We introduce FireFlash, a 300B-scale model tailored for long-horizon agentic tasks. FireFlash excels as a terminal and coding agent, achieving 46.2% on Terminal-Bench 4.01, putting it on par with Fable 5 and GPT-6 Sol, while costing over 30× less per task than Fable 5 at maximum effort (Figure 1). These gains also transfer to software engineering benchmarks, including DeepSWE v1.12 and SWE-Bench Pro Verified3 (Table 1). While frontier labs scale reinforcement learning across thousands of GPUs, we reach the performance-cost Pareto frontier under 5 days using 64 NVIDIA B300 GPUs. Three key factors make this possible: (1) careful curation of agentic RL environments so that every task provides a reliable signal at the right difficulty; (2) an RL recipe built for long, stale, and low-precision rollouts; and (3) an optimized coding harness tailored to the model for both training and evaluation. Together, these components bring frontier efficiency to a hundred-GPU-scale cluster, and we are releasing the full recipe. Blog Post : https://agenteconomics.org/posts/agentic-rl-recipe Tweet : https://x.com/kaiwei_chang/status/2117378474654781780 Open weights : Soon   submitted by   /u/pmttyji [link]   [comments]