Anthropic · Mythos · GPT · Claude · Decrypt
OpenRouter's Fusion Promises Claude Fable-Level AI for Cheap—Right as Fable 5 Goes Dark
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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.
Key facts
- Fable 5 paired with OpenAI’s GPT-5.5 and synthesized by Opus topped the chart at 69%
- Even pairing Opus 4.8 with a separate instance itself scored 65.5%, a 6.7-point jump over solo Opus; OpenRouter says roughly three quarters of that lift comes from the synthesis step itself, the rest
- 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
- Skeptics pushed back on the framing, however, citing bad coding results, poor tool calling, and a lack of transparency since Fable 5 isn’t available anymore to compare results
Summary
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. The timing is fortuitous.