# GPT-5.6 Terra vs Particle-1

> Side-by-side benchmark comparison for GPT-5.6 Terra and Particle-1 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-6-terra-vs-particle-1
- Last updated: October 29, 2026

- Shared sourced benchmarks: 4
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Pick GPT-5.6 Terra if you want the stronger benchmark profile. Particle-1 only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- GPT-5.6 Terra leads overall 69.81 to 0.
- The biggest single benchmark swing is Terminal-Bench 2.1 in Agentic, with scores of 87.4% and 79.9%.
- Particle-1 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 | Particle-1 |
|----------|----------|----------|
| Creator | OpenAI | Particle AI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1.05M | 1M |
| Overall Score | 69.81 | null |
| Benchmarks Covered | 37 | 5 |
| Pricing (input/output) | $2.00 / $12.00 | $0.25 / $1.00 |

## Category Breakdown

### Agentic

- Winner: Not comparable
- GPT-5.6 Terra public-lane score: 60.9 (Supported · #27/135)
- Particle-1 public-lane score: Coming soon

| Benchmark | GPT-5.6 Terra | Particle-1 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | 20.8% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 87.4% | 79.9% | GPT-5.6 Terra |
| BrowseComp | 87.5% | Coming soon | Coming soon |
| OSWorld 2.0 | 50.2% | Coming soon | Coming soon |
| CyberGym | 81.8% | Coming soon | Coming soon |
| ExploitGym | 23.2% | Coming soon | Coming soon |
| Toolathlon | 53.1% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 77.5% | Coming soon | Coming soon |
| ApprenticeBench | 16% | Coming soon | Coming soon |
| MazeBench | 6% | Coming soon | Coming soon |

### Coding

- Winner: Not comparable
- GPT-5.6 Terra public-lane score: 62 (Supported · #16/156)
- Particle-1 public-lane score: Coming soon

| Benchmark | GPT-5.6 Terra | Particle-1 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Pro | 63.4% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 87.4% | 79.9% | GPT-5.6 Terra |
| DeepSWE | 69.6% | 72.6% | Particle-1 |
| 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 |

### Reasoning

- Winner: Not comparable
- GPT-5.6 Terra public-lane score: 69.1 (#18/26)
- Particle-1 public-lane score: Coming soon

| Benchmark | GPT-5.6 Terra | Particle-1 | 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 |

### Multimodal & Grounded

- Winner: Not comparable
- GPT-5.6 Terra public-lane score: 84.7 (#14/58)
- Particle-1 public-lane score: Coming soon

| Benchmark | GPT-5.6 Terra | Particle-1 | Winner |
|-----------|-----------|-----------|--------|
| ExtractBench (LlamaIndex) | 92.26% | Coming soon | Coming soon |
| ParseBench | 67.11% | Coming soon | Coming soon |
| MMMU-Pro | 80.7% | Coming soon | Coming soon |
| MMMU-Pro w/ Python | 82% | Coming soon | Coming soon |

### Knowledge

- Winner: Not comparable
- GPT-5.6 Terra public-lane score: 69.1 (Supported · #19/179)
- Particle-1 public-lane score: Coming soon

| Benchmark | GPT-5.6 Terra | Particle-1 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 92.9% | Coming soon | Coming soon |
| GPQA-D | 92.9% | 90.4% | 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 |
| MMLU | Coming soon | 86.1% | Coming soon |

### Instruction Following

- Winner: Not comparable
- GPT-5.6 Terra public-lane score: 87.1 (#42/157)
- Particle-1 public-lane score: Coming soon

### Mathematics

- Winner: Not comparable
- GPT-5.6 Terra public-lane score: 90.1 (Unranked · 3 rankable rows)
- Particle-1 public-lane score: Coming soon

| Benchmark | GPT-5.6 Terra | Particle-1 | 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 |

## FAQ

### Which is better overall, GPT-5.6 Terra or Particle-1?

GPT-5.6 Terra is ahead overall on BenchLM right now.

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

GPT-5.6 Terra currently has 37 sourced benchmark scores on BenchLM.

### How many benchmarks does Particle-1 cover on BenchLM?

Particle-1 currently has 5 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)
- [Particle-1 vs GPT-5.6 Sol](/compare/gpt-5-6-sol-vs-particle-1)
- [GPT-5.6 Terra vs GPT-5.6 Luna](/compare/gpt-5-6-luna-vs-gpt-5-6-terra)
- [Particle-1 vs GPT-5.6 Luna](/compare/gpt-5-6-luna-vs-particle-1)

## Explore More

- [GPT-5.6 Terra profile](/models/gpt-5-6-terra)
- [Particle-1 profile](/models/particle-1)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)