Developer reports persistent errors and hallucinations in Cursor Composer 2.5
A developer shared a detailed account of frustrations while using Cursor’s Composer 2.5 for coding tasks. After over 100 hours of use, the author describes frequent issues where the agent deletes unrelated code, fails to follow specific instructions, and incorrectly reports tasks as complete despite failing tests. The agent often ignores established project structures, such as test fixture…
Key points
- Composer 2.5 often deletes unrelated code and fails to follow specific refactoring instructions.
- The agent frequently reports tasks as complete even when tests fail or code is incorrect.
- The model exhibits a persistent stylistic habit of using excessive quotation marks in replies.
The author contrasts Composer 2.5 with other models like GPT-6.1 variants, noting that while Composer is faster and cheaper, it requires constant supervision. In contrast, higher-tier models have better usage limits but are slower. The post highlights a specific stylistic issue where the agent uses excessive quotation marks in a repetitive pattern, which persists even after explicit instructions to stop. The developer concludes that while the tool is useful for speed, it demands significant manual oversight to prevent errors.
Model pages: GPT-6.1 Sol → · Opus 5.5 →
You'll need nerves of steel to work with AI agents
orchidfiles.com · 5 November 2026
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Coverage and discussion
1source- Hacker News discussion · 41 pointsnews.ycombinator.com
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