Model comparison
Claude Haiku 5.5 vs Grok 4.20 (Non-Reasoning)
Claude Haiku 5.5 and Grok 4.20 (Non-Reasoning) score almost the same on the Noometry Index (49.5 vs 48.6), so choose on price, context window or the category you care about most.
Last verified . 7 shared benchmarks.
Summary
- They share 7 benchmarks with published results for both. Claude Haiku 5.5 scores higher in 3 categories and Grok 4.20 (Non-Reasoning) in 2 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Haiku 5.5 leads 73.6 to 48.2.
- The biggest single-benchmark swing is FrontierMath (Tiers 1-3): 75.1% for Claude Haiku 5.5 and 44.9% for Grok 4.20 (Non-Reasoning).
- Claude Haiku 5.5 is cheaper at $0.10 / $0.50 per million input/output tokens, against $1.25 / $2.50 for Grok 4.20 (Non-Reasoning).
Side by side
| Claude Haiku 5.5 | Grok 4.20 (Non-Reasoning) | |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 49.5 | 48.6 |
| Released | 2026-10-07 | 2026-02-17 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 1M |
| Max output | 128K | 30K |
| Input $ / M tokens | $0.10 | $1.25 |
| Output $ / M tokens | $0.50 | $2.50 |
| Results tracked | 9 | 46 |
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Category by category
Coding Claude Haiku 5.5 leads
Claude Haiku 5.5: 49.2 (#50), Grok 4.20 (Non-Reasoning): 42.1 (#112)
| Benchmark | Claude Haiku 5.5 | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena WebDev | 1587 | 1375 |
| WeirdML | — | 52.3% |
| LMArena Coding | — | 1459 |
| ALE-Bench | — | 1,150 |
Agentic & Tool Use Not comparable
Claude Haiku 5.5: —, Grok 4.20 (Non-Reasoning): 34.4 (#46)
| Benchmark | Claude Haiku 5.5 | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| Terminal-Bench | — | 57.3% |
| τ²-bench Banking | — | 18% |
| LMArena Search | — | 1189 |
| Vending-Bench 2 | — | 4,663 |
Reasoning Grok 4.20 (Non-Reasoning) leads
Claude Haiku 5.5: 35.2 (#69), Grok 4.20 (Non-Reasoning): 52.3 (#32)
| Benchmark | Claude Haiku 5.5 | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| NYT Connections (extended) | 65.7% | 85.4% |
| ARC-AGI-2 | — | 65.1% |
| Kagi LLM Benchmark | — | 75% |
| ARC-AGI-1 | — | 89.5% |
| Chess Puzzles | — | 24% |
| Thematic Generalization | — | 63.8% |
| LMArena Hard Prompts | — | 1451 |
| Mystery Game Puzzles | 30% | — |
| DTBench | — | 90.1% |
| LMCA | — | 38.7% |
| Epoch Capabilities Index | — | 151.98 |
| ForecastBench | — | 61.4 |
Math Claude Haiku 5.5 leads
Claude Haiku 5.5: 73.6 (#18), Grok 4.20 (Non-Reasoning): 48.2 (#65)
| Benchmark | Claude Haiku 5.5 | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| FrontierMath (Tiers 1-3) | 75.1% | 44.9% |
| FrontierMath Tier 4 | 46.3% | 17.1% |
| OTIS Mock AIME 2024-2025 | 98.9% | 92.2% |
| ProofBench | — | 14% |
| LMArena Math | — | 1455 |
Knowledge Grok 4.20 (Non-Reasoning) leads
Claude Haiku 5.5: 50.8 (#70), Grok 4.20 (Non-Reasoning): 52.8 (#60)
| Benchmark | Claude Haiku 5.5 | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| GPQA Diamond | 89.6% | 89.3% |
| SimpleQA Verified | 23.8% | 30.2% |
| LMArena Expert | — | 1439 |
Multimodal Claude Haiku 5.5 leads
Claude Haiku 5.5: 43.7 (#21), Grok 4.20 (Non-Reasoning): 33.3 (#98)
| Benchmark | Claude Haiku 5.5 | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Vision | — | 1263 |
| Blueprint-Bench 2 | — | 0% |
| Furniture Assembly | 47.5% | — |
| LMArena Document | — | 1416 |
Multilingual Not comparable
Claude Haiku 5.5: —, Grok 4.20 (Non-Reasoning): 54.5 (#40)
| Benchmark | Claude Haiku 5.5 | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Non-English | — | 1441 |
| LMArena Chinese | — | 1481 |
| LMArena French | — | 1476 |
| LMArena German | — | 1465 |
| LMArena Japanese | — | 1449 |
| LMArena Korean | — | 1417 |
| LMArena Russian | — | 1458 |
| LMArena Spanish | — | 1443 |
Instruction Following Not comparable
Claude Haiku 5.5: —, Grok 4.20 (Non-Reasoning): 74.8 (#83)
| Benchmark | Claude Haiku 5.5 | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Instruction Following | — | 1420 |
Long Context Not comparable
Claude Haiku 5.5: —, Grok 4.20 (Non-Reasoning): 45.5 (#34)
| Benchmark | Claude Haiku 5.5 | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| CL-bench | — | 22.2% |
| CL-bench Life | — | 11.9% |
| LMArena Longer Query | — | 1437 |
Writing & Preference Not comparable
Claude Haiku 5.5: —, Grok 4.20 (Non-Reasoning): 65.7 (#44)
| Benchmark | Claude Haiku 5.5 | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Text | — | 1451 |
| LMArena Creative Writing | — | 1438 |
| EQ-Bench Creative Writing | — | 1574 |
| LMArena Multi-Turn | — | 1456 |
Frequently asked questions
Is Claude Haiku 5.5 better than Grok 4.20 (Non-Reasoning)?
Claude Haiku 5.5 and Grok 4.20 (Non-Reasoning) score almost the same on the Noometry Index (49.5 vs 48.6), so choose on price, context window or the category you care about most.
Which is cheaper, Claude Haiku 5.5 or Grok 4.20 (Non-Reasoning)?
Claude Haiku 5.5 is cheaper. It lists at $0.10 per million input tokens and $0.50 per million output tokens; Grok 4.20 (Non-Reasoning) lists at $1.25 and $2.50.
Is Claude Haiku 5.5 or Grok 4.20 (Non-Reasoning) better for coding?
Claude Haiku 5.5 scores higher on coding benchmarks: 49.2 versus 42.1 in the Noometry coding category.
Which has the bigger context window?
Both accept 1M tokens.
How many benchmarks do Claude Haiku 5.5 and Grok 4.20 (Non-Reasoning) share?
7 benchmarks have published results for both models. Claude Haiku 5.5 has 9 scored results on Noometry and Grok 4.20 (Non-Reasoning) has 46.