# Grok 4.20 vs Sakana Fugu-Ultra

> Side-by-side benchmark comparison for Grok 4.20 and Sakana Fugu-Ultra across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/grok-4-20-beta-vs-sakana-fugu-ultra
- Last updated: September 28, 2026

- Shared sourced benchmarks: 5
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Pick Sakana Fugu-Ultra if you want the stronger benchmark profile. Grok 4.20 only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Sakana Fugu-Ultra leads overall 74 to 59.76.
- The clearest category separation is in reasoning, where the averages are 41.1 for Grok 4.20 and 79.1 for Sakana Fugu-Ultra.
- The biggest single benchmark swing is CharXiv in Multimodal & Grounded, with scores of 60.9% and 86.6%.
- Sakana Fugu-Ultra is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Grok 4.20 also has the larger context window at 2M.

## Model Snapshot

| Property | Grok 4.20 | Sakana Fugu-Ultra |
|----------|----------|----------|
| Creator | xAI | Sakana AI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 2M | 1M |
| Overall Score | 59.76 | null |
| Benchmarks Covered | 23 | 11 |
| Pricing (input/output) | $1.25 / $2.50 | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Agentic

- Winner: Not comparable
- Grok 4.20 public-lane score: 23.3 (Supported · #95/117)
- Sakana Fugu-Ultra public-lane score: Coming soon

| Benchmark | Grok 4.20 | Sakana Fugu-Ultra | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 47.1% | Coming soon | Coming soon |
| DeepSearchQA | 62.8% | Coming soon | Coming soon |
| Gert Labs | 38.36% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 44.2% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 82.1% | Coming soon |

### Coding

- Winner: Not comparable
- Grok 4.20 public-lane score: 22.4 (Supported · #115/142)
- Sakana Fugu-Ultra public-lane score: Coming soon

| Benchmark | Grok 4.20 | Sakana Fugu-Ultra | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench Pro | 74.2% | 90.8% | Sakana Fugu-Ultra |
| SWE-bench Verified | 76.7% | Coming soon | Coming soon |
| SWE-bench Pro | 51.8% | 73.7% | Sakana Fugu-Ultra |
| Vibe Code Bench | 4.06% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 84.3% | Coming soon | Coming soon |
| SWE-bench (Vals) | 72.2% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 82.1% | Coming soon |
| LiveCodeBench v6 | Coming soon | 93.2% | Coming soon |
| SciCode | Coming soon | 58.7% | Coming soon |

### Reasoning

- Winner: Not comparable
- Grok 4.20 public-lane score: 41.1 (Unranked · 2 rankable rows)
- Sakana Fugu-Ultra public-lane score: 79.1 (Unranked · 1 rankable row)

| Benchmark | Grok 4.20 | Sakana Fugu-Ultra | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 53.3% | Coming soon | Coming soon |
| ARC-AGI-3 | 0.1% | Coming soon | Coming soon |
| MRCRv2 | Coming soon | 93.6% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Grok 4.20 public-lane score: 35.6 (#45/50)
- Sakana Fugu-Ultra public-lane score: 73.6 (Unranked · 1 rankable row)

| Benchmark | Grok 4.20 | Sakana Fugu-Ultra | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 75.2% | Coming soon | Coming soon |
| CharXiv | 60.9% | 86.6% | Sakana Fugu-Ultra |
| ERQA | 54.1% | Coming soon | Coming soon |
| SimpleVQA | 57.4% | Coming soon | Coming soon |
| MedXpertQA (MM) | 65.8% | Coming soon | Coming soon |

### Knowledge

- Winner: Not comparable
- Grok 4.20 public-lane score: 49.3 (Supported · #62/168)
- Sakana Fugu-Ultra public-lane score: Coming soon

| Benchmark | Grok 4.20 | Sakana Fugu-Ultra | Winner |
|-----------|-----------|-----------|--------|
| GPQA-D | 88.5% | 95.5% | Sakana Fugu-Ultra |
| HLE w/o tools | 31.6% | 50% | Sakana Fugu-Ultra |
| HealthBench Hard | 20.3% | Coming soon | Coming soon |
| MedXpertQA (Text) | 50.2% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 88.6% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 86.3% | Coming soon | Coming soon |
| GPQA | Coming soon | 95.5% | Coming soon |

## FAQ

### Which is better overall, Grok 4.20 or Sakana Fugu-Ultra?

Sakana Fugu-Ultra is ahead overall on BenchLM right now.

### Where is the biggest gap between Grok 4.20 and Sakana Fugu-Ultra?

The widest category gap is in reasoning, where the averages are 41.1 for Grok 4.20 and 79.1 for Sakana Fugu-Ultra.

### How many benchmarks does Grok 4.20 cover on BenchLM?

Grok 4.20 currently has 23 sourced benchmark scores on BenchLM.

### How many benchmarks does Sakana Fugu-Ultra cover on BenchLM?

Sakana Fugu-Ultra currently has 11 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Grok 4.20 vs Grok 4.20 Multi-agent](/compare/grok-4-20-beta-vs-grok-4-20-multi-agent-beta)
- [Sakana Fugu-Ultra vs Grok 4.20 Multi-agent](/compare/grok-4-20-multi-agent-beta-vs-sakana-fugu-ultra)
- [Grok 4.20 vs Sakana Fugu](/compare/grok-4-20-beta-vs-sakana-fugu)
- [Sakana Fugu-Ultra vs Sakana Fugu](/compare/sakana-fugu-vs-sakana-fugu-ultra)

## Explore More

- [Grok 4.20 profile](/models/grok-4-20-beta)
- [Sakana Fugu-Ultra profile](/models/sakana-fugu-ultra)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)