OpenRouter has launched Fusion API, a composite model that uses multiple AI models to replicate the capabilities of Anthropic's Claude Fable 5. This comes after the US government imposed export controls on Fable 5, making it unavailable globally. Fusion API combines models like Gemini 3 Flash, Kimi K2.6, and DeepSeek V4 Pro, and has shown comparable performance to Fable 5 in the DRACO benchmark tests, at a significantly lower cost. The system employs a multi-step process involving parallel model calls, a 'referee' model for analysis, and a 'lead writer' model for the final output, offering developers a more cost-effective and flexible alternative. AI
IMPACT Offers a cost-effective and flexible alternative to single, high-cost frontier models, potentially accelerating adoption of multi-model strategies.
RANK_REASON This is a product launch by a platform that aggregates AI models, not a frontier model release from a core AI lab.
- Anthropic
- Claude Fable 5
- Claude Opus 4.8
- DeepSeek V4 Pro
- DRACO
- Fusion API
- Gemini 3 Flash
- GPT-5.5
- Kimi K2.6
- OpenRouter
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