GPT-5.3 Codex Spark
- Released
- 9mo ago
Cursor's agent coding model, made by scaling reinforcement learning on the same pretrained model as Composer 1. Available only in Cursor.
How it compares
Frequently asked questions
Capabilities and specs
No, Composer 1.5 only accepts text as input, so it cannot read images, audio, video or PDFs.
Quality and benchmarks
The closest alternatives, matched on model kind and release date with no comparable price, are GPT-5.3 Codex Spark by OpenAI, Seed 2.0 Pro by ByteDance and Qwen3.5 Plus by Alibaba.
GPT-5.3 Codex SparkComposer 1.5 vs GPT-5.3 Codex SparkSeed 2.0 ProComposer 1.5 vs Seed 2.0 ProQwen3.5 PlusComposer 1.5 vs Qwen3.5 Plus
Kimi K3 is the best open-weight alternative, as the highest-ranked open-weight model on Arena Text at rank 19.
Licensing and access
No, Composer 1.5 is closed and distributed under a proprietary license.
Basics
Composer 1.5 was made by Cursor and released on February 9, 2026.
Generated from Vertical Tabs data, updated November 9, 2026.
Discussion
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