Fugu Ultra v2 API
About
Build advanced reasoning agents with Fugu Ultra v2, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $5.00/1M input and $30.00/1M output tokens, native tool calling support. Access Fugu Ultra v2 via the OpenRouter API with up to 128K output tokens.
Capabilities
Input Modalities
textimagepdf
Output Modalities
text
Reasoning
Yes
Structured Output
Yes
Tool Use
Yes
WeightsClosed
Temperature
Fixed
Attachment
Supported
Limits
Context Window
1.0M
Tokens
Input Limit
1.0M
Tokens
Max Output
128K
Tokens
Pricing
Standard (per 1M tokens)
Input
$5.00
Output
$30.00
Caching (per 1M tokens)
Read
$0.50
Frequently Asked Questions
Fugu Ultra v2 by OpenRouter costs $5.00 per 1M input tokens and $30.00 per 1M output tokens. Cached reads cost $0.50 per 1M tokens.
Model Details
ID
sakana/fugu-ultra-v2
Provider
OpenRouterFamily
fugu
Release Date
Sep 11, 2026
Knowledge Cutoff
Aug 28, 2026
API Integration
NPM Package
@openrouter/ai-sdk-provider
Environment Variables
OPENROUTER_API_KEY
API Base URL
https://openrouter.ai/api/v1