Twitter/X

On 2026-03-20, @phytalia amplified Fynn (@fynnso)'s claim that Cursor exposed the…

2026-03-20 · 11:54 UTC ·@phytalia ·0 min read

Brief

@phytalia reposts Fynn's observation that changing Cursor's OpenAI base URL revealed a model identifier pointing to kimi-k2p5-rl-0317-s515-fast. The claim is that Cursor's Composer 2 is effectively Kimi K2.5 with reinforcement learning, and the post mocks Cursor for leaving the original model name visible in production tooling.

Why it matters

On 2026-03-20, @phytalia amplified Fynn (@fynnso)'s claim that Cursor exposed the model path `accounts/anysphere/models/kimi-k2p5-rl-0317-s515-fast` when its OpenAI base URL was modified.

Key details

  • The post alleges Cursor's Composer 2 is using Moonshot AI's Kimi K2.5 RL model, based on the visible identifier `kimi-k2p5-rl-0317-s515-fast`.
  • @phytalia framed the finding as evidence Cursor should hire more Chinese talent and criticized the company for not even renaming the underlying model ID.
Source evidence

title: @phytalia: cursor needs more chinese hires tbh

Fynn (@fynnso)

was messing with the OpenAI base URL in Cursor...
author: @phytalia
contenttype: tweet
publication: Twitter/X
published: 2026-03-20T11:54:32+00:00
sourceurl: https://x.com/phytalia/status/2034961789214236859

word_count: 38

cursor needs more chinese hires tbh

Fynn (@fynnso)

was messing with the OpenAI base URL in Cursor and caught this

accounts/anysphere/models/kimi-k2p5-rl-0317-s515-fast

so composer 2 is just Kimi K2.5 with RL
at least rename the model ID

— https://nitter.net/fynnso/status/2034706304875602030#m