# GPT-6 Astra vs Step 5 Preview

> Side-by-side benchmark comparison for GPT-6 Astra and Step 5 Preview across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-6-astra-vs-step-5-preview
- Last updated: September 21, 2026

- Shared sourced benchmarks: 6
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Pick GPT-6 Astra if you want the stronger benchmark profile. Step 5 Preview only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- GPT-6 Astra leads overall 83.63 to 72.
- The clearest category separation is in multimodal & grounded, where the averages are 82.9 for GPT-6 Astra and 61.2 for Step 5 Preview.
- The biggest single benchmark swing is Agents' Last Exam in Agentic, with scores of 59.3% and 29.5%.
- Step 5 Preview is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- GPT-6 Astra also has the larger context window at 1.05M.

## Model Snapshot

| Property | GPT-6 Astra | Step 5 Preview |
|----------|----------|----------|
| Creator | OpenAI | StepFun |
| Type | Proprietary | Pending |
| Reasoning | Reasoning | Reasoning |
| Context | 1.05M | 1M |
| Overall Score | 83.63 | null |
| Benchmarks Covered | 27 | 22 |
| Pricing (input/output) | $10.00 / $50.00 | $1.00 / $2.70 |

## Category Breakdown

### Agentic

- Winner: Coming soon
- GPT-6 Astra public-lane score: 70.6 (Supported · #5/154)
- Step 5 Preview public-lane score: Coming soon

| Benchmark | GPT-6 Astra | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| BrowseComp | 91.5% | 88.7% | GPT-6 Astra |
| OSWorld 2.0 | 72.6% | Coming soon | Coming soon |
| Terminal-Bench 4.0 | 57.90% | 33.30% | GPT-6 Astra |
| Terminal-Bench-Science 0.1 | 64.6% | Coming soon | Coming soon |
| ExploitGym | 42.4% | Coming soon | Coming soon |
| Agents' Last Exam | 59.3% | 29.5% | GPT-6 Astra |
| AutomationBench | 41.4% | 44.0% | Step 5 Preview |
| HLE w/ tools | 57.2% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 87.3% | Coming soon | Coming soon |
| ApprenticeBench | 68% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 85.0% | Coming soon |
| CyberGym | Coming soon | 84.7% | 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 |

### Coding

- Winner: Coming soon
- GPT-6 Astra public-lane score: 77 (Supported · #3/156)
- Step 5 Preview public-lane score: Coming soon

| Benchmark | GPT-6 Astra | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| DeepSWE | 74.1% | 67.7% | GPT-6 Astra |
| FrontierCode 1.1 Main | 53.3% | Coming soon | Coming soon |
| FrontierCode 1.1 Extended | 64.5% | Coming soon | Coming soon |
| FrontierSWE v2 | 65.5% | Coming soon | Coming soon |
| 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: Coming soon
- GPT-6 Astra public-lane score: 89.5 (#1/19)
- Step 5 Preview public-lane score: 78.5 (Unranked · 2 rankable rows)

| Benchmark | GPT-6 Astra | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-1 | 98.50% | Coming soon | Coming soon |
| ARC-AGI-2 | 95% | Coming soon | Coming soon |
| ARC-AGI-3 | 62.7% | Coming soon | Coming soon |
| GeneBench-Pro | 37.8% | Coming soon | Coming soon |
| MRCR v2 256K-512K | 100.0% | Coming soon | Coming soon |
| MRCR v2 512K-1M | 96.3% | Coming soon | Coming soon |
| CritPt | Coming soon | 20.9% | Coming soon |

### Multimodal & Grounded

- Winner: Coming soon
- GPT-6 Astra public-lane score: 82.9 (Unranked · 3 rankable rows)
- Step 5 Preview public-lane score: 61.2 (#28/49)

| Benchmark | GPT-6 Astra | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| ScreenSpot Pro | 92.7% | Coming soon | Coming soon |
| BenchCAD Vision2Code (tools) | 0.959 | Coming soon | Coming soon |
| OfficeQA Pro | Coming soon | 60.3% | Coming soon |
| MMMU-Pro | Coming soon | 76% | Coming soon |

### Knowledge

- Winner: Coming soon
- GPT-6 Astra public-lane score: 82.8 (Supported · #3/186)
- Step 5 Preview public-lane score: Coming soon

| Benchmark | GPT-6 Astra | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 96% | Coming soon | Coming soon |
| GPQA-D | 96.0% | 93.5% | GPT-6 Astra |
| HealthBench Professional | 63.4% | Coming soon | Coming soon |
| HealthBench Hard | 36.3% | Coming soon | Coming soon |
| HLE | Coming soon | 46.5% | Coming soon |

### Mathematics

- Winner: Coming soon
- GPT-6 Astra public-lane score: 85 (Unranked · 1 rankable row)
- Step 5 Preview public-lane score: Coming soon

| Benchmark | GPT-6 Astra | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tier 4) | 97.600% | Coming soon | Coming soon |

## FAQ

### Which is better overall, GPT-6 Astra or Step 5 Preview?

GPT-6 Astra is ahead overall on BenchLM right now.

### Where is the biggest gap between GPT-6 Astra and Step 5 Preview?

The widest category gap is in multimodal & grounded, where the averages are 82.9 for GPT-6 Astra and 61.2 for Step 5 Preview.

### How many benchmarks does GPT-6 Astra cover on BenchLM?

GPT-6 Astra currently has 27 sourced benchmark scores on BenchLM.

### How many benchmarks does Step 5 Preview cover on BenchLM?

Step 5 Preview currently has 22 sourced benchmark scores on BenchLM.

## Related Comparisons

- [GPT-6 Astra vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-gpt-6-astra)
- [Step 5 Preview vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-step-5-preview)
- [GPT-6 Astra vs Claude Opus 5](/compare/claude-opus-5-vs-gpt-6-astra)
- [Step 5 Preview vs Claude Opus 5](/compare/claude-opus-5-vs-step-5-preview)

## Explore More

- [GPT-6 Astra profile](/models/gpt-6-astra)
- [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)