In brief
OpenRouter launched Fusion on June 12, a server-side API that fans a prompt to a panel of models, then uses a judge and synthesizer to merge the best answer.
On Perplexity's DRACO benchmark, a budget panel of different AIs landed within 1% of Fable 5 at roughly half the cost.
The technique emerged as a U.S. export control directive forced Anthropic to suspend Fable 5 and Mythos 5.
OpenRouter has launched an API built around a simple bet: that a panel of cheap AI models, combined the right way, can match a single expensive one. And by “expensive,” they mean Claude Fable 5.The product is called Fusion. It sends a prompt to multiple models in parallel, then uses a judge model and a synthesizer to merge the results into one grounded answer.The timing is fortuitous. Shortly after releasing Fable 5 and Mythos 5 last week, a U.S. export control directive forced Anthropic to suspend those models for every foreign national worldwide, citing a disputed jailbreak finding. OpenRouter took the news to X the next day, leaning straight into the gap with a promise of "Fable-level intelligence at half the price."
