Composer 1.5
Composer 1.5 is an AI model released by Cursor (now part of SpaceXAI) on Monday, Feb 9 2026, 82 days after Grok 4.1 Fast. Benchmark results (shown below) cover Next.js Evals.
Benchmarks
Next.js coding
Next.js EvalsVercel's open eval of how well AI coding agents build and migrate real Next.js apps — measured as the share of tasks the agent completes successfully. Higher is better.
67%
#20 of 25Best: Composer 2.5 · 92%
Composer 1.5 — frequently asked questions
- When was Composer 1.5 released?
- Composer 1.5 was released by Cursor (now part of SpaceXAI) on Monday, Feb 9 2026.
- Who made Composer 1.5?
- Composer 1.5 was built by Cursor (now part of SpaceXAI). Elon Musk's AI company building the Grok series of models. Founded in 2023 as xAI, now part of SpaceX. Cursor (Anysphere) and its Composer coding models were acquired in 2026 and are tracked here.
- What benchmark scores did Composer 1.5 get?
- Composer 1.5 reports 1 tracked benchmark score — Next.js Evals: 67%. Scores are the figures published at release by Cursor (now part of SpaceXAI).
- Is Composer 1.5 open source?
- No. Composer 1.5 is a proprietary model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.
- What came before and after Composer 1.5?
- SpaceXAI's previous tracked release was Grok 4.1 Fast on Nov 19 2025, 82 days earlier. It was followed by Grok 4.20 Beta on Feb 17 2026.