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Merge Gateway

Fugu Ultra API

Merge Gateway
About

Build advanced reasoning agents with Fugu Ultra, 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 via the Merge Gateway API with up to 250K output tokens.

Capabilities

Input Modalities

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Output Modalities

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Reasoning
Yes
Structured Output
No
Tool Use
Yes
WeightsClosed
Temperature
Fixed
Attachment
Supported
Limits
Context Window
1.0M

Tokens

Input Limit
1.0M

Tokens

Max Output
250K

Tokens

Pricing

Standard (per 1M tokens)

Input
$5.00
Output
$30.00

Caching (per 1M tokens)

Read
$0.50
Frequently Asked Questions

Fugu Ultra by Merge Gateway 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
Provider
Merge Gateway
Family
fugu
Release Date
Jun 15, 2026
Knowledge Cutoff
N/A
API Integration
NPM Package
merge-gateway-ai-sdk-provider
Environment Variables
MERGE_GATEWAY_API_KEY
API Base URL
https://api-gateway.merge.dev/v1/ai-sdk
Documentation