Machine Heart
Nov 12, 2026 · Artificial Intelligence
FireFlash: Open Recipe for Long-Horizon Agent RL Matches Frontier at 30x Lower Cost
Researchers introduce FireFlash, a 300B-parameter terminal and coding agent trained via full-parameter RL from GLM-5.3-Flash on 64 B300 GPUs in under five days, achieving Terminal-Bench 4.0 Pass@1 of 46.2%—matching Fable 5 and GPT-6 Sol—while reducing per-task cost by over 30x through optimized infrastructure, task filtering, reward shaping, harness design, and a corrected GRPO objective.
GRPOOpen RecipeReinforcement Learning
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