DeepSeek V4.1 Flash vs Fugu Ultra v2
Detailed technical comparison between DeepSeek V4.1 Flash (DeepSeek) and Fugu Ultra v2 (Sakana AI). Review live API token pricing, context window capabilities, time-to-first-token latency, and verified benchmark scores side-by-side.
Comparison Snapshot
DeepSeek V4.1 Flash
1,048,576 tokensTie
Equal CapabilityTie
Equal SpeedDeepSeek V4.1 Flash
$0.15 / MTokDeepSeek V4.1 Flash
DeepSeek V4.1 Flash is an advanced artificial intelligence model engineered by DeepSeek. Tailored for complex multi-step reasoning, programming synthesis, and extended document comprehension, DeepSeek V4.1 Flash represents a key architectural iteration in the DeepSeek model family. First released in 2026-09-10, it serves enterprise developers, research teams, and autonomous system architects requiring strict instruction compliance. Featuring an input capacity of 1,048,576 tokens (approximately 1,398 words), DeepSeek V4.1 Flash processes multi-file code repositories, lengthy technical reports, and complex prompts in a single inference call.
Fugu Ultra v2
Fugu Ultra v2 is an advanced artificial intelligence model engineered by Sakana AI. Tailored for complex multi-step reasoning, programming synthesis, and extended document comprehension, Fugu Ultra v2 represents a key architectural iteration in the Sakana AI model family. First released in 2026-09-11, it serves enterprise developers, research teams, and autonomous system architects requiring strict instruction compliance. Featuring an input capacity of 1,000,000 tokens (approximately 1,333 words), Fugu Ultra v2 processes multi-file code repositories, lengthy technical reports, and complex prompts in a single inference call.
Technical Specifications
🏆 = Superior Spec| Specification | DeepSeek V4.1 Flash | Fugu Ultra v2 |
|---|---|---|
| Provider | DeepSeek | Sakana AI |
| Context Window | 1,048,576 tokens🏆 | 1,000,000 tokens |
| Agent Suitability | Not yet benchmarked | Not yet benchmarked |
| Time to First Token (TTFT) | No public TTFT data | No public TTFT data |
| Deployment Model | self hostable | managed api |
| Production Stability | Beta Access (est.) | Beta Access (est.) |
| API Available | Yes | Yes |
| Released Date | 2026-09-10 | 2026-09-11 |
API Pricing Comparison
Input Price per Million Tokens
DeepSeek V4.1 Flash
$0.15
Fugu Ultra v2
$5.00
Output Price per Million Tokens
DeepSeek V4.1 Flash
$0.60
Fugu Ultra v2
$30.00
💡 Cost Ratio: DeepSeek V4.1 Flash is 33.3x cheaper per input token than Fugu Ultra v2.
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Run side-by-side prompt benchmarks in our dynamic multi-model Sandbox. Compare execution speeds, latency metrics, and compute actual costs in real-time.
Benchmark Performance Metrics
Standardized Scores (0–100%)Scores show verified raw accuracy percentages across standardized AI evaluation suites. Higher bars indicate superior performance in that domain.
DeepSeek V4.1 Flash Quirks & Gotchas
No developer gotchas reported.
Fugu Ultra v2 Quirks & Gotchas
No developer gotchas reported.
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