Cursor Composer 2 ships
Cursor launched Composer 2 powered by Kimi-k2.5 via Fireworks AI, and Kimi.ai publicly celebrated the release—highlighting momentum in open-model tooling for developer workflows. The social buzz around the launch underscores growing interest in integrated AI coding tools. (x.com) (x.com)
Moonshot AI’s official account publicly congratulated Cursor and said Composer 2 “accesses Kimi K2.5 via Fireworks AI” under an authorized commercial partnership. (techmeme.com) Developers unearthed an internal model ID — accounts/anysphere/models/kimi-k2p5-rl-0317-s515-fast — that tied Composer 2 to Kimi K2.5, a discovery shared in a viral tweet that drew hundreds of thousands of views. (analyticsindiamag.com) Cursor co‑founder Aman Sanger and VP of Developer Education Lee Robinson acknowledged the omission of the base-model attribution on X and said Kimi K2.5 was chosen after perplexity evaluations across multiple base models. (economictimes.indiatimes.com) Moonshot’s Kimi K2.5 is described in its docs and Hugging Face entry as an open-source multimodal agentic model trained on roughly 15 trillion visual-and-text tokens and offering up to a 256K token context window. (huggingface.co) Cursor published Composer 2 pricing at $0.50 per million input tokens and $2.50 per million output tokens in its launch blog, and Fireworks announced “day‑0” support plus a private preview for full‑parameter RL fine‑tuning of Kimi K2.5. (cursor.com) Early benchmark write‑ups report Composer 2 outperforming Anthropic’s Claude Opus 4.6 on many coding tasks while still lagging behind GPT‑5.4 in broader comparisons, according to independent tests published this week. (venturebeat.com)
