River API fine-tunes open-weight models to beat Astra at under 1% cost

Igor Babuschkin @ibabOriginally posted 2026.10.08

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We show how you can use the River API to fine-tune open weight models to beat GPT-6 Astra and Claude Opus 5.5 on tasks you care about, with less than 1% of the cost! A few years from now most of the LLM usage in the world will run on customized open weight models. Building your own custom models is getting easier and more affordable. Our mission is to help everyone own their own intelligence and be independent of big AI labs.

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