# Pareto 26.10 Preview vs Step 5 Preview

> Side-by-side benchmark comparison for Pareto 26.10 Preview and Step 5 Preview across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/pareto-26-10-preview-vs-step-5-preview
- Last updated: October 1, 2026

- Shared sourced benchmarks: 3
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Evidence is too thin for a benchmark verdict: Pareto 26.10 Preview and Step 5 Preview share only 3 sourced benchmark rows.

## Summary

- Only 3 shared sourced benchmark rows are available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Step 5 Preview has the lower published output-token price.
- Step 5 Preview has the larger published context window at 1M.

## Model Snapshot

| Property | Pareto 26.10 Preview | Step 5 Preview |
|----------|----------|----------|
| Creator | Unbiased | StepFun |
| Type | Proprietary | Pending |
| Reasoning | Reasoning | Reasoning |
| Context | N/A | 1M |
| Independent public score (not head-to-head) | null | 70.35 |
| Benchmarks Covered | 3 | 22 |
| Pricing (input/output) | $2.50 / $7.50 | $1.00 / $2.70 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Pareto 26.10 Preview public-lane score: Coming soon
- Step 5 Preview public-lane score: 63.5 (Estimated · #17/119)

| Benchmark | Pareto 26.10 Preview | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 4.0 | 50.80% | 33.30% | Pareto 26.10 Preview |
| Terminal-Bench 2.1 | Coming soon | 85.0% | Coming soon |
| CyberGym | Coming soon | 84.7% | Coming soon |
| AutomationBench | Coming soon | 44.0% | Coming soon |
| Toolathlon-Verified | Coming soon | 74.1% | Coming soon |
| MCP Atlas | Coming soon | 85.6% | Coming soon |
| JobBench | Coming soon | 59.0% | Coming soon |
| APEX-Agents | Coming soon | 37.8% | Coming soon |
| DRACO | Coming soon | 83.3% | Coming soon |
| BrowseComp | Coming soon | 88.7% | Coming soon |
| Agents' Last Exam | Coming soon | 29.5% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Pareto 26.10 Preview public-lane score: Coming soon
- Step 5 Preview public-lane score: 61.5 (Estimated · #16/144)

| Benchmark | Pareto 26.10 Preview | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| DeepSWE | 69.9% | 67.7% | Pareto 26.10 Preview |
| Terminal-Bench 2.1 | Coming soon | 85.0% | Coming soon |
| SciCode | Coming soon | 58.9% | Coming soon |
| ProgramBench | Coming soon | 80.5% | Coming soon |
| sweMarathon | Coming soon | 72.7% | Coming soon |
| MLS-Bench Lite | Coming soon | 40.5% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Pareto 26.10 Preview public-lane score: Coming soon
- Step 5 Preview public-lane score: 79.6 (Unranked · 2 rankable rows)

| Benchmark | Pareto 26.10 Preview | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| CritPt | Coming soon | 20.9% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Pareto 26.10 Preview public-lane score: Coming soon
- Step 5 Preview public-lane score: 61.2 (#28/49)

| Benchmark | Pareto 26.10 Preview | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| OfficeQA Pro | Coming soon | 60.3% | Coming soon |
| MMMU-Pro | Coming soon | 76% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Pareto 26.10 Preview public-lane score: Coming soon
- Step 5 Preview public-lane score: 67.2 (Supported · #19/170)

| Benchmark | Pareto 26.10 Preview | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| GPQA-D | 92.4% | 93.5% | Step 5 Preview |
| HLE | Coming soon | 46.5% | Coming soon |

## FAQ

### Is there enough evidence to pick between Pareto 26.10 Preview and Step 5 Preview?

Not yet. The models share only 3 sourced benchmark rows, so this mirror reports the available measurements and metadata without naming a broad winner.

### What can I compare safely on this page?

Published pricing, context windows, model type, and individual shared benchmark rows are directly comparable. Independent overall scores and non-overlapping benchmark coverage are labeled separately and should not be read as a controlled head-to-head result.

## Related Comparisons

- [Pareto 26.10 Preview vs Pareto 26.9](/compare/pareto-26-10-preview-vs-pareto-26-9)
- [Step 5 Preview vs Pareto 26.9](/compare/pareto-26-9-vs-step-5-preview)
- [Pareto 26.10 Preview vs GPT-6 Astra](/compare/gpt-6-astra-vs-pareto-26-10-preview)
- [Step 5 Preview vs GPT-6 Astra](/compare/gpt-6-astra-vs-step-5-preview)

## Explore More

- [Pareto 26.10 Preview profile](/models/pareto-26-10-preview)
- [Step 5 Preview profile](/models/step-5-preview)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)