# BYOK + custom base URL: built-in Kimi K3 and K2.7-Code return 404, but K2.7-Code-Highspeed works

**URL:** <https://forum.cursor.com/t/byok-custom-base-url-built-in-kimi-k3-and-k2-7-code-return-404-but-k2-7-code-highspeed-works/175557>\
**Category:** Bug Reports\
**Tags:** byok\
**Created:** [October 21, 2026, 7:59am UTC](https://forum.cursor.com/t/byok-custom-base-url-built-in-kimi-k3-and-k2-7-code-return-404-but-k2-7-code-highspeed-works/175557 "2026-10-21T07:59:48Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![Diego\_Parima](https://avatars.discourse-cdn.com/v4/letter/d/4491bb/32.png) [@Diego\_Parima](https://forum.cursor.com/u/Diego_Parima)\
**Post date:** [October 22, 2026, 8:36pm UTC](https://forum.cursor.com/t/byok-custom-base-url-built-in-kimi-k3-and-k2-7-code-return-404-but-k2-7-code-highspeed-works/175557/8 "2026-10-22T20:36:36Z")

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Same root cause on Cursor Enterprise with Override OpenAI Base URL pointed at a company AI gateway (TrueFoundry), not Moonshot.

What worked for me: a custom model ID that did not match a Cursor catalog entry hit the gateway (verified with matching gateway usage + Cursor token-rate, not full model cost).

What broke after ~mid-October: the same pattern as this thread — once the name collides with / is treated as a built-in (Kimi family), Override Base URL stops applying, I get 404 / resource-not-found, and nothing reaches the gateway. Staff confirmation here matches what I see: built-in Kimi is Cursor-hosted; the override is ignored.

Ask: route by selection — custom/gateway models → Override Base URL; catalog models → Cursor when selected. Also please don’t reserve provider model IDs so BYOK cannot use the exact ID the gateway expects.

I’m filing a Feature Request for Enterprise gateway BYOK + Override Anthropic Base URL as well. Feature Request: [https://forum.cursor.com/t/enterprise-byok-ai-gateway-built-ins-ignore-override-base-url-need-anthropic-override/175824?u=diego\_parima](https://forum.cursor.com/t/enterprise-byok-ai-gateway-built-ins-ignore-override-base-url-need-anthropic-override/175824)

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