Model comparison
Claude Haiku 5.5 vs Grok 4.5
Grok 4.5 is the stronger model overall, scoring 55.0 to 49.5 on the Noometry Index. Claude Haiku 5.5 costs 15× less per token, which makes it the better buy when Grok 4.5's lead doesn't matter for your workload.
Last verified . 8 shared benchmarks.
Summary
- They share 8 benchmarks with published results for both. Claude Haiku 5.5 scores higher in 2 categories and Grok 4.5 in 3 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.5 leads 56.1 to 35.2.
- The biggest single-benchmark swing is Furniture Assembly: 47.5% for Claude Haiku 5.5 and 22.5% for Grok 4.5.
- Claude Haiku 5.5 is cheaper at $0.10 / $0.50 per million input/output tokens, against $2 / $6 for Grok 4.5.
- Claude Haiku 5.5 accepts more context: 1M tokens versus 500K.
Side by side
| Claude Haiku 5.5 | Grok 4.5 | |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 49.5 | 55.0 |
| Released | 2026-10-07 | 2026-07-08 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 500K |
| Max output | 128K | 500K |
| Input $ / M tokens | $0.10 | $2 |
| Output $ / M tokens | $0.50 | $6 |
| Results tracked | 9 | 52 |
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Category by category
Coding Grok 4.5 leads
Claude Haiku 5.5: 49.2 (#50), Grok 4.5: 52.2 (#35)
| Benchmark | Claude Haiku 5.5 | Grok 4.5 |
|---|---|---|
| LMArena WebDev | 1587 | 1553 |
| DeepSWE | — | 53.8% |
| FrontierCode | — | 42.4% |
| SciCode | — | 54.1% |
| WeirdML | — | 46.4% |
| LMArena Coding | — | 1474 |
| ALE-Bench | — | 1,309 |
Agentic & Tool Use Not comparable
Claude Haiku 5.5: —, Grok 4.5: 44.4 (#17)
| Benchmark | Claude Haiku 5.5 | Grok 4.5 |
|---|---|---|
| APEX-Agents | — | 56.2% |
| τ²-bench Banking | — | 47.9% |
| PostTrainBench | — | 23.4% |
| GBAEval | — | 65.4% |
| GDP.pdf | — | 14% |
| LMArena Search | — | 1213 |
| Vending-Bench 2 | — | 3,887 |
Reasoning Grok 4.5 leads
Claude Haiku 5.5: 35.2 (#69), Grok 4.5: 56.1 (#25)
| Benchmark | Claude Haiku 5.5 | Grok 4.5 |
|---|---|---|
| NYT Connections (extended) | 65.7% | 79.9% |
| ARC-AGI-2 | — | 52.6% |
| SimpleBench | — | 70% |
| Kagi LLM Benchmark | — | 83.5% |
| ARC-AGI-1 | — | 87.2% |
| CritPt | — | 15.4% |
| Chess Puzzles | — | 36% |
| LMArena Hard Prompts | — | 1462 |
| Mystery Game Puzzles | 30% | — |
| DTBench | — | 96.5% |
| LMCA | — | 45.2% |
| Surface Evolver Bench | — | 74.4% |
| Epoch Capabilities Index | — | 153.92 |
Math Claude Haiku 5.5 leads
Claude Haiku 5.5: 73.6 (#18), Grok 4.5: 60.9 (#35)
| Benchmark | Claude Haiku 5.5 | Grok 4.5 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 75.1% | 57.2% |
| FrontierMath Tier 4 | 46.3% | 24.4% |
| OTIS Mock AIME 2024-2025 | 98.9% | 97.8% |
| ProofBench | — | 31% |
| LMArena Math | — | 1459 |
Knowledge Grok 4.5 leads
Claude Haiku 5.5: 50.8 (#70), Grok 4.5: 62.3 (#24)
| Benchmark | Claude Haiku 5.5 | Grok 4.5 |
|---|---|---|
| GPQA Diamond | 89.6% | 93.4% |
| SimpleQA Verified | 23.8% | 48.3% |
| LMArena Expert | — | 1466 |
Multimodal Claude Haiku 5.5 leads
Claude Haiku 5.5: 43.7 (#21), Grok 4.5: 37.6 (#72)
| Benchmark | Claude Haiku 5.5 | Grok 4.5 |
|---|---|---|
| Furniture Assembly | 47.5% | 22.5% |
| LMArena Vision | — | 1288 |
| Blueprint-Bench 2 | — | 27.3% |
| LMArena Document | — | 1452 |
Multilingual Not comparable
Claude Haiku 5.5: —, Grok 4.5: 54.4 (#42)
| Benchmark | Claude Haiku 5.5 | Grok 4.5 |
|---|---|---|
| LMArena Non-English | — | 1440 |
| LMArena Chinese | — | 1496 |
| LMArena French | — | 1456 |
| LMArena German | — | 1446 |
| LMArena Japanese | — | 1428 |
| LMArena Korean | — | 1404 |
| LMArena Russian | — | 1448 |
| LMArena Spanish | — | 1450 |
Instruction Following Not comparable
Claude Haiku 5.5: —, Grok 4.5: 76.0 (#48)
| Benchmark | Claude Haiku 5.5 | Grok 4.5 |
|---|---|---|
| LMArena Instruction Following | — | 1446 |
Long Context Not comparable
Claude Haiku 5.5: —, Grok 4.5: 44.8 (#56)
| Benchmark | Claude Haiku 5.5 | Grok 4.5 |
|---|---|---|
| LMArena Longer Query | — | 1463 |
Writing & Preference Not comparable
Claude Haiku 5.5: —, Grok 4.5: 65.8 (#42)
| Benchmark | Claude Haiku 5.5 | Grok 4.5 |
|---|---|---|
| LMArena Text | — | 1448 |
| LMArena Creative Writing | — | 1442 |
| EQ-Bench Creative Writing | — | 1579 |
| LMArena Multi-Turn | — | 1456 |
Frequently asked questions
Is Claude Haiku 5.5 better than Grok 4.5?
Grok 4.5 is the stronger model overall, scoring 55.0 to 49.5 on the Noometry Index. Claude Haiku 5.5 costs 15× less per token, which makes it the better buy when Grok 4.5's lead doesn't matter for your workload.
Which is cheaper, Claude Haiku 5.5 or Grok 4.5?
Claude Haiku 5.5 is cheaper. It lists at $0.10 per million input tokens and $0.50 per million output tokens; Grok 4.5 lists at $2 and $6.
Is Claude Haiku 5.5 or Grok 4.5 better for coding?
Grok 4.5 scores higher on coding benchmarks: 52.2 versus 49.2 in the Noometry coding category.
Which has the bigger context window?
Claude Haiku 5.5 does, with 1M tokens against 500K.
How many benchmarks do Claude Haiku 5.5 and Grok 4.5 share?
8 benchmarks have published results for both models. Claude Haiku 5.5 has 9 scored results on Noometry and Grok 4.5 has 52.