MolmoWeb 4B vs MolmoWeb 8B
Why this pair: Ai2's fully open visual web-agent sizes
Benchmark Performance
Available Benchmarks
Technical Differences
Side-by-Side Facts
| Field | MolmoWeb 4B | MolmoWeb 8B |
|---|---|---|
| Developer | Ai2 | Ai2 |
| Family | Molmoweb | Molmoweb |
| Model | MolmoWeb 4B | MolmoWeb 8B |
| Version | MolmoWeb 4B | MolmoWeb 8B |
| Lifecycle | active | active |
| Released | 2026-03-20 | 2026-03-20 |
| Knowledge cutoff | Unknown | Unknown |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 10,240 | 10,240 |
| Total parameters | 4,850,869,200 | 8,661,703,120 |
| Active parameters | Unknown | Unknown |
| License | apache-2.0 | apache-2.0 |
| Open weights | Yes | Yes |
| API available | No | No |
| Self-hostable | Yes | Yes |
| Provider access | Unknown | Unknown |
| Capabilities | chat, computer-use, generation, tools, vision | chat, computer-use, generation, tools, vision |
15 comparable fields · 3 material differences · Editorially curated pair passes the primary-source comparison gate
MolmoWeb 4B Capabilities
MolmoWeb 8B Capabilities
Internal Comparison Graph
Related Comparisons
| A | Pair | B | Context |
|---|---|---|---|
MolmoWeb 4BAi2 | vs | cross-developer peersimage, text | |
MolmoWeb 8BAi2 | vs |  Ministral-3-8B-Reasoning-2512Mistral AI | cross-developer peersimage, text |
MolmoWeb 8BAi2 | vs | Ministral-3-8B-Instruct-2512Mistral AI | cross-developer peersimage, text |
MolmoWeb 4BAi2 | vs | Ministral-3-3B-Reasoning-2512Mistral AI | cross-developer peersimage, text |
MolmoWeb 4BAi2 | vs | Ministral-3-3B-Instruct-2512Mistral AI | cross-developer peersimage, text |
MolmoWeb 8BAi2 | vs | Ministral-3-14B-Reasoning-2512Mistral AI | cross-developer peersimage, text |
MolmoWeb 8BAi2 | vs |  Muse Glimmer 30BMeta | cross-developer peersimage, text |
MolmoWeb 4BAi2 | vs | Mistral Large 3Mistral AI | cross-developer peersimage, text |
MolmoWeb 4BAi2 | vs | Ministral-3-14B-Instruct-2512Mistral AI | cross-developer peersimage, text |
Molmo2-8BAi2 | vs | MolmoWeb 8BAi2 | developer peersimage, text |
MolmoWeb 8BAi2 | vs | Ministral-8B-Instruct-2410Mistral AI | cross-developer peerstext |
MolmoWeb 8BAi2 | vs |  phi-4Microsoft | cross-developer peerstext |
Primary Evidence
Sources and Freshness
Questions
MolmoWeb 4B vs MolmoWeb 8B FAQs
Is MolmoWeb 4B or MolmoWeb 8B better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both MolmoWeb 4B and MolmoWeb 8B, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, MolmoWeb 4B or MolmoWeb 8B?+
Neither model has a directly sourced input price in this comparison. Neither model has a directly sourced output price in this comparison.
Which has a larger context window, MolmoWeb 4B or MolmoWeb 8B?+
Neither model has a larger sourced context window in this comparison. MolmoWeb 4B is 10,240 and MolmoWeb 8B is 10,240.
Which performs better in benchmarks, MolmoWeb 4B or MolmoWeb 8B?+
There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.
Can MolmoWeb 4B or MolmoWeb 8B be self-hosted?+
Both models have the same recorded self-hosting status: supported. MolmoWeb 4B is open weight; MolmoWeb 8B is open weight.
Can MolmoWeb 4B and MolmoWeb 8B understand images?+
MolmoWeb 4B is documented with image input; MolmoWeb 8B is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, MolmoWeb 4B or MolmoWeb 8B?+
Neither has a larger sourced maximum output. MolmoWeb 4B is — and MolmoWeb 8B is —.
Do MolmoWeb 4B and MolmoWeb 8B support reasoning and tool use?+
MolmoWeb 4B: tool calling and image input. MolmoWeb 8B: tool calling and image input. Feature support does not establish relative quality.
Which is available from more inference providers, MolmoWeb 4B or MolmoWeb 8B?+
MolmoWeb 4B has 0 sourced provider routes; MolmoWeb 8B has 0, a tie.
Which offers better value, MolmoWeb 4B or MolmoWeb 8B?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.