# Grok 4.5 vs Ultramarine 1 Flash

> Side-by-side benchmark comparison for Grok 4.5 and Ultramarine 1 Flash across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/grok-4-5-vs-ultramarine-1-flash
- Last updated: October 15, 2026

- Shared sourced benchmarks: 2
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Evidence is too thin for a benchmark verdict: Grok 4.5 and Ultramarine 1 Flash share only 2 sourced benchmark rows.

## Summary

- Only 2 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.
- Grok 4.5 has the larger published context window at 500K.

## Model Snapshot

| Property | Grok 4.5 | Ultramarine 1 Flash |
|----------|----------|----------|
| Creator | xAI | Paper Instruments |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 500K | Not disclosed |
| Independent public score (not head-to-head) | 63.23 | null |
| Benchmarks Covered | 19 | 5 |
| Pricing (input/output) | $2.00 / $6.00 | $0.15 / $0.50 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Grok 4.5 public-lane score: 58.9 (Supported · #31/126)
- Ultramarine 1 Flash public-lane score: Coming soon

| Benchmark | Grok 4.5 | Ultramarine 1 Flash | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | 15.7% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 83.3% | 83.2% | Grok 4.5 |
| deepSwe | 53% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 67.8% | Coming soon | Coming soon |
| JobBench | Coming soon | 62.9% | Coming soon |
| AutomationBench | Coming soon | 50.2% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Grok 4.5 public-lane score: 55.7 (Supported · #29/149)
- Ultramarine 1 Flash public-lane score: Coming soon

| Benchmark | Grok 4.5 | Ultramarine 1 Flash | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Pro | 64.7% | Coming soon | Coming soon |
| SWE Multilingual | 78% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 83.3% | 83.2% | Grok 4.5 |
| CursorBench 3.2 | 66.7% | Coming soon | Coming soon |
| VulcanBench v3 | 89.9% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 87.4% | Coming soon | Coming soon |
| SWE-bench (Vals) | 86.6% | Coming soon | Coming soon |
| PostTrainBench v1.1 | 23.4% | Coming soon | Coming soon |
| DeepSWE | Coming soon | 61.5% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Grok 4.5 public-lane score: 54.1 (#29/29)
- Ultramarine 1 Flash public-lane score: Coming soon

| Benchmark | Grok 4.5 | Ultramarine 1 Flash | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 52.6% | Coming soon | Coming soon |
| ARC-AGI-3 | 0.3% | Coming soon | Coming soon |
| ARC-AGI-1 | 85.67% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Grok 4.5 public-lane score: 82.9 (Unranked · 1 rankable row)
- Ultramarine 1 Flash public-lane score: Coming soon

### Knowledge

- Winner: Insufficient shared evidence
- Grok 4.5 public-lane score: 67.3 (Supported · #27/182)
- Ultramarine 1 Flash public-lane score: Coming soon

| Benchmark | Grok 4.5 | Ultramarine 1 Flash | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 92.9% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 89.2% | Coming soon | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Grok 4.5 public-lane score: 62.9 (Unranked · 2 rankable rows)
- Ultramarine 1 Flash public-lane score: Coming soon

| Benchmark | Grok 4.5 | Ultramarine 1 Flash | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 57.193% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 24.390% | Coming soon | Coming soon |

## FAQ

### Is there enough evidence to pick between Grok 4.5 and Ultramarine 1 Flash?

Not yet. The models share only 2 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

- [Grok 4.5 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-grok-4-5)
- [Ultramarine 1 Flash vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-ultramarine-1-flash)
- [Grok 4.5 vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-grok-4-5)
- [Ultramarine 1 Flash vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-ultramarine-1-flash)

## Explore More

- [Grok 4.5 profile](/models/grok-4-5)
- [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)