OpenRouter launched Fusion on June 12, a server-side API that sends a prompt to multiple models in parallel, then uses a judge and synthesizer to merge the best answer. On Perplexity's DRACO benchmark, a budget panel of Gemini 3 Flash, Kimi K2.6, and DeepSeek V4 Pro synthesized by Opus 4.8 scored 64.7%, within 1% of Fable 5's 65.3% at roughly half the cost. The timing coincides with an export control directive that forced Anthropic to suspend Fable 5 and Mythos 5 for foreign nationals. Fusion offers a default panel via "openrouter/fusion" or custom panels with no code. However, OpenRouter admits Fusion is not a full Fable replacement, especially for long-horizon tasks and coding. The launch sparked debate; some see it as democratizing AI, while skeptics cite poor coding and tool calling. The product runs on OpenRouter's infrastructure and does not bypass export controls.

Key facts

• Fusion sends prompts to parallel models, then uses a judge and synthesizer to combine answers.
• Budget panel (Gemini 3 Flash, Kimi K2.6, DeepSeek V4 Pro) scores 64.7% on DRACO, near Fable 5's 65.3%.
• Anthropic suspended Fable 5 and Mythos 5 due to U.S. export control directive.
• Fusion runs on OpenRouter's infrastructure and does not bypass export controls.
• Not a full Fable replacement, especially for long-horizon tasks and coding.