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Fern

Mirendil's long-context model for agentic coding and AI research work

CuratedCoding Models

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What it does

Fern is Mirendil's first model, pretrained from scratch with a context window of up to 10M tokens, enough to hold a large codebase, long logs or full agent traces at once. Fern 0.1 is the Mirendil-Base model after a short round of post-training, built for high-volume agentic work: coding across large repos, research code, debugging training runs from logs and auditing training data. Access is by early-access request.

Versions

Every Fern version and when it came out. Each dot is a release.

VersionPreviewLatest version

Version	Released	After previous	Status	Comes as	Source
Fern 0.1	26 Oct 2026	First	Preview	0.1–0.5T params	mirendil.com

Dates from Mirendil's own announcements; each row links to its source.

Alternatives on the map

All 107 alternatives

Foundation Models, starting with the other Coding Models.

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