# Particle-1 vs Ultramarine 1 Flash

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

- Canonical page: https://benchlm.ai/compare/particle-1-vs-ultramarine-1-flash
- Last updated: October 29, 2026

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

## Quick Verdict

Evidence is too thin for a benchmark verdict: Particle-1 and Ultramarine 1 Flash 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.
- Ultramarine 1 Flash has the lower published output-token price.
- Particle-1 has the larger published context window at 1M.

## Model Snapshot

| Property | Particle-1 | Ultramarine 1 Flash |
|----------|----------|----------|
| Creator | Particle AI | Paper Instruments |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | Not disclosed |
| Independent public score (not head-to-head) | null | null |
| Benchmarks Covered | 5 | 5 |
| Pricing (input/output) | $0.25 / $1.00 | $0.15 / $0.50 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Particle-1 public-lane score: Coming soon
- Ultramarine 1 Flash public-lane score: Coming soon

| Benchmark | Particle-1 | Ultramarine 1 Flash | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 79.9% | 83.2% | Ultramarine 1 Flash |
| JobBench | Coming soon | 62.9% | Coming soon |
| AutomationBench | Coming soon | 50.2% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Particle-1 public-lane score: Coming soon
- Ultramarine 1 Flash public-lane score: Coming soon

| Benchmark | Particle-1 | Ultramarine 1 Flash | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 79.9% | 83.2% | Ultramarine 1 Flash |
| DeepSWE | 72.6% | 61.5% | Particle-1 |

### Knowledge

- Winner: Insufficient shared evidence
- Particle-1 public-lane score: Coming soon
- Ultramarine 1 Flash public-lane score: Coming soon

| Benchmark | Particle-1 | Ultramarine 1 Flash | Winner |
|-----------|-----------|-----------|--------|
| GPQA-D | 90.4% | Coming soon | Coming soon |
| MMLU | 86.1% | Coming soon | Coming soon |

## FAQ

### Is there enough evidence to pick between Particle-1 and Ultramarine 1 Flash?

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

- [Particle-1 vs Gemini 4 Carbon](/compare/gemini-4-carbon-vs-particle-1)
- [Ultramarine 1 Flash vs Gemini 4 Carbon](/compare/gemini-4-carbon-vs-ultramarine-1-flash)
- [Particle-1 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-particle-1)
- [Ultramarine 1 Flash vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-ultramarine-1-flash)

## Explore More

- [Particle-1 profile](/models/particle-1)
- [Ultramarine 1 Flash profile](/models/ultramarine-1-flash)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)