Molmo Base: pricing, context window and benchmarks
Molmo Base is a open-weight model from Allen Institute for AI. It offers a 4,096-token context window, costs $2.02 per million input tokens and $7.53 per million output tokens, and averages 65.0 across the index's benchmark suite.
Pricing
Molmo Base costs $2.02 per million input tokens and $7.53 per million output tokens. A blended 3:1 input-to-output mix works out to about $3.40 per million tokens. Cached input is listed at $0.23 per million tokens.
| Item | Price | Notes |
|---|---|---|
| Input | $2.02 | per 1M tokens |
| Output | $7.53 | per 1M tokens |
| Cached input | $0.23 | per 1M tokens |
| Blended 3:1 | $3.40 | estimate per 1M tokens |
| 1M in + 1M out | $9.55 | estimate |
Benchmarks
Scores below are modelled estimates on a 0–100 scale. Use them to compare relative position, not as official vendor results.
| Benchmark | Score | Rank | Percentile | Relative |
|---|---|---|---|---|
| MMLU-Pro | 68.5 | 411 | 32th | |
| GPQA Diamond | 59.9 | 406 | 32th | |
| SWE-bench Verified | 50.2 | 420 | 30th | |
| HumanEval | 69.9 | 396 | 34th | |
| MATH-500 | 69.1 | 386 | 36th | |
| AIME 2025 | 58.2 | 398 | 34th | |
| LiveCodeBench | 51.9 | 430 | 28th | |
| IFEval | 75.5 | 393 | 35th | |
| TruthfulQA | 71.4 | 391 | 35th | |
| HellaSwag | 77.6 | 406 | 32th | |
| MMMU | 62.4 | 405 | 33th | |
| Arena Elo | 1318.8 | 396 | 34th |
What Molmo Base is good for
Molmo Base is an open-weight model, so it can be self-hosted or run through a third-party inference provider. That matters for data residency, fine-tuning and long-run cost control. At $2.02 per million input tokens (hosted list price) and a 4,096-token context window, it is a practical option for teams that want more control than a closed API allows.
Strengths
- Input price of $2.02 per million tokens is at or below the index median.
- Open weights make self-hosting, fine-tuning and data-residency review possible.
- Accepts more than text, including image input where the provider supports it.
Trade-offs
- Context window of 4,096 tokens is small for long-document work.
- Average benchmark score is below the index median; test it on your own task.
How it compares
| Model | Provider | Context | Input / 1M | Avg score |
|---|---|---|---|---|
| StableLM 2 Instruct | Stability AI | 16384 | $1.93 | 65.2 |
| Reka Core Nano | Reka AI | 16384 | $5.45 | 65.1 |
| Molmo Base | Allen Institute for AI | 4096 | $2.02 | 65.0 |
| Nemotron Nano Base | NVIDIA | 8192 | $1.85 | 65.0 |
| Nova Lite Mini | Amazon | 16384 | $5.43 | 65.0 |
| StableLM 2 | Stability AI | 8192 | $1.91 | 65.0 |
FAQ
How much does Molmo Base cost?
Molmo Base is listed at $2.02 per million input tokens and $7.53 per million output tokens. Cached input is $0.23 per million tokens. A blended 3:1 input-to-output mix is about $3.40 per million tokens.
What is the context window of Molmo Base?
Molmo Base has a context window of 4,096 tokens and can emit up to 4,096 output tokens per request in this index.
Is Molmo Base open weights?
Yes. Molmo Base is listed as an open-weight model under a open weights licence.
How does Molmo Base score on benchmarks?
Molmo Base averages 65.0 across the scored benchmarks in this index, ranking #403 of 600 models. Its strongest relative result is Arena Elo at 1318.8.
What is Molmo Base best for?
Molmo Base is an open-weight model, so it can be self-hosted or run through a third-party inference provider. That matters for data residency, fine-tuning and long-run cost control. At $2.02 per million input tokens (hosted list price) and a 4,096-token context window, it is a practical option for teams that want more control than a closed API allows.