Model comparison
Claude Haiku 4.5 vs Step 3
Claude Haiku 4.5 and Step 3 score almost the same on the Noometry Index (39.3 vs 39.9), so choose on price, context window or the category you care about most.
Last verified . 15 shared benchmarks.
StepFunSummary
- They share 15 benchmarks with published results for both. Claude Haiku 4.5 scores higher in 7 categories and Step 3 in 2 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Step 3 leads 27.6 to 15.1.
- Step 3 has downloadable open weights; the other is API-only.
Side by side
| Claude Haiku 4.5 | Step 3 | |
|---|---|---|
| Provider | Anthropic | StepFun |
| Noometry Index | 39.3 | 39.9 |
| Released | 2025-10-15 | — |
| Weights | Proprietary | Open |
| Context window | 200K | — |
| Max output | 64K | — |
| Input $ / M tokens | $1 | — |
| Output $ / M tokens | $5 | — |
| Results tracked | 53 | 17 |
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Category by category
Coding Claude Haiku 4.5 leads
Claude Haiku 4.5: 43.9 (#71), Step 3: 39.5 (#144)
| Benchmark | Claude Haiku 4.5 | Step 3 |
|---|---|---|
| LMArena Coding | 1454 | 1367 |
| SWE-bench Verified (bash only) | 66.6% | — |
| LMArena WebDev | 1330 | — |
| SWE-bench Multilingual | 64.7% | — |
| SciCode | 43.3% | — |
| WeirdML | 45.4% | — |
| ALE-Bench | 653.48 | — |
Agentic & Tool Use Not comparable
Claude Haiku 4.5: 33.5 (#50), Step 3: —
| Benchmark | Claude Haiku 4.5 | Step 3 |
|---|---|---|
| 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 Step 3 leads
Claude Haiku 4.5: 15.1 (#310), Step 3: 27.6 (#102)
| Benchmark | Claude Haiku 4.5 | Step 3 |
|---|---|---|
| LMArena Hard Prompts | 1420 | 1355 |
| ARC-AGI-2 | 4% | — |
| Kagi LLM Benchmark | — | 62.3% |
| NYT Connections (extended) | 14.3% | — |
| ARC-AGI-1 | 47.7% | — |
| CritPt | 0% | — |
| Chess Puzzles | 8% | — |
| DTBench | 73.6% | — |
| LMCA | 30.9% | — |
| Epoch Capabilities Index | 142.42 | — |
| ForecastBench | 61.4 | — |
Math Claude Haiku 4.5 leads
Claude Haiku 4.5: 43.0 (#69), Step 3: 34.9 (#148)
| Benchmark | Claude Haiku 4.5 | Step 3 |
|---|---|---|
| LMArena Math | 1395 | 1366 |
| OTIS Mock AIME 2024-2025 | 66.7% | — |
| 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 leads
Claude Haiku 4.5: 37.6 (#146), Step 3: 36.2 (#161)
| Benchmark | Claude Haiku 4.5 | Step 3 |
|---|---|---|
| LMArena Expert | 1443 | 1333 |
| GPQA Diamond | 71.2% | — |
| SimpleQA Verified | 13.2% | — |
| MMLU-Pro | 77.7% | — |
| Vectara Hallucination Rate | 9.8% | — |
| GPQA (HELM) | 60.5% | — |
Multimodal Step 3 leads
Claude Haiku 4.5: 27.0 (#111), Step 3: 34.9 (#81)
| Benchmark | Claude Haiku 4.5 | Step 3 |
|---|---|---|
| LMArena Vision | — | 1176 |
| Blueprint-Bench 2 | 0% | — |
| LMArena Document | 1420 | — |
Multilingual Claude Haiku 4.5 leads
Claude Haiku 4.5: 50.1 (#124), Step 3: 46.5 (#154)
| Benchmark | Claude Haiku 4.5 | Step 3 |
|---|---|---|
| LMArena Non-English | 1376 | 1327 |
| LMArena Chinese | 1415 | 1396 |
| LMArena German | 1377 | 1371 |
| LMArena Korean | 1346 | 1271 |
| LMArena Russian | 1380 | 1331 |
| LMArena Spanish | 1420 | 1372 |
| LMArena French | 1408 | — |
| LMArena Japanese | 1339 | — |
Instruction Following Claude Haiku 4.5 leads
Claude Haiku 4.5: 71.6 (#144), Step 3: 70.6 (#159)
| Benchmark | Claude Haiku 4.5 | Step 3 |
|---|---|---|
| LMArena Instruction Following | 1414 | 1332 |
| IFEval | 80.1% | — |
Long Context Claude Haiku 4.5 leads
Claude Haiku 4.5: 43.6 (#86), Step 3: 40.3 (#152)
| Benchmark | Claude Haiku 4.5 | Step 3 |
|---|---|---|
| LMArena Longer Query | 1427 | 1326 |
Writing & Preference Claude Haiku 4.5 leads
Claude Haiku 4.5: 58.1 (#119), Step 3: 54.5 (#146)
| Benchmark | Claude Haiku 4.5 | Step 3 |
|---|---|---|
| LMArena Text | 1396 | 1351 |
| LMArena Creative Writing | 1371 | 1322 |
| LMArena Multi-Turn | 1409 | 1340 |
| WildBench | 83.9% | — |
| EQ-Bench 4 | 1064 | — |
Frequently asked questions
Is Claude Haiku 4.5 better than Step 3?
Claude Haiku 4.5 and Step 3 score almost the same on the Noometry Index (39.3 vs 39.9), so choose on price, context window or the category you care about most.
Is Claude Haiku 4.5 or Step 3 better for coding?
Claude Haiku 4.5 scores higher on coding benchmarks: 43.9 versus 39.5 in the Noometry coding category.
How many benchmarks do Claude Haiku 4.5 and Step 3 share?
15 benchmarks have published results for both models. Claude Haiku 4.5 has 53 scored results on Noometry and Step 3 has 17.