Introducing Composer 2

Introduced Composer 2, a new frontier-level AI coding agent. This release focuses on improved intelligence and cost-effectiveness, with pricing at $0.50/M input and $2.50/M output tokens. A faster variant is also available. The post highlights performance gains on benchmarks like Terminal-Bench 2.0 and SWE-bench Multilingual, attributing these improvements to continued pretraining and reinforcement learning on long-horizon tasks.