Fusion Nano: pricing, context window and benchmarks
Fusion Nano is a mid-range model from OpenRouter. It offers a 8,192-token context window, costs $2.96 per million input tokens and $14.36 per million output tokens, and averages 56.8 across the index's benchmark suite.
Pricing
Fusion Nano costs $2.96 per million input tokens and $14.36 per million output tokens. A blended 3:1 input-to-output mix works out to about $5.81 per million tokens. Cached input is listed at $0.39 per million tokens.
| Item | Price | Notes |
|---|---|---|
| Input | $2.96 | per 1M tokens |
| Output | $14.36 | per 1M tokens |
| Cached input | $0.39 | per 1M tokens |
| Blended 3:1 | $5.81 | estimate per 1M tokens |
| 1M in + 1M out | $17.32 | 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 | 64.5 | 461 | 23th | |
| GPQA Diamond | 50.7 | 515 | 14th | |
| SWE-bench Verified | 41.8 | 501 | 17th | |
| HumanEval | 61.0 | 488 | 19th | |
| MATH-500 | 59.7 | 468 | 22th | |
| AIME 2025 | 45.4 | 495 | 18th | |
| LiveCodeBench | 42.8 | 518 | 14th | |
| IFEval | 66.5 | 510 | 15th | |
| TruthfulQA | 63.8 | 472 | 21th | |
| HellaSwag | 72.5 | 486 | 19th | |
| MMMU | 55.9 | 490 | 18th | |
| Arena Elo | 1263.0 | 470 | 22th |
What Fusion Nano is good for
Fusion Nano is a general-purpose model in the index. It handles text generation, summarization and question answering, and it can be a sensible default when you need a balance of quality, price and context. At $2.96 per million input tokens with a 8,192-token window, check its benchmark profile against the specific task before committing.
Strengths
- Input price of $2.96 per million tokens is at or below the index median.
Trade-offs
- Proprietary licence: you cannot download the weights or self-host the model.
- Context window of 8,192 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 |
|---|---|---|---|---|
| DeepSeek-V3.2 1.5B | DeepSeek | 4096 | $1.02 | 56.9 |
| Nemotron 4 7B | NVIDIA | 16384 | $1.05 | 56.9 |
| Fusion Nano | OpenRouter | 8192 | $2.96 | 56.8 |
| Kimi K2 1.5B | Moonshot AI | 4096 | $0.99 | 56.8 |
| Phi-4 7B | Microsoft | 8192 | $0.91 | 56.8 |
| Llama 3.3 Groq 7B | Groq | 16384 | $1.01 | 56.7 |
FAQ
How much does Fusion Nano cost?
Fusion Nano is listed at $2.96 per million input tokens and $14.36 per million output tokens. Cached input is $0.39 per million tokens. A blended 3:1 input-to-output mix is about $5.81 per million tokens.
What is the context window of Fusion Nano?
Fusion Nano has a context window of 8,192 tokens and can emit up to 8,192 output tokens per request in this index.
Is Fusion Nano open weights?
No. Fusion Nano is a proprietary model with a proprietary licence, so you cannot download the weights.
How does Fusion Nano score on benchmarks?
Fusion Nano averages 56.8 across the scored benchmarks in this index, ranking #492 of 600 models. Its strongest relative result is Arena Elo at 1263.0.
What is Fusion Nano best for?
Fusion Nano is a general-purpose model in the index. It handles text generation, summarization and question answering, and it can be a sensible default when you need a balance of quality, price and context. At $2.96 per million input tokens with a 8,192-token window, check its benchmark profile against the specific task before committing.