Model comparison
Claude Haiku 5.5 vs Step 5 Preview
Claude Haiku 5.5 is the stronger model overall, scoring 49.5 to 47.9 on the Noometry Index.
Last verified . 1 shared benchmarks.
StepFunSummary
- They share 1 benchmark with published results for both. Claude Haiku 5.5 scores higher in 3 categories and Step 5 Preview 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 46.1.
- Claude Haiku 5.5 is cheaper at $0.10 / $0.50 per million input/output tokens, against $1 / $2.70 for Step 5 Preview.
- Step 5 Preview accepts more context: 1.02M tokens versus 1M.
Side by side
| Claude Haiku 5.5 | Step 5 Preview | |
|---|---|---|
| Provider | Anthropic | StepFun |
| Noometry Index | 49.5 | 47.9 |
| Released | 2026-10-07 | 2026-09-16 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 1.02M |
| Max output | 128K | 66K |
| Input $ / M tokens | $0.10 | $1 |
| Output $ / M tokens | $0.50 | $2.70 |
| Results tracked | 9 | 18 |
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Category by category
Coding Step 5 Preview leads
Claude Haiku 5.5: 49.2 (#50), Step 5 Preview: 51.8 (#36)
| Benchmark | Claude Haiku 5.5 | Step 5 Preview |
|---|---|---|
| LMArena WebDev | 1587 | 1564 |
| SciCode | — | 58.9% |
| LMArena Coding | — | 1480 |
Reasoning Step 5 Preview leads
Claude Haiku 5.5: 35.2 (#69), Step 5 Preview: 40.0 (#57)
| Benchmark | Claude Haiku 5.5 | Step 5 Preview |
|---|---|---|
| NYT Connections (extended) | 65.7% | — |
| CritPt | — | 20.9% |
| LMArena Hard Prompts | — | 1465 |
| Mystery Game Puzzles | 30% | — |
Math Claude Haiku 5.5 leads
Claude Haiku 5.5: 73.6 (#18), Step 5 Preview: 46.1 (#72)
| Benchmark | Claude Haiku 5.5 | Step 5 Preview |
|---|---|---|
| FrontierMath (Tiers 1-3) | 75.1% | — |
| FrontierMath Tier 4 | 46.3% | — |
| OTIS Mock AIME 2024-2025 | 98.9% | — |
| ProofBench | — | 42% |
| LMArena Math | — | 1470 |
Knowledge Claude Haiku 5.5 leads
Claude Haiku 5.5: 50.8 (#70), Step 5 Preview: 41.2 (#112)
| Benchmark | Claude Haiku 5.5 | Step 5 Preview |
|---|---|---|
| GPQA Diamond | 89.6% | — |
| SimpleQA Verified | 23.8% | — |
| LMArena Expert | — | 1470 |
Multimodal Claude Haiku 5.5 leads
Claude Haiku 5.5: 43.7 (#21), Step 5 Preview: 41.0 (#41)
| Benchmark | Claude Haiku 5.5 | Step 5 Preview |
|---|---|---|
| LMArena Vision | — | 1267 |
| Furniture Assembly | 47.5% | — |
Multilingual Not comparable
Claude Haiku 5.5: —, Step 5 Preview: 53.8 (#54)
| Benchmark | Claude Haiku 5.5 | Step 5 Preview |
|---|---|---|
| LMArena Non-English | — | 1432 |
| LMArena Chinese | — | 1519 |
| LMArena Russian | — | 1436 |
| LMArena Spanish | — | 1439 |
Instruction Following Not comparable
Claude Haiku 5.5: —, Step 5 Preview: 76.0 (#50)
| Benchmark | Claude Haiku 5.5 | Step 5 Preview |
|---|---|---|
| LMArena Instruction Following | — | 1444 |
Long Context Not comparable
Claude Haiku 5.5: —, Step 5 Preview: 44.5 (#64)
| Benchmark | Claude Haiku 5.5 | Step 5 Preview |
|---|---|---|
| LMArena Longer Query | — | 1455 |
Writing & Preference Not comparable
Claude Haiku 5.5: —, Step 5 Preview: 62.8 (#71)
| Benchmark | Claude Haiku 5.5 | Step 5 Preview |
|---|---|---|
| LMArena Text | — | 1442 |
| LMArena Creative Writing | — | 1410 |
| LMArena Multi-Turn | — | 1447 |
Frequently asked questions
Is Claude Haiku 5.5 better than Step 5 Preview?
Claude Haiku 5.5 is the stronger model overall, scoring 49.5 to 47.9 on the Noometry Index.
Which is cheaper, Claude Haiku 5.5 or Step 5 Preview?
Claude Haiku 5.5 is cheaper. It lists at $0.10 per million input tokens and $0.50 per million output tokens; Step 5 Preview lists at $1 and $2.70.
Is Claude Haiku 5.5 or Step 5 Preview better for coding?
Step 5 Preview scores higher on coding benchmarks: 51.8 versus 49.2 in the Noometry coding category.
Which has the bigger context window?
Step 5 Preview does, with 1.02M tokens against 1M.
How many benchmarks do Claude Haiku 5.5 and Step 5 Preview share?
1 benchmark has published results for both models. Claude Haiku 5.5 has 9 scored results on Noometry and Step 5 Preview has 18.