OpenRouter launched Fusion API to match Claude Fable 5 at half cost

OpenRouter launched Fusion on June 12, a compound-model API that fans a prompt to a panel of models and merges the best answer using a judge and synthesizer. On Perplexity's DRACO benchmark, a budget panel achieved within 1% of Claude Fable 5 at roughly half the cost. The launch coincides with Anthropic suspending Fable 5 due to export controls.