Developer finds Luna 6 is a 'massive downgrade' from Luna 5.6 despite better benchmarks
skilliard7 · reddit · 2026-09-23
A developer maintaining an agentic reporting tool reports that Luna 6 is a "massive downgrade" over Luna 5.6, despite slightly better benchmarks and a 50% lower price. In A/B tests at high effort level:
- On every eval involving reviewing written reports and finding relevant items, Luna 6 missed one or more relevant items while Luna 5.6 did not;
- Luna 6 answers in as few tokens as possible, e.g. replying "I found 7 items" without listing them, forcing follow-up questions;
- Across many use cases, the author could not find a single instance where Luna 6 beat 5.6.
He is sticking with Luna 5.6. The takeaway: benchmark scores can diverge badly from real agentic workflow performance — always A/B test on your own tasks before upgrading.
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