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Allen Institute for AI (Ai2) / FAMILY RECORD

Molmo 2: license, size and what is open.

A family of open vision-language models for images, multiple images, and video, with explicit spatial outputs such as pointing and object tracking.

License

Commercial use permitted under Apache-2.0; review accompanying terms.

Apache-2.0 repository and model terms; some source datasets require separate agreements ↗

Sizes and download

4B, 7B, and 8B variants

Molmo2-4B
Total: 4B. Active: Not separately established. Source ↗
Molmo2-O-7B
Total: 7B. Active: Not separately established. Source ↗
Molmo2-8B
Total: 8B. Active: 8B. Source ↗

About 19.40 GB of selected documented weights · File listing ↗

Selected artifact: allenai/Molmo2-4B. Format: Safetensors, float32. File evidence checked 2026-10-11. Selected artifact license: apache-2.0 ↗

Molmo2-4B only, not 8B or O-7B. Four float32 shards include vision components, so 4B label is not whole tensor parameter count. Selected weight files only; supporting files and runtime memory are separate. Not a smallest-download census or proof of hardware compatibility.

Can my computer run it?

Compatibility, runtime memory and speed are untested by Bright.

Choose your computer and inspect documented candidates →

Nine things to check

Source check: . Downloads, when known, carry their own check date.

Ask about an image →

Checked release: Molmo2-4B, Molmo2-8B, and Molmo2-O-7B
Sources checked 2026-09-19

Molmo 2 release (month documented; day not established)
· Primary source

Ai2’s primary media record establishes December 2025, not a release day; this field remains null rather than inventing one.

The profile describes this checkpoint, not every release carrying the family name. Developer documentation is not independent reproduction.

THE MODEL / THE TERMS

Know what you are picking up.

Parameters
4B, 7B, and 8B variants
Architecture
Vision-language models with variants specialized for visual understanding and spatial grounding.
Modalities
text · image · video · pointing coordinates · tracking coordinates
Context
Varies by checkpoint and training stage; use the versioned model card.
Weights license
Apache-2.0 repository and model terms; some source datasets require separate agreements
Commercial use
The released code and model artifacts use Apache-2.0, but dataset terms must be reviewed separately.
Memory
Requirements vary from the 4B to 8B variants and with video length; no single minimum is asserted.
Known quantizations
No canonical quantized checkpoint is asserted in this record

Specifications are developer-reported. Primary release documentation ↗ · All sources and terms

NINE DIMENSIONS / NO OPENNESS SCORE

What is actually available?

Each component has its own evidence. “Not established” means this source review did not verify availability; it is not a claim that nothing exists.

available

Weights

Multiple official checkpoints are released after pre-training, supervised fine-tuning, and long-context fine-tuning.

Inspect this claim’s source ↗

WHY THIS RELEASE MATTERS

What to explore.

  • Video understanding
  • Multi-image reasoning
  • Pointing
  • Object tracking
  • Open training scripts

WHAT THE RECORD DOES NOT ESTABLISH

Keep the limits.

  • Some training datasets need separate agreements
  • Spatial outputs still require task-specific evaluation before deployment

This record does not attach an independent reproduction of Molmo 2 results; it highlights that the released artifacts support such work.

Explore the memory tradeoffs↗

FOLLOW THE RECORD

Sources, not superlatives.

  1. Ai2 media center — Molmo 2 release month ↗ (institution)
  2. Molmo 2 repository ↗ (repository)
  3. Molmo 2 model and training documentation ↗ (report)

Source check: 2026-09-19. AI-assisted editorial review, with no named external expert or independent hardware validation claimed. Licenses and model cards can change. Review the linked terms for the specific artifact and intended use.

Understand open source vs open weights ↗