Model comparison
Claude Sonnet 4.5 vs Grok 4.20 Multi-Agent
Grok 4.20 Multi-Agent is the stronger model overall, scoring 45.5 to 44.0 on the Noometry Index.
Last verified . 19 shared benchmarks.
Summary
- They share 19 benchmarks with published results for both. Claude Sonnet 4.5 scores higher in 5 categories and Grok 4.20 Multi-Agent in 4 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.20 Multi-Agent leads 42.4 to 26.9.
- The biggest single-benchmark swing is NYT Connections (extended): 37.3% for Claude Sonnet 4.5 and 89.6% for Grok 4.20 Multi-Agent.
- Grok 4.20 Multi-Agent is cheaper at $1.25 / $2.50 per million input/output tokens, against $3 / $15 for Claude Sonnet 4.5.
Side by side
| Claude Sonnet 4.5 | Grok 4.20 Multi-Agent | |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 44.0 | 45.5 |
| Released | 2025-09-29 | 2026-03-09 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 1M |
| Max output | 64K | 30K |
| Input $ / M tokens | $3 | $1.25 |
| Output $ / M tokens | $15 | $2.50 |
| Results tracked | 73 | 20 |
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Category by category
Coding Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 47.8 (#54), Grok 4.20 Multi-Agent: 42.4 (#91)
| Benchmark | Claude Sonnet 4.5 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Coding | 1489 | 1458 |
| SWE-bench Verified | 71.3% | — |
| SWE-bench Verified (bash only) | 71.4% | — |
| LMArena WebDev | 1393 | — |
| SWE-bench Multilingual | 67% | — |
| SciCode | 44.7% | — |
| GSO | 14.7% | — |
| WeirdML | 47.7% | — |
| ALE-Bench | 796.15 | — |
| AlgoTune | 1.52 | — |
Agentic & Tool Use Not comparable
Claude Sonnet 4.5: 38.1 (#30), Grok 4.20 Multi-Agent: —
| Benchmark | Claude Sonnet 4.5 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Search | 1159 | 1204 |
| Terminal-Bench | 46.5% | — |
| Berkeley Function Calling Leaderboard | 73.2% | — |
| GDPval | 42.5% | — |
| Remote Labor Index | 2.1% | — |
| τ²-bench Airline | 72% | — |
| τ²-bench Banking | 25.3% | — |
| τ²-bench Retail | 72.4% | — |
| τ²-bench Telecom | 84.9% | — |
| Cybench | 60% | — |
| DeepResearch Bench | 52.6% | — |
| OSWorld | 62.9% | — |
| METR Time Horizons | 67.4% | — |
| Vending-Bench 2 | 3,839 | — |
Reasoning Grok 4.20 Multi-Agent leads
Claude Sonnet 4.5: 26.9 (#113), Grok 4.20 Multi-Agent: 42.4 (#44)
| Benchmark | Claude Sonnet 4.5 | Grok 4.20 Multi-Agent |
|---|---|---|
| NYT Connections (extended) | 37.3% | 89.6% |
| LMArena Hard Prompts | 1462 | 1448 |
| ARC-AGI-2 | 13.6% | — |
| SimpleBench | 54.3% | — |
| Kagi LLM Benchmark | 57.9% | — |
| ARC-AGI-1 | 63.7% | — |
| CritPt | 1.1% | — |
| Chess Puzzles | 12% | — |
| EnigmaEval | 6% | — |
| EBR-Bench | 2.4% | — |
| Mystery Game Puzzles | 17% | — |
| DTBench | 83.2% | — |
| LMCA | 38.8% | — |
| Epoch Capabilities Index | 146.84 | — |
| ForecastBench | 61.9 | — |
Math Grok 4.20 Multi-Agent leads
Claude Sonnet 4.5: 31.9 (#190), Grok 4.20 Multi-Agent: 36.6 (#106)
| Benchmark | Claude Sonnet 4.5 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Math | 1448 | 1441 |
| FrontierMath (Tiers 1-3) | 23.9% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 77.8% | — |
| ProofBench | 19% | — |
| Omni-MATH | 55.3% | — |
| MATH Level 5 | 97.7% | — |
| FrontierMath (Feb 2025 set) | 15.2% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 48.4 (#70), Grok 4.20 Multi-Agent: 39.7 (#116)
| Benchmark | Claude Sonnet 4.5 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Expert | 1483 | 1445 |
| GPQA Diamond | 82.3% | — |
| Humanity's Last Exam | 13.7% | — |
| SimpleQA Verified | 30.7% | — |
| MMLU-Pro | 86.9% | — |
| Vectara Hallucination Rate | 12% | — |
| GPQA (HELM) | 68.6% | — |
Multimodal Grok 4.20 Multi-Agent leads
Claude Sonnet 4.5: 34.1 (#84), Grok 4.20 Multi-Agent: 39.8 (#44)
| Benchmark | Claude Sonnet 4.5 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Vision | — | 1259 |
| VPCT | 39.8% | — |
| LMArena Document | 1450 | — |
Multilingual Grok 4.20 Multi-Agent leads
Claude Sonnet 4.5: 53.6 (#65), Grok 4.20 Multi-Agent: 54.6 (#40)
| Benchmark | Claude Sonnet 4.5 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Non-English | 1425 | 1440 |
| LMArena Chinese | 1459 | 1475 |
| LMArena French | 1459 | 1467 |
| LMArena German | 1427 | 1456 |
| LMArena Japanese | 1390 | 1405 |
| LMArena Korean | 1403 | 1416 |
| LMArena Russian | 1436 | 1457 |
| LMArena Spanish | 1457 | 1447 |
Instruction Following Too close to call
Claude Sonnet 4.5: 75.2 (#74), Grok 4.20 Multi-Agent: 75.0 (#80)
| Benchmark | Claude Sonnet 4.5 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Instruction Following | 1459 | 1420 |
| IFEval | 85% | — |
Long Context Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 45.2 (#45), Grok 4.20 Multi-Agent: 43.7 (#84)
| Benchmark | Claude Sonnet 4.5 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Longer Query | 1476 | 1430 |
Writing & Preference Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 66.7 (#33), Grok 4.20 Multi-Agent: 64.1 (#57)
| Benchmark | Claude Sonnet 4.5 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Text | 1439 | 1450 |
| LMArena Creative Writing | 1442 | 1435 |
| LMArena Multi-Turn | 1465 | 1451 |
| EQ-Bench Creative Writing | 1678 | — |
| WildBench | 85.4% | — |
Frequently asked questions
Is Claude Sonnet 4.5 better than Grok 4.20 Multi-Agent?
Grok 4.20 Multi-Agent is the stronger model overall, scoring 45.5 to 44.0 on the Noometry Index.
Which is cheaper, Claude Sonnet 4.5 or Grok 4.20 Multi-Agent?
Grok 4.20 Multi-Agent is cheaper. It lists at $1.25 per million input tokens and $2.50 per million output tokens; Claude Sonnet 4.5 lists at $3 and $15.
Is Claude Sonnet 4.5 or Grok 4.20 Multi-Agent better for coding?
Claude Sonnet 4.5 scores higher on coding benchmarks: 47.8 versus 42.4 in the Noometry coding category.
Which has the bigger context window?
Both accept 1M tokens.
How many benchmarks do Claude Sonnet 4.5 and Grok 4.20 Multi-Agent share?
19 benchmarks have published results for both models. Claude Sonnet 4.5 has 73 scored results on Noometry and Grok 4.20 Multi-Agent has 20.