# GPT-5.6 Terra vs Hy4 preview

> Side-by-side benchmark comparison for GPT-5.6 Terra and Hy4 preview across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-6-terra-vs-hy4-preview
- Last updated: October 13, 2026

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

## Quick Verdict

GPT-5.6 Terra leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- GPT-5.6 Terra has the higher overall point estimate 69.75 to 60.86. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in knowledge, where the averages are 69.6 for GPT-5.6 Terra and 63.6 for Hy4 preview.
- The biggest single benchmark swing is Terminal-Bench 2.1 (Vals) in Agentic, with scores of 77.5% and 55.1%.
- Hy4 preview is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- GPT-5.6 Terra also has the larger context window at 1.05M.

## Model Snapshot

| Property | GPT-5.6 Terra | Hy4 preview |
|----------|----------|----------|
| Creator | OpenAI | Tencent |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1.05M | 1M |
| Overall Score | 69.75 | 60.86 |
| Benchmarks Covered | 34 | 30 |
| Pricing (input/output) | $2.00 / $12.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Directional only
- GPT-5.6 Terra public-lane score: 58.9 (Supported · #27/123)
- Hy4 preview public-lane score: 54.5 (Estimated · #37/123)

| Benchmark | GPT-5.6 Terra | Hy4 preview | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | 20.8% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 87.4% | 85.4% | GPT-5.6 Terra |
| BrowseComp | 87.5% | Coming soon | Coming soon |
| OSWorld 2.0 | 50.2% | Coming soon | Coming soon |
| CyberGym | 81.8% | 78.4% | GPT-5.6 Terra |
| ExploitGym | 23.2% | Coming soon | Coming soon |
| Toolathlon | 53.1% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 77.5% | 55.1% | GPT-5.6 Terra |
| ApprenticeBench | 16% | Coming soon | Coming soon |
| WideResearch | Coming soon | 83.9% | Coming soon |
| DRACO | Coming soon | 77.2% | Coming soon |
| MCP Atlas | Coming soon | 83.7% | Coming soon |
| Toolathlon-Verified | Coming soon | 74.1% | Coming soon |
| APEX-Agents | Coming soon | 37.1% | Coming soon |
| skillsBench | Coming soon | 62.9% | Coming soon |
| JobBench | Coming soon | 61.7% | Coming soon |
| Agents' Last Exam | Coming soon | 22.8% | Coming soon |
| AutomationBench | Coming soon | 32.1% | Coming soon |
| BankerToolBench | Coming soon | 78.6% | Coming soon |
| HLE w/ tools | Coming soon | 55.4% | Coming soon |
| CWE-bench v1 | Coming soon | 53.0% | Coming soon |

### Coding

- Winner: GPT-5.6 Terra
- GPT-5.6 Terra public-lane score: 62.3 (Supported · #14/148)
- Hy4 preview public-lane score: 57.1 (Supported · #26/148)

| Benchmark | GPT-5.6 Terra | Hy4 preview | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Pro | 63.4% | 65.7% | Hy4 preview |
| Terminal-Bench 2.1 | 87.4% | 85.4% | GPT-5.6 Terra |
| DeepSWE | 69.6% | 64.3% | GPT-5.6 Terra |
| FrontierCode 1.1 Extended | 55.8% | Coming soon | Coming soon |
| CursorBench 3.2 | 64.9% | Coming soon | Coming soon |
| VulcanBench v3 | 87.0% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 85.9% | Coming soon | Coming soon |
| SWE-bench (Vals) | 95.4% | Coming soon | Coming soon |
| CursorBench 4.0 | 41.3% | Coming soon | Coming soon |
| SWE Multilingual | Coming soon | 82.9% | Coming soon |
| NL2Repo | Coming soon | 58.9% | Coming soon |
| ProgramBench | Coming soon | 17.5% | Coming soon |
| PostTrain Bench | Coming soon | 35.6% | Coming soon |
| sweMarathon | Coming soon | 31.9% | Coming soon |

### Reasoning

- Winner: Not comparable
- GPT-5.6 Terra public-lane score: 69.1 (#23/29)
- Hy4 preview public-lane score: Coming soon

| Benchmark | GPT-5.6 Terra | Hy4 preview | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 83.9% | Coming soon | Coming soon |
| ARC-AGI-3 | 0.8% | Coming soon | Coming soon |
| ARC-AGI-1 | 96.50% | Coming soon | Coming soon |
| CritPt | Coming soon | 16.9% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- GPT-5.6 Terra public-lane score: 84.5 (#11/54)
- Hy4 preview public-lane score: 88.3 (Unranked · 1 rankable row)

| Benchmark | GPT-5.6 Terra | Hy4 preview | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 80.7% | Coming soon | Coming soon |
| MMMU-Pro w/ Python | 82% | Coming soon | Coming soon |
| OfficeQA Pro | Coming soon | 66.2% | Coming soon |

### Knowledge

- Winner: Directional only
- GPT-5.6 Terra public-lane score: 69.6 (Supported · #17/180)
- Hy4 preview public-lane score: 63.6 (Estimated · #39/180)

| Benchmark | GPT-5.6 Terra | Hy4 preview | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 92.9% | 92.3% | GPT-5.6 Terra |
| GPQA-D | 92.9% | 92.3% | GPT-5.6 Terra |
| HLE-Verified | 51.1% | Coming soon | Coming soon |
| LABBench2 | 81.2% | Coming soon | Coming soon |
| HealthBench Professional | 57.7% | Coming soon | Coming soon |
| HealthBench Hard | 32.7% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 90.9% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 86.7% | Coming soon | Coming soon |
| HLE | Coming soon | 55.4% | Coming soon |
| HLE w/o tools | Coming soon | 43.4% | Coming soon |

### Instruction Following

- Winner: Not comparable
- GPT-5.6 Terra public-lane score: 87.1 (#38/127)
- Hy4 preview public-lane score: Coming soon

### Mathematics

- Winner: Not comparable
- GPT-5.6 Terra public-lane score: 90.1 (Unranked · 3 rankable rows)
- Hy4 preview public-lane score: Coming soon

| Benchmark | GPT-5.6 Terra | Hy4 preview | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath (legacy) | 84.9% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 84.900% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 68.300% | Coming soon | Coming soon |
| Apex | Coming soon | 74.2% | Coming soon |

## FAQ

### Which is better overall, GPT-5.6 Terra or Hy4 preview?

GPT-5.6 Terra has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

### Where is the biggest gap between GPT-5.6 Terra and Hy4 preview?

The widest category gap is in knowledge, where the averages are 69.6 for GPT-5.6 Terra and 63.6 for Hy4 preview.

### How many benchmarks does GPT-5.6 Terra cover on BenchLM?

GPT-5.6 Terra currently has 34 sourced benchmark scores on BenchLM.

### How many benchmarks does Hy4 preview cover on BenchLM?

Hy4 preview currently has 30 sourced benchmark scores on BenchLM.

## Related Comparisons

- [GPT-5.6 Terra vs GPT-5.6 Sol](/compare/gpt-5-6-sol-vs-gpt-5-6-terra)
- [Hy4 preview vs GPT-5.6 Sol](/compare/gpt-5-6-sol-vs-hy4-preview)
- [GPT-5.6 Terra vs GPT-5.6 Luna](/compare/gpt-5-6-luna-vs-gpt-5-6-terra)
- [Hy4 preview vs GPT-5.6 Luna](/compare/gpt-5-6-luna-vs-hy4-preview)

## Explore More

- [GPT-5.6 Terra profile](/models/gpt-5-6-terra)
- [Hy4 preview profile](/models/hy4-preview)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)