Model comparison
Claude Haiku 5.5 vs Grok 4
Claude Haiku 5.5 is the stronger model overall, scoring 49.5 to 48.1 on the Noometry Index.
Last verified . 2 shared benchmarks.
Summary
- They share 2 benchmarks with published results for both. Claude Haiku 5.5 scores higher in 2 categories and Grok 4 in 3 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Haiku 5.5 leads 73.6 to 48.4.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 98.9% for Claude Haiku 5.5 and 84% for Grok 4.
Side by side
| Claude Haiku 5.5 | Grok 4 | |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 49.5 | 48.1 |
| Released | 2026-10-07 | 2025-07-09 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | — |
| Max output | 128K | — |
| Input $ / M tokens | $0.10 | — |
| Output $ / M tokens | $0.50 | — |
| Results tracked | 9 | 48 |
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Category by category
Coding Grok 4 leads
Claude Haiku 5.5: 49.2 (#50), Grok 4: 50.3 (#46)
| Benchmark | Claude Haiku 5.5 | Grok 4 |
|---|---|---|
| Aider Polyglot | — | 79.6% |
| LMArena WebDev | 1587 | — |
| WeirdML | — | 45.7% |
| LMArena Coding | — | 1408 |
Agentic & Tool Use Not comparable
Claude Haiku 5.5: —, Grok 4: 32.3 (#68)
| Benchmark | Claude Haiku 5.5 | Grok 4 |
|---|---|---|
| Terminal-Bench | — | 27.2% |
| Berkeley Function Calling Leaderboard | — | 63% |
| GDPval | — | 21.1% |
| Cybench | — | 43% |
| DeepResearch Bench | — | 47.3% |
| BALROG | — | 43.6% |
| LMArena Search | — | 1142 |
| METR Time Horizons | — | 66.6% |
Reasoning Grok 4 leads
Claude Haiku 5.5: 35.2 (#69), Grok 4: 36.7 (#65)
| Benchmark | Claude Haiku 5.5 | Grok 4 |
|---|---|---|
| ARC-AGI-2 | — | 16% |
| SimpleBench | — | 60.5% |
| Kagi LLM Benchmark | — | 73.6% |
| NYT Connections (extended) | 65.7% | — |
| ARC-AGI-1 | — | 66.7% |
| Chess Puzzles | — | 28% |
| LMArena Hard Prompts | — | 1409 |
| Mystery Game Puzzles | 30% | — |
| Epoch Capabilities Index | — | 146.44 |
| ForecastBench | — | 60.9 |
Math Claude Haiku 5.5 leads
Claude Haiku 5.5: 73.6 (#18), Grok 4: 48.4 (#64)
| Benchmark | Claude Haiku 5.5 | Grok 4 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 98.9% | 84% |
| FrontierMath (Tiers 1-3) | 75.1% | — |
| FrontierMath Tier 4 | 46.3% | — |
| Omni-MATH | — | 60.3% |
| LMArena Math | — | 1422 |
| FrontierMath (Feb 2025 set) | — | 19.7% |
| FrontierMath Tier 4 (v1) | — | 2.1% |
Knowledge Grok 4 leads
Claude Haiku 5.5: 50.8 (#70), Grok 4: 53.8 (#55)
| Benchmark | Claude Haiku 5.5 | Grok 4 |
|---|---|---|
| GPQA Diamond | 89.6% | 87% |
| SimpleQA Verified | 23.8% | — |
| MMLU-Pro | — | 85.1% |
| Confabulations | — | 12.4% |
| GPQA (HELM) | — | 72.7% |
| LMArena Expert | — | 1415 |
Multimodal Claude Haiku 5.5 leads
Claude Haiku 5.5: 43.7 (#21), Grok 4: 33.7 (#94)
| Benchmark | Claude Haiku 5.5 | Grok 4 |
|---|---|---|
| LMArena Vision | — | 1210 |
| GeoBench | — | 45% |
| Furniture Assembly | 47.5% | — |
Multilingual Not comparable
Claude Haiku 5.5: —, Grok 4: 51.8 (#103)
| Benchmark | Claude Haiku 5.5 | Grok 4 |
|---|---|---|
| LMArena Non-English | — | 1403 |
| LMArena Chinese | — | 1427 |
| LMArena French | — | 1418 |
| LMArena German | — | 1429 |
| LMArena Japanese | — | 1394 |
| LMArena Korean | — | 1377 |
| LMArena Russian | — | 1410 |
| LMArena Spanish | — | 1420 |
Instruction Following Not comparable
Claude Haiku 5.5: —, Grok 4: 79.2 (#5)
| Benchmark | Claude Haiku 5.5 | Grok 4 |
|---|---|---|
| IFEval | — | 94.9% |
| LMArena Instruction Following | — | 1387 |
Long Context Not comparable
Claude Haiku 5.5: —, Grok 4: 63.1 (#4)
| Benchmark | Claude Haiku 5.5 | Grok 4 |
|---|---|---|
| Fiction.LiveBench | — | 94.4% |
| LMArena Longer Query | — | 1409 |
Writing & Preference Not comparable
Claude Haiku 5.5: —, Grok 4: 58.5 (#116)
| Benchmark | Claude Haiku 5.5 | Grok 4 |
|---|---|---|
| LMArena Text | — | 1411 |
| LMArena Creative Writing | — | 1397 |
| Short-Story Creative Writing | — | 76.9% |
| WildBench | — | 79.7% |
| LMArena Multi-Turn | — | 1416 |
Frequently asked questions
Is Claude Haiku 5.5 better than Grok 4?
Claude Haiku 5.5 is the stronger model overall, scoring 49.5 to 48.1 on the Noometry Index.
Is Claude Haiku 5.5 or Grok 4 better for coding?
Grok 4 scores higher on coding benchmarks: 50.3 versus 49.2 in the Noometry coding category.
How many benchmarks do Claude Haiku 5.5 and Grok 4 share?
2 benchmarks have published results for both models. Claude Haiku 5.5 has 9 scored results on Noometry and Grok 4 has 48.