Muse Spark 1.2 by Meta AI

Muse Spark 1.2 is Meta’s coding-focused update to Muse Spark 1.1, released 5 August 2026 alongside the Muse Code terminal agent it was co-trained with. It has a 1,048,576-token context window and was trained on long-horizon coding work including whole-repository generation and multi-hour GPU kernel optimisation. On Meta’s published numbers it scores 82.9% pass@1 on Terminal-Bench 2.1 and 59.3% on DeepSWE 1.1. Two API tiers: standard at $1.25/$4.25 per million input/output tokens, or a contributor tier at $0.10/$0.20 where Meta trains on your traffic.