---
type: Glossary Term
title: Fennec (Codename)
description: "The internal codename for Anthropic's Claude Sonnet 5 model, following the tradition of using animal names for model development. The fennec fox is known for it"
resource: "https://www.contextstudios.ai/glossary/fennec-codename"
category: tech
language: en
timestamp: "2026-02-19T12:36:39.594Z"
---

# Fennec (Codename)

The internal codename for Anthropic's Claude Sonnet 5 model, following the tradition of using animal names for model development. The fennec fox is known for its agility and sharp senses.

## Business Value

Leverages fennec (codename) technology to deliver 2-5x performance improvements in AI application throughput and accuracy.

## Context Studios Perspective

We stay at the cutting edge of fennec (codename) to give our clients first-mover advantage with the latest AI capabilities.