OpenRouter Fusion First Test – Does THIS Beat Claude Fable?
OpenRouter Fusion, which synthesizes outputs from multiple models via a judge model, shows strong performance on deep research tasks but underperforms on coding compared to individual frontier models like Claude Fable 5. In tests, the quality preset (using Opus 4.8, GPT 5.5, Gemini 3.1 Pro) produced a superior deep research report versus Gemini alone, but coding results were mediocre and cost significantly more (≈$20 total). The budget preset (Gemini Flash, DeepSeek V4 Flash, Moonshot Kimmy) was cheaper but yielded lower-quality code.