12:00
2026-07-29
lightningjar.com
ai-safety
Study OW: The open-weight backfill: the cheapest model passed everything; two frontiers failed the same gate
A study backfill found that open-weight model gpt-oss-120b passed all 13 guardrail gates for $0.33 in API spend, while frontier models moonshotai/kimi-k3 and anthropic/claude-fable-5 both failed the sā¦