Composer 2 was built by Cursor (now part of SpaceXSI). Elon Musk's AI company building the Grok series of models. Founded in 2023 as xAI, merged into SpaceX as SpaceXAI in 2026 and renamed SpaceXSI (SpaceX Super Intelligence) that October. Cursor (Anysphere) and its Composer coding models were acquired in 2026 and are tracked here.

What benchmark scores did Composer 2 get?

Composer 2 reports 3 tracked benchmark scores — SWE-Bench Multilingual: 73.7%; Next.js Evals: 57%; Terminal-Bench 2.0: 61.7%. Tracked scores may come from lab reports or independent benchmarks; source details accompany the benchmark data.

Is Composer 2 open source?

No. Composer 2 is a closed 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 2?

SpaceXSI's previous tracked release was Grok 4.20 Beta on Feb 17 2026, 30 days earlier. It was followed by Grok 4.3 Beta on Apr 17 2026.

Composer 2

Released Mar 19 2026

Composer 2 is an AI model released by Cursor (now part of SpaceXSI) on Thursday, Mar 19 2026, 30 days after Grok 4.20 Beta. Benchmark results (shown below) cover SWE-Bench Multilingual, Next.js Evals, and Terminal-Bench 2.0.

Benchmarks

Coding

SWE-Bench Multilingual

73.7%

#16 of 26

Next.js Evalsvia Next.js Evals

57%

#26 of 36

Terminal & CLI

Terminal-Bench 2.0

61.7%

#11 of 28

Compare Composer 2 with

Composer 2

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About

Composer 2 was released by Cursor on March 19, 2026 as a coding agent model trained for longer software-engineering tasks. Cursor described its first continued-pretraining run for the line, followed by reinforcement learning on tasks requiring hundreds of actions. The model was designed to navigate a repository and carry work through multiple edits and tool interactions.

Cursor's announcement highlighted improvements on Terminal-Bench 2.0 and SWE-bench Multilingual. It also offered a faster serving variant at a higher token price, separating response speed from the model's stated intelligence. That gave users a deployment tradeoff while preserving the focus on practical coding inside the Cursor environment.

Frequently asked questions

: Composer 2 was released by Cursor (now part of SpaceXSI) on Thursday, Mar 19 2026.
: Composer 2 was built by Cursor (now part of SpaceXSI). Elon Musk's AI company building the Grok series of models. Founded in 2023 as xAI, merged into SpaceX as SpaceXAI in 2026 and renamed SpaceXSI (SpaceX Super Intelligence) that October. Cursor (Anysphere) and its Composer coding models were acquired in 2026 and are tracked here.
: Composer 2 reports 3 tracked benchmark scores — SWE-Bench Multilingual: 73.7%; Next.js Evals: 57%; Terminal-Bench 2.0: 61.7%. Tracked scores may come from lab reports or independent benchmarks; source details accompany the benchmark data.
: No. Composer 2 is a closed model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.
: SpaceXSI's previous tracked release was Grok 4.20 Beta on Feb 17 2026, 30 days earlier. It was followed by Grok 4.3 Beta on Apr 17 2026.