# Claude Haiku 4.5 vs Step 5 Preview

> Step 5 Preview is the stronger model overall, scoring 47.9 to 39.5 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-haiku-4-5-vs-step-5-preview
- Last updated: 2026-10-12
- Shared benchmarks: 16

## Summary

- They share 16 benchmarks with published results for both. Claude Haiku 4.5 scores higher in 0 categories and Step 5 Preview in 9 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Step 5 Preview leads 40.0 to 15.1.
- The biggest single-benchmark swing is CritPt: 0% for Claude Haiku 4.5 and 20.9% for Step 5 Preview.
- Step 5 Preview is cheaper at $1 / $2.70 per million input/output tokens, against $1 / $5 for Claude Haiku 4.5.
- Step 5 Preview accepts more context: 1.02M tokens versus 200K.

## Snapshot

| | Claude Haiku 4.5 | Step 5 Preview |
|---|---|---|
| Provider | Anthropic | StepFun |
| Noometry Index | 39.5 | 47.9 |
| Rank | 165 | 58 |
| Context | 200K | 1.02M |
| Input $/M | $1 | $1 |
| Output $/M | $5 | $2.70 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Haiku 4.5: 44.0 (#78)
- Step 5 Preview: 51.8 (#36)

| Benchmark | Claude Haiku 4.5 | Step 5 Preview |
|---|---|---|
| LMArena WebDev | 1330 | 1564 |
| SciCode | 43.3% | 58.9% |
| LMArena Coding | 1453 | 1480 |
| SWE-bench Verified (bash only) | 66.6% | — |
| SWE-bench Multilingual | 64.7% | — |
| WeirdML | 45.4% | — |
| ALE-Bench | 653.48 | — |

## Agentic & Tool Use

- Claude Haiku 4.5: 33.6 (#52)
- Step 5 Preview: —

| Benchmark | Claude Haiku 4.5 | Step 5 Preview |
|---|---|---|
| Terminal-Bench | 35.5% | — |
| Berkeley Function Calling Leaderboard | 68.7% | — |
| DeepResearch Bench | 45.5% | — |
| BALROG | 31.2% | — |
| ExploitBench | 13.7% | — |
| Vending-Bench 2 | 458.89 | — |

## Reasoning

- Claude Haiku 4.5: 15.1 (#320)
- Step 5 Preview: 40.0 (#57)

| Benchmark | Claude Haiku 4.5 | Step 5 Preview |
|---|---|---|
| CritPt | 0% | 20.9% |
| LMArena Hard Prompts | 1420 | 1465 |
| ARC-AGI-2 | 4% | — |
| NYT Connections (extended) | 14.3% | — |
| ARC-AGI-1 | 47.7% | — |
| Chess Puzzles | 8% | — |
| DTBench | 73.6% | — |
| LMCA | 30.9% | — |
| Epoch Capabilities Index | 142.41 | — |
| ForecastBench | 61.4 | — |

## Math

- Claude Haiku 4.5: 44.9 (#78)
- Step 5 Preview: 46.1 (#72)

| Benchmark | Claude Haiku 4.5 | Step 5 Preview |
|---|---|---|
| LMArena Math | 1396 | 1470 |
| OTIS Mock AIME 2024-2025 | 66.7% | — |
| ProofBench | — | 42% |
| Omni-MATH | 56.1% | — |
| MATH Level 5 | 96.4% | — |
| FrontierMath (Feb 2025 set) | 5.9% | — |
| FrontierMath Tier 4 (v1) | 2.1% | — |

## Knowledge

- Claude Haiku 4.5: 37.7 (#153)
- Step 5 Preview: 41.2 (#112)

| Benchmark | Claude Haiku 4.5 | Step 5 Preview |
|---|---|---|
| LMArena Expert | 1442 | 1470 |
| GPQA Diamond | 71.2% | — |
| SimpleQA Verified | 13.2% | — |
| MMLU-Pro | 77.7% | — |
| Vectara Hallucination Rate | 9.8% | — |
| GPQA (HELM) | 60.5% | — |

## Multimodal

- Claude Haiku 4.5: 26.8 (#118)
- Step 5 Preview: 41.0 (#41)

| Benchmark | Claude Haiku 4.5 | Step 5 Preview |
|---|---|---|
| LMArena Vision | — | 1267 |
| Blueprint-Bench 2 | 0% | — |
| LMArena Document | 1420 | — |

## Multilingual

- Claude Haiku 4.5: 49.9 (#129)
- Step 5 Preview: 53.8 (#54)

| Benchmark | Claude Haiku 4.5 | Step 5 Preview |
|---|---|---|
| LMArena Non-English | 1377 | 1432 |
| LMArena Chinese | 1417 | 1519 |
| LMArena Russian | 1381 | 1436 |
| LMArena Spanish | 1420 | 1439 |
| LMArena French | 1408 | — |
| LMArena German | 1375 | — |
| LMArena Japanese | 1339 | — |
| LMArena Korean | 1347 | — |

## Instruction Following

- Claude Haiku 4.5: 71.4 (#149)
- Step 5 Preview: 76.0 (#50)

| Benchmark | Claude Haiku 4.5 | Step 5 Preview |
|---|---|---|
| LMArena Instruction Following | 1414 | 1444 |
| IFEval | 80.1% | — |

## Long Context

- Claude Haiku 4.5: 43.6 (#92)
- Step 5 Preview: 44.5 (#64)

| Benchmark | Claude Haiku 4.5 | Step 5 Preview |
|---|---|---|
| LMArena Longer Query | 1427 | 1455 |

## Writing & Preference

- Claude Haiku 4.5: 57.9 (#123)
- Step 5 Preview: 62.8 (#71)

| Benchmark | Claude Haiku 4.5 | Step 5 Preview |
|---|---|---|
| LMArena Text | 1396 | 1442 |
| LMArena Creative Writing | 1372 | 1410 |
| LMArena Multi-Turn | 1409 | 1447 |
| WildBench | 83.9% | — |
| EQ-Bench 4 | 1064 | — |

## FAQ

### Is Claude Haiku 4.5 better than Step 5 Preview?

Step 5 Preview is the stronger model overall, scoring 47.9 to 39.5 on the Noometry Index.

### Which is cheaper, Claude Haiku 4.5 or Step 5 Preview?

Step 5 Preview is cheaper. It lists at $1 per million input tokens and $2.70 per million output tokens; Claude Haiku 4.5 lists at $1 and $5.

### Is Claude Haiku 4.5 or Step 5 Preview better for coding?

Step 5 Preview scores higher on coding benchmarks: 51.8 versus 44.0 in the Noometry coding category.

### Which has the bigger context window?

Step 5 Preview does, with 1.02M tokens against 200K.

### How many benchmarks do Claude Haiku 4.5 and Step 5 Preview share?

16 benchmarks have published results for both models. Claude Haiku 4.5 has 53 scored results on Noometry and Step 5 Preview has 18.