Go EuropeAIdirectory

Evidence-backed European AI register

JetBrains

Reviewed identity, roles, model listings, pricing and evidence for JetBrains.

Dataset compiled 2026-08-28 · evidence over inference

HQ Europe: Unreviewedmodel lab4 model listings0 token-price rows

Reviewed identity

Headquarters scope
headquarters unknown
Headquarters country
unknown
Headquarters city
unknown
Legal entity
JetBrains s.r.o. (Czech Republic), with JetBrains N.V. (Netherlands) as holding entity
Ownership
privately held (founder-owned)
Founded
2000
Confidence
high
Last verified
2026-08-22

Links

Official website

Headquarters evidence

Open interactive profile

Headquarters evidence

JetBrains, a Prague-based software company

Official JetBrains blog identifies the company as Prague-based.

Evidence boundaries

Organisation listings identify a reviewed canonical record. Headquarters is independent of incorporation, registered offices, ownership, hosting and runtime. Model listings show an association in the source register; they do not by themselves establish model creation, current API availability, hosting location or infrastructure ownership.

Model listings

  1. Mellum-4b-basecatalogued with this organisation · origin not asserted
    Type
    code
    Parameters
    4B
    Context
    8,192 tokens
    Languages
    multiple programming languages
    Licence
    Apache-2.0
    Release
    2025-04
  2. Mellum-4b-sft-all / language-specific SFT variantscatalogued with this organisation · origin not asserted
    Type
    code
    Parameters
    4B
    Context
    8,192 tokens
    Languages
    Python, Java, Kotlin and others
    Licence
    Apache-2.0
    Release
    2025
  3. Mellum-4b-base-ggufcatalogued with this organisation · origin not asserted
    Type
    code
    Parameters
    4B
    Context
    8,192 tokens
    Languages
    code
    Licence
    Apache-2.0
    Release
    2025
  4. Mellum 2catalogued with this organisation · origin not asserted
    Type
    code
    Parameters
    unknown
    Context
    unknown
    Languages
    code
    Licence
    open source (per JetBrains announcement)
    Release
    2026

Profile note

The most under-appreciated European code model: a profitable, bootstrapped Czech/Dutch company gave away a 4B Apache-2.0 code-completion model that most IDE vendors keep closed. 'Focal model' framing — deliberately excellent at exactly one task rather than generalist — is a distinctly European efficiency-first position and makes it the practical choice for on-prem code completion.

Record sources

  1. https://blog.jetbrains.com/ai/2025/04/mellum-goes-open-source-a-purpose-built-llm-for-developers-now-on-huggi…
  2. https://huggingface.co/JetBrains/Mellum-4b-base
  3. https://thenewstack.io/jetbrains-mellum2-open-source-coding-model/
  4. https://www.jetbrains.com/