Identity
- Status
- active
- Developer ID
allenai/MolmoWeb-4B- Released
- Mar 20, 2026
- Version
- MolmoWeb 4B
- License
- apache-2.0
Ai2MolmoWeb 4B
MolmoWeb 4B is Ai2's fully open multimodal web agent for visual browsing and grounded computer interaction.
- Token context
- 10,240 tokens
- Inputs
- Text, Image
- Outputs
- Text
- Released
- Mar 20, 2026
Providers & Pricing
0 current sourced offerings
No Current Hosted API Offering VerifiedThis record is a downloadable or self-hosted artifact. Its cost depends on the infrastructure and serving configuration, not a universal model price.
At a Glance
Model Facts
Capacity
- Token context
- 10,240 tokens
- Maximum output
- Unknown
- Total parameters
- 4,850,869,200
- Active parameters
- Unknown
- Knowledge cutoff
- Not reported
Interface and Access
- Inputs
- Text, Image
- Outputs
- Text
- API available
- No
- Open weights
- Yes
- Self-hostable
- Yes
- Reasoning
- No
- Vision
- Yes
- Tool calling
- Yes
- Capabilities
- chat, computer-use, generation, tools, vision
This page represents one developer model product. Dated API snapshots, serving endpoints, pricing, regions, quantizations, and service tiers attach as versioned aliases or provider details and never create duplicate public model records.
Version Lineage
PredecessorUnknown
SuccessorsUnknown
Aliasesallenai/MolmoWeb-4B, MolmoWeb 4B
Explicit Unknowns
- Maximum output
- Tokenizer
- Knowledge cutoff
Primary Evidence
Sources and Observation Date
Comparable Peers
Related Model Comparisons
| A | Pair | B | Context |
|---|---|---|---|
MolmoWeb 4BAi2 | vs | MolmoWeb 8BAi2 | family variantsimage, text |
MolmoWeb 4BAi2 | vs | cross-developer peersimage, text | |
MolmoWeb 4BAi2 | vs |  Ministral-3-3B-Reasoning-2512Mistral AI | cross-developer peersimage, text |
MolmoWeb 4BAi2 | vs |  GLM-OCRZ.ai | cross-developer peersimage, text |
MolmoWeb 4BAi2 | vs | Ministral-3-8B-Instruct-2512Mistral AI | cross-developer peersimage, text |
MolmoWeb 4BAi2 | vs | Mistral Large 3Mistral AI | cross-developer peersimage, text |
MolmoWeb 4BAi2 | vs |  phi-4Microsoft | cross-developer peerstext |
MolmoWeb 4BAi2 | vs |  PII-TracerPerplexity | cross-developer peerstext |
MolmoWeb 4BAi2 | vs |  stable-diffusion-3.5-largeStability AI | cross-developer peersimage |
MolmoWeb 4BAi2 | vs | stable-diffusion-3.5-mediumStability AI | cross-developer peersimage |
MolmoWeb 4BAi2 | vs |  FLUX.2-klein-4b-fp8Black Forest Labs | cross-developer peersimage |
MolmoWeb 4BAi2 | vs | FLUX.2-klein-base-4b-fp8Black Forest Labs | cross-developer peersimage |
Questions
MolmoWeb 4B FAQs
What is MolmoWeb 4B?+
MolmoWeb 4B is Ai2's fully open multimodal web agent for visual browsing and grounded computer interaction. It is developed by Ai2 and its current sourced lifecycle status is active.
What inputs and outputs does MolmoWeb 4B support?+
MolmoWeb 4B's current record lists Text and Image as input and Text as output.
How much context does MolmoWeb 4B support?+
The current record lists a 10,240-token context window and does not report a maximum output length.
Is MolmoWeb 4B available through an API?+
MolmoWeb 4B is explicitly marked as not API-available in the current record.
How large is MolmoWeb 4B?+
The current record lists 4,850,869,200 total parameters and an unknown active parameter count. Its architecture is Molmo2ForConditionalGeneration.
What capabilities and tasks does MolmoWeb 4B support?+
MolmoWeb 4B's recorded capabilities are chat, computer-use, generation, tools, and vision. Its supported tasks are image and text.
How much does MolmoWeb 4B cost through an API?+
MolmoWeb 4B has no verified hosted API offering, so no provider token price applies. It is a downloadable or self-hosted artifact whose cost depends on the serving infrastructure and workload.
Can MolmoWeb 4B be self-hosted?+
MolmoWeb 4B is an open-weight model. Self-hosting is supported, and the recorded license is apache-2.0.
Does MolmoWeb 4B have related versions or aliases?+
No predecessor is recorded. No successor is recorded. Recorded aliases are allenai/MolmoWeb-4B and MolmoWeb 4B.
Which models can MolmoWeb 4B be compared with?+
The current compatible peer set includes MolmoWeb 8B, granite-vision-4.1-4b, Ministral-3-3B-Reasoning-2512, GLM-OCR, and Ministral-3-8B-Instruct-2512. Compatibility requires shared sourced modalities and tasks; it does not imply that one model is better. Browse model comparisons →