GPT-5.6 Cyber vs Fugu Ultra
Fugu Ultra comes out ahead, 33 to 30 on our weighted score, and it is the cheaper option too.
OpenAIGPT-5.6 Cyber
30/100- ECI—
- Price$12.50 / $75.00
- Context400K
- Our pick
Sakana AI
Fugu Ultra
33/100- ECI—
- Price$5.00 / $30.00
- Context1M
Add a model
Make it a three-way comparison.
Fugu Ultra is our pick
Fugu Ultra is the better all-round choice, scoring 33/100 against GPT-5.6 Cyber (30). It leads on context window. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
- CapabilityNot enough dataNo independent benchmark covers every model here yet
- Lowest priceFugu UltraFugu Ultra $11.25 · GPT-5.6 Cyber $28.13 per 1M tokens (3:1 blend)
- Longest contextFugu UltraFugu Ultra 1,000,000 · GPT-5.6 Cyber 400,000 tokens
- Widest inputsSame inputsGPT-5.6 Cyber: Text, Images · Fugu Ultra: Text, Images
- Self-hostingNo open weightsBoth are available only through APIs
| Measure | Weight | GPT-5.6 Cyber | Fugu Ultra |
|---|---|---|---|
| Price | 50% | 0 | 0 |
| Inputs & features | 30% | 70 | 70 |
| Context window | 20% | 44 | 60 |
| Overall | 100% | 30/100 | 33/100 |
Left out because at least one model lacks the data: capability. The remaining weights were rescaled.
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | GPT-5.6 CyberOpenAI | Fugu UltraSakana AI |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | — | — |
| ECI rank | — | — |
| Price per million tokens | ||
| Input | $12.50 | $5.00 (best) |
| Output | $75.00 | $30.00 (best) |
| Cached input | $1.25 | $0.50 (best) |
| Blended (3:1) | $28.13 | $11.25 (best) |
| Long-context rate | Same rate | Over 272K: $10.00 / $45.00 |
| Price source | Official OpenAI API | Official Sakana AI API |
| Limits | ||
| Context window | 400,000 tokens | 1,000,000 tokens (best) |
| Max output | 128,000 tokens | — |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | Yes | Yes |
| PDFs | No | No |
| Audio | No | No |
| Video | No | No |
| Reasoning | Yeslow · medium · high · xhigh · max | Yeshigh · xhigh |
| Tool calling | Yes | Yes |
| Structured output | Yes | Yes |
| Availability | ||
| Weights | Proprietary | Proprietary |
| API model ID | gpt-daybreak-red-latest | fugu-ultra |
| API providers | 1 | 11 (best) |
| Released | Aug 7, 2026 | Jun 15, 2026 |
| Knowledge cutoff | Feb 16, 2026 | — |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- GPT-5.6 Cyber$275.00
- Fugu Ultra$110.00
Which should you choose?
Which is better: GPT-5.6 Cyber or Fugu Ultra?
Fugu Ultra is the better all-round choice, scoring 33/100 against GPT-5.6 Cyber (30). It leads on context window. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
Which is cheaper, GPT-5.6 Cyber or Fugu Ultra?
Fugu Ultra is cheaper at $5.00 input / $30.00 output per million tokens (official Sakana AI API price). GPT-5.6 Cyber costs $12.50 input / $75.00 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $11.25 per million tokens for Fugu Ultra versus $28.13 for GPT-5.6 Cyber (2.5× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. GPT-5.6 Cyber has not been scored yet and Fugu Ultra has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for GPT-5.6 Cyber and Fugu Ultra yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. Both support tool calling for agent workflows.
Which has the bigger context window?
Fugu Ultra has the largest context window at 1,000,000 tokens, against 400,000 for GPT-5.6 Cyber. Maximum output per response: GPT-5.6 Cyber up to 128,000 tokens.
Which can read images, PDFs, audio or video?
GPT-5.6 Cyber accepts text and images; Fugu Ultra accepts text and images. They handle the same number of input types.
Are any of these open source?
No. GPT-5.6 Cyber and Fugu Ultra are proprietary and only available through APIs and apps.
Which is newer?
GPT-5.6 Cyber is the newest, released Aug 7, 2026. Fugu Ultra came out Jun 15, 2026. Knowledge cutoff: GPT-5.6 Cyber Feb 16, 2026.
How do you decide the winner?
Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Oct 4, 2026.
