Model comparison
Grok 4 Fast (Reasoning) vs Sakana Fugu-Ultra
Head-to-head evidence from 0 shared benchmark results across 0 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Grok 4 Fast (Reasoning) #76 (Supported); Sakana Fugu-Ultra unranked (Not scored). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Grok 4 Fast (Reasoning) and Sakana Fugu-Ultra share 0 comparable benchmark results. 0 of 8 categories are comparable. 13 results are unique to Grok 4 Fast (Reasoning); 11 to Sakana Fugu-Ultra.
Updated July 23, 2026- Shared results
- 0
- Grok 4 Fast (Reasoning) only
- 13
- Sakana Fugu-Ultra only
- 11
- Comparable categories
- 0 / 8
Benchmark data for Grok 4 Fast (Reasoning) and Sakana Fugu-Ultra is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 0 shared benchmark results across 0 evidence categories; 0 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
BenchLM has partial data for these models, but not enough overlapping benchmark coverage to produce a fair score-level comparison yet.
Grok 4 Fast (Reasoning) has the larger context window at 2M, compared with 1M for Sakana Fugu-Ultra.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Grok 4 Fast (Reasoning) | Sakana Fugu-Ultra | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Grok 4 Fast (Reasoning)Not available | Sakana Fugu-UltraNot available | A complete price comparison is not available. |
| Generation speedtokens per second | Grok 4 Fast (Reasoning)Not available | Sakana Fugu-UltraNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Grok 4 Fast (Reasoning)Not available | Sakana Fugu-UltraNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Grok 4 Fast (Reasoning)2M | Sakana Fugu-Ultra1M | Grok 4 Fast (Reasoning) lists the larger context window. |
Benchmark Deep Dive
Agentic2 benchmarks
Coding7 benchmarks
| Benchmark | Grok 4 Fast (Reasoning) | Sakana Fugu-Ultra | Result |
|---|---|---|---|
| Vibe Code BenchSource | 0.00% | — | Not comparable |
| AA-SciCodeSource | 44.2% | — | Not comparable |
| SWE-bench ProSource | — | 73.7% | Not comparable |
| Terminal-Bench 2.0Source | — | 82.1% | Not comparable |
| LiveCodeBench v6Source | — | 93.2% | Not comparable |
| LiveCodeBench ProSource | — | 90.8% | Not comparable |
| SciCodeSource | — | 58.7% | Not comparable |
Reasoning3 benchmarks
Knowledge9 benchmarks
| Benchmark | Grok 4 Fast (Reasoning) | Sakana Fugu-Ultra | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 27.4% | — | Not comparable |
| AA-GPQA DiamondSource | 84.7% | — | Not comparable |
| AA-HLESource | 17.0% | — | Not comparable |
| AA-Omniscience IndexSource | -28.4% | — | Not comparable |
| AA-Omniscience AccuracySource | 22.6% | — | Not comparable |
| AA-Omniscience Hallucination RateSource | 66.0% | — | Not comparable |
| GPQASource | — | 95.5% | Not comparable |
| GPQA-DSource | — | 95.5% | Not comparable |
| HLE w/o toolsSource | — | 50% | Not comparable |
Multimodal2 benchmarks
Inst. Following1 benchmarks
| Benchmark | Grok 4 Fast (Reasoning) | Sakana Fugu-Ultra | Result |
|---|---|---|---|
| AA-IFBenchSource | 50.5% | — | Not comparable |
Frequently Asked Questions (3)
Can I compare Grok 4 Fast (Reasoning) and Sakana Fugu-Ultra on BenchLM yet?
Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.
Why does this comparison show “coming soon”?
BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.
What data is available for Grok 4 Fast (Reasoning) and Sakana Fugu-Ultra today?
Sakana Fugu-Ultra: Pricing unavailable Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.
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