Composer 2.5
Released
Composer 2.5 is an AI model released by Cursor (now part of SpaceXAI) on Monday, May 18 2026, 31 days after Grok 4.3 Beta. Benchmark results (shown below) cover SWE-Bench Pro, SWE-Bench Multilingual, DeepSWE 1.0, Next.js Evals, Terminal-Bench 2.1, Terminal-Bench 2.0, and 1 more.
Benchmarks
Coding
SWE-Bench ProAgentic coding — Can the AI fix real bugs in real software? It's handed actual problems from open-source projects and has to write code that genuinely solves them. Higher is better.
54%
#19 of 23Best: Claude Fable 5.1 · 81.2%
SWE-Bench MultilingualMultilingual coding — Like SWE-Bench, but the coding problems span many programming languages, not just one. Tests how broadly the AI can code. Higher is better.
79.8%
#7 of 14Best: Claude Opus 5 · 89.5%
DeepSWE 1.0Agentic coding — Artificial Analysis' independent test of deep, agentic software-engineering work — the AI has to plan and carry out substantial coding tasks end to end. Higher is better.
18%
#6 of 6Best: Kimi K3 · 67.5%
Next.js EvalsNext.js coding — Vercel'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.
81%
#5 of 27Best: Claude Fable 5.1 · 97%
Terminal & CLI
Terminal-Bench 2.1Agentic terminal coding — Can the AI work in a command-line terminal — running commands and finishing technical setup tasks the way a developer would? Higher is better.
73%
#23 of 30Best: DeepSeek-V4.1-Flash · 90.6%
Terminal-Bench 2.0Agentic terminal coding — Can the AI work in a command-line terminal — running commands and finishing technical setup tasks the way a developer would? (Version 2.0 of the test.) Higher is better.
69.3%
#6 of 14Best: Claude Mythos 5 · 88%
Community preference
threejsevalCommunity preference (Three.js) — Every model gets the same prompt — "the Eiffel Tower", "a glass fishbowl", "a robot arm picking toys into a box" — and builds a 3D scene in Three.js. Real people then see two scenes side by side, names hidden, and vote for the one they prefer. The votes become a chess-style Elo rating on threejseval.com, averaged across all the prompts. It measures whether the scene looks and moves right to a human eye, not whether the code passes a test. Higher is better.
1120
#16 of 16Best: Claude Fable 5.1 · 2037
Compare Composer 2.5 with
Suggested comparisons
Composer 2.5vsGrok 4.6Composer 2.5vsGPT-6 AstraComposer 2.5vsClaude Fable 5.1Composer 2.5vsGemini 3.8 FlashComposer 2.5vsMuse Spark 1.3Composer 2.5vsDeepSeek-V4.1-FlashComposer 2.5vsMistral Medium 3.5Composer 2.5vsKimi K3Composer 2.5vsGLM-5.3-FlashComposer 2.5vsQwen3.8-Max-0902Composer 2.5vsNemotron 3.5 Lightning
Frequently asked questions
Composer 2.5 was released by Cursor (now part of SpaceXAI) on Monday, May 18 2026.