Flint-40B-A2.5B

Recursive's coding-agent MoE released 2026-10-21 (Apache-2.0): 39.8B total parameters, about 2.5B active per token (including the output head; the body alone is ~2.2B — the official size designation is 40B-A2.5B). Architecture: 49 layers (2 dense + 47 MoE), 256 routed experts with 6 selected per token plus an always-active shared expert; attention is 35 sliding-window layers (513-token window) plus 14 full-attention layers, RoPE on sliding-window layers and no positional encoding on full-attention ones, with per-head QK RMSNorm and attention sinks. 262,144-token context, 150,144 vocabulary, knowledge cutoff June 2026. Release evaluations: Terminal-Bench 2.1 54.9%, SWE-bench Pro v2 89.7%, SWE-bench Verified 74.2% (Recursive-measured, temperature 1.0, average pass@1 over at least five attempts). BF16 weights are about 80GB; community GGUFs (unsloth) run UD-Q4_K_XL at 25.1GB, Q8_0 at 42.3GB and UD-IQ1_M at 11.4GB. TechCrunch and WIRED report the model was largely built by AI in under four months.