 | 43.8 |
| Released | 2026-05-28 | 2026-04-17 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 1M |
| Max output | 128K | 30K |
| Input $ / M tokens | $5 | $1.25 |
| Output $ / M tokens | $25 | $2.50 |
| Results tracked | 65 | 40 |
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Category by category
Coding Claude Opus 4.8 leads
Claude Opus 4.8: 59.9 (#12), Grok 4.3: 41.6 (#121)
| Benchmark | Claude Opus 4.8 | Grok 4.3 |
|---|---|---|
| LMArena WebDev | 1556 | 1357 |
| SciCode | 53.5% | 47.3% |
| WeirdML | 82.9% | 49.9% |
| LMArena Coding | 1490 | 1415 |
| ALE-Bench | 1,564 | 944.17 |
| DeepSWE | 59% | — |
| FrontierCode | 46.5% | — |
| GSO | 47.1% | — |
Agentic & Tool Use Claude Opus 4.8 leads
Claude Opus 4.8: 47.6 (#11), Grok 4.3: 27.7 (#99)
| Benchmark | Claude Opus 4.8 | Grok 4.3 |
|---|---|---|
| GDP.pdf | 24% | 8% |
| LMArena Search | 1204 | 1165 |
| Vending-Bench 2 | 5,787 | 35.26 |
| APEX-Agents | 48.9% | — |
| OSWorld 2.0 | 20.6% | — |
| Remote Labor Index | 8.3% | — |
| τ²-bench Banking | 39.7% | — |
| DeepResearch Bench | 50.2% | — |
| PostTrainBench | 33.8% | — |
| GBAEval | 70.9% | — |
Reasoning Claude Opus 4.8 leads
Claude Opus 4.8: 64.7 (#16), Grok 4.3: 35.9 (#68)
| Benchmark | Claude Opus 4.8 | Grok 4.3 |
|---|---|---|
| NYT Connections (extended) | 91.1% | 55.2% |
| CritPt | 20.9% | 8% |
| Chess Puzzles | 34% | 25% |
| LMArena Hard Prompts | 1482 | 1396 |
| DTBench | 94.9% | 90.7% |
| LMCA | 57.5% | 38.3% |
| Epoch Capabilities Index | 158.21 | 149.16 |
| ForecastBench | 59.9 | 60.3 |
| ARC-AGI-2 | 72.1% | — |
| SimpleBench | 64.8% | — |
| Kagi LLM Benchmark | 88.8% | — |
| ARC-AGI-1 | 92.5% | — |
| EnigmaEval | 23.5% | — |
| EBR-Bench | 28.6% | — |
| Mystery Game Puzzles | 36% | — |
| Surface Evolver Bench | 87.5% | — |
| Bench to the Future 3 | 0.14 | — |
Math Claude Opus 4.8 leads
Claude Opus 4.8: 78.4 (#13), Grok 4.3: 46.0 (#74)
| Benchmark | Claude Opus 4.8 | Grok 4.3 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 80% | 42.8% |
| FrontierMath Tier 4 | 56.1% | 14.6% |
| OTIS Mock AIME 2024-2025 | 98.3% | 93.3% |
| ProofBench | 69% | 11% |
| LMArena Math | 1487 | 1388 |
| MathArena Final-Answer Competitions | 91.8% | — |
| FrontierMath (Feb 2025 set) | 47.2% | — |
| FrontierMath Tier 4 (v1) | 31.3% | — |
Knowledge Claude Opus 4.8 leads
Claude Opus 4.8: 61.3 (#29), Grok 4.3: 52.5 (#62)
| Benchmark | Claude Opus 4.8 | Grok 4.3 |
|---|---|---|
| GPQA Diamond | 91% | 88.8% |
| SimpleQA Verified | 53% | 33.2% |
| LMArena Expert | 1502 | 1385 |
Multimodal Claude Opus 4.8 leads
Claude Opus 4.8: 42.9 (#26), Grok 4.3: 31.6 (#104)
| Benchmark | Claude Opus 4.8 | Grok 4.3 |
|---|---|---|
| LMArena Vision | 1294 | 1229 |
| Blueprint-Bench 2 | 14.5% | 0% |
| Furniture Assembly | 42.5% | — |
| LMArena Document | 1475 | — |
Multilingual Claude Opus 4.8 leads
Claude Opus 4.8: 55.2 (#33), Grok 4.3: 50.5 (#120)
| Benchmark | Claude Opus 4.8 | Grok 4.3 |
|---|---|---|
| LMArena Non-English | 1450 | 1385 |
| LMArena Chinese | 1507 | 1422 |
| LMArena French | 1481 | 1412 |
| LMArena German | 1472 | 1395 |
| LMArena Japanese | 1440 | 1379 |
| LMArena Korean | 1432 | 1356 |
| LMArena Russian | 1474 | 1399 |
| LMArena Spanish | 1466 | 1398 |
Instruction Following Claude Opus 4.8 leads
Claude Opus 4.8: 77.4 (#24), Grok 4.3: 72.1 (#140)
| Benchmark | Claude Opus 4.8 | Grok 4.3 |
|---|---|---|
| LMArena Instruction Following | 1476 | 1366 |
Long Context Claude Opus 4.8 leads
Claude Opus 4.8: 45.4 (#35), Grok 4.3: 42.5 (#123)
| Benchmark | Claude Opus 4.8 | Grok 4.3 |
|---|---|---|
| LMArena Longer Query | 1483 | 1393 |
Writing & Preference Claude Opus 4.8 leads
Claude Opus 4.8: 72.0 (#16), Grok 4.3: 58.5 (#118)
| Benchmark | Claude Opus 4.8 | Grok 4.3 |
|---|---|---|
| LMArena Text | 1461 | 1397 |
| LMArena Creative Writing | 1454 | 1380 |
| EQ-Bench 4 | 1281 | 1075 |
| LMArena Multi-Turn | 1476 | 1406 |
| EQ-Bench Creative Writing | 1840 | — |
Frequently asked questions
Is Claude Opus 4.8 better than Grok 4.3?
Claude Opus 4.8 is the stronger model overall, scoring 60.7 to 43.8 on the Noometry Index. Grok 4.3 costs 6.4× less per token, which makes it the better buy when Claude Opus 4.8's lead doesn't matter for your workload.
Which is cheaper, Claude Opus 4.8 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; Claude Opus 4.8 lists at $5 and $25.
Is Claude Opus 4.8 or Grok 4.3 better for coding?
Claude Opus 4.8 scores higher on coding benchmarks: 59.9 versus 41.6 in the Noometry coding category.
Which has the bigger context window?
Both accept 1M tokens.
How many benchmarks do Claude Opus 4.8 and Grok 4.3 share?
40 benchmarks have published results for both models. Claude Opus 4.8 has 65 scored results on Noometry and Grok 4.3 has 40.