SAFugu Ultra Paid vs 
GPT-5 Nano Paid
Fugu Ultra vs GPT-5 Nano compared — price per token, context window, multimodality, openness and which to choose. Full 2026 breakdown.
Fugu Ultra — full profile › · GPT-5 Nano — full profile ›
Prices & specs refreshed from live data · olud.ai
Open-model prices = cheapest provider via OpenRouter; official maker rates may be higher.
$30 /M outputManaged API (no infra to run)
$0.4 /M outputManaged API (no infra to run)
Fugu Ultra vs GPT-5 Nano specs
| Spec | Fugu Ultra | GPT-5 Nano | Winner |
|---|---|---|---|
| Maker | Sakana AI | OpenAI | – |
| Type | Proprietary | Proprietary | – |
| Context window | 1M tokens | 400K tokens | SAFugu Ultra |
| Input price | $5/M | $0.05/M | |
| Output price | $30/M | $0.4/M | |
| Vision / multimodal | Yes | Yes | = Tie |
| Tool / function calling | Yes | Yes | = Tie |
| Self-hostable | No (API only) | No (API only) | – |
| License | Proprietary | Proprietary | – |
Price gap & when to choose each
GPT-5 Nano is ~75× cheaper than Fugu Ultra on output tokens ($0.4 vs $30 per M tokens).
- You want frontier performance through a managed API
- You need the longer 1M context window
- You value reliability & ecosystem
- You don't want to manage infrastructure
- You want frontier performance through a managed API
- You want the lower output price
- You value reliability & ecosystem
- You don't want to manage infrastructure
Feature comparison
| Capability | Fugu Ultra | GPT-5 Nano |
|---|---|---|
| Open weights (downloadable) | ✗ | ✗ |
| Self-hostable | ✗ | ✗ |
| Runs fully offline | ✗ | ✗ |
| Vision / multimodal | ✓ | ✓ |
| Tool / function calling | ✓ | ✓ |
| 1M+ context window | ✓ | ✗ |
Benchmarks: Fugu Ultra vs GPT-5 Nano
Independent benchmark scores measured by Artificial Analysis. Higher is better (except latency).
Benchmark data by Artificial Analysis.
How Fugu Ultra and GPT-5 Nano score
| Criterion | Fugu Ultra | GPT-5 Nano |
|---|---|---|
| Cost-efficiency | 3.0 | 5.0 |
| Context window | 5.0 | 4.5 |
| Openness | 1.5 | 1.5 |
| Self-hosting | 1.0 | 1.0 |
| Multimodality | 5.0 | 5.0 |
Scores come from live data — output price (cost), context length, open vs closed weights (openness & self-hosting) and vision/tool support (multimodality). Raw task quality isn't scored here; it depends on your benchmark — see the verdict.
What each model is
Fugu Ultra Paid
Fugu Ultra is the higher-performance model in Sakana AI's Fugu family. Rather than a single monolithic model, Fugu is a learned multi-agent orchestration system: a language model trained to route...
GPT-5 Nano Paid
GPT-5-Nano is the smallest and fastest variant in the GPT-5 system, optimized for developer tools, rapid interactions, and ultra-low latency environments. While limited in reasoning depth compared to its larger...
Other models in these families
These variants are tracked but not compared here — one page per family keeps the comparison readable.
Frequently asked questions
Fugu Ultra vs GPT-5 Nano — which is cheaper?
GPT-5 Nano is cheaper on output ($0.4/M vs $30/M).
Which has the larger context window?
Fugu Ultra offers the larger context window (1M tokens).
Fugu Ultra vs GPT-5 Nano — which should I pick in 2026?
Choose GPT-5 Nano for the lower output price ($0.4/M vs $30/M). Choose Fugu Ultra if you need the larger 1M context window.
People also compare
Explore more open-source AI
Browse the full open-source model leaderboard, thousands of tools and live benchmarks — all in one place.
Open the leaderboard →