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Compare performance benchmarks, coding intelligence, reasoning evaluations, context limits, and API economics between Claude Haiku 5.5 (Anthropic) and Step 5 Preview (StepFun).
| Metric / Capability | Claude Haiku 5.5 | Step 5 Preview |
|---|---|---|
| Developer / Organization | Anthropic | StepFun |
| Release Date | 2026-10-07 | 2026-10-08 |
| Deployment / Weights | Proprietary Cloud API | Open Weights |
| Context Window | 1M tokens (1,000,000 tokens) | 1.0M tokens (1,048,576 tokens) |
| Input Pricing (/1M Tokens) | $0.1 | Free (Open Weights) |
| Output Pricing (/1M Tokens) | $0.5 | Free (Open Weights) |
| Benchmark / Domain | Claude Haiku 5.5 | Step 5 Preview | Advantage |
|---|---|---|---|
Artificial Analysis Intelligence Index Composite index aggregating 10+ evaluations of general reasoning and knowledge. | 43.4% | 43.7% | Step 5 Preview (+1%) |
Artificial Analysis Coding Agent Index v2.0 Composite index of coding-agent systems (model + harness) across FrontierCode v1.1, SWE-Atlas-QnA, and Terminal-Bench v4. | 37.3% | 43.1% | Step 5 Preview (+16%) |
Terminal-Bench 4.0 Sandboxed command-line tasks requiring shell and file-system operation. | 39.2% | 33.3% | Claude Haiku 5.5 (+18%) |
ARC-AGI-2 Novel visual grid puzzles requiring abstract rule induction. | 61.3% | — | — |
GPQA Diamond Graduate-level physics, chemistry, and biology questions written by domain experts. | — | 93.5% | — |
Humanity's Last Exam Expert-written questions across hundreds of disciplines designed to resist saturation. | 45.9% | 46.5% | Step 5 Preview (+1%) |
FrontierMath v2 (Tiers 1-3) Unpublished, research-level mathematics problems across Tiers 1-3. | 75.1% | — | — |
Design Arena ELO Human-preference ELO across UI, 3D, data-visualization, and game-dev generations. | 1344 | — | — |
Step 5 Preview outperforms Claude Haiku 5.5 across 3 evaluated benchmarks compared to 1 for Claude Haiku 5.5, excelling in Artificial Analysis Intelligence Index, Artificial Analysis Coding Agent Index v2.0, Humanity's Last Exam.
Step 5 Preview has the larger context capacity of 1.0M tokens (1,048,576 tokens), compared to 1M tokens for Claude Haiku 5.5.
Step 5 Preview is more economical. Input tokens cost $Free (Open Weights)/M tokens compared to $0.1/M tokens for Claude Haiku 5.5.
Claude Haiku 5.5 is a proprietary cloud API. Step 5 Preview is an open-weights model.
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