AllenAI: Molmo2 8B✓ Catalog verified
Molmo2-8B is an open vision-language model developed by the Allen Institute for AI (Ai2) as part of the Molmo2 family, supporting image, video, and multi-image understanding and grounding. It is based on Qwen3-8B and uses SigLIP 2 as its vision backbone, outperforming other open-weight, open-data models on short videos, counting, and captioning, while remaining competitive on long-video tasks.
Overview
Molmo2-8B is an open vision-language model developed by the Allen Institute for AI (Ai2) as part of the Molmo2 family, supporting image, video, and multi-image understanding and grounding. It is based on Qwen3-8B and uses SigLIP 2 as its vision backbone, outperforming other open-weight, open-data models on short videos, counting, and captioning, while remaining competitive on long-video tasks.
Access: available through the official Allenai API. Context window: 37K.
Specifications
| API identifier | allenai/molmo-2-8b |
| Provider | Allenai |
| Model type | Multimodal LLM |
| Context window | 37K catalog |
| Input modalities | text · image · video |
| Output modalities | text |
| Released | Jan 9, 2026 |
| Moderated | No |
| Architecture modality | text+image+video->text |
| Scheduled expiry | 2026-03-23 |
API defaults
{
"top_p": null,
"temperature": null,
"frequency_penalty": null
}Pricing
Live pricing components for allenai/molmo-2-8b as published in the catalog.
| Pricing component | Raw unit price | Normalized | Unit |
|---|---|---|---|
| Prompt tokens | $2e-7 | $0.20 / 1M | Per input token |
| Completion tokens | $2e-7 | $0.20 / 1M | Per output token |
| Request fee | N/A | N/A | Per request |
| Image fee | N/A | N/A | Per image unit |
| Web search fee | N/A | N/A | Per search request |
Cost calculator
Estimate monthly spend from your own token volumes.
Estimated Total Cost
$0.14Calculated from current list pricing in the ModelsAtlas catalog.Capabilities
| Capability | Status | What it means |
|---|---|---|
| Visual Understanding | ✓ Supported | Image and document analysis support |
| Audio Processing | Not advertised | Speech and voice aligned flows |
| Tool Calling | Not advertised | Supports tools / function calling |
| Self-Hosting | Not advertised | Deploy outside managed APIs |
Capability signals
Directional signals derived from model metadata and capability tags — not official benchmark submissions.
Quick start
Call AllenAI: Molmo2 8B through an OpenAI-compatible client.
from openai import OpenAI
client = OpenAI(
base_url="https://openrouter.ai/api/v1",
api_key="YOUR_API_KEY"
)
response = client.chat.completions.create(
model="allenai/molmo-2-8b",
messages=[{"role": "user", "content": "Explain quantum physics."}]
)
print(response.choices[0].message.content)Alternatives
Closest models by context window from a different provider.
| Model | Provider | Context | Input /1M | Actions |
|---|---|---|---|---|
| AionLabs: Aion-RP 1.0 (8B) | Aion Labs | 33K | $0.80 | View → |
| Arcee AI: Coder Large | Arcee Ai | 33K | $0.50 | View → |
Sources & attribution
Pricing and metadata are maintained in the ModelsAtlas catalog.
Frequently asked questions
How much does AllenAI: Molmo2 8B cost?
$0.20 per 1M input tokens and $0.20 per 1M output tokens on the official Allenai API.
What is the context window of AllenAI: Molmo2 8B?
AllenAI: Molmo2 8B supports up to 37K tokens of context.
Does AllenAI: Molmo2 8B support tool / function calling?
AllenAI: Molmo2 8B does not advertise first-class tool/function calling. Check vendor docs for the latest capabilities.
How do I access AllenAI: Molmo2 8B?
Use the official Allenai API with the model id `allenai/molmo-2-8b`. See the Quick start section above for code examples.