# Kimi own key usage error

**URL:** <https://forum.cursor.com/t/kimi-own-key-usage-error/159758>\
**Category:** Bug Reports\
**Tags:** byok, nightly\
**Created:** [May 5, 2026, 8:44am UTC](https://forum.cursor.com/t/kimi-own-key-usage-error/159758 "2026-05-05T08:44:00Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![furki](https://avatars.discourse-cdn.com/v4/letter/f/eb9ed0/32.png) [@furki](https://forum.cursor.com/u/furki)\
**Post date:** [May 5, 2026, 8:44am UTC](https://forum.cursor.com/t/kimi-own-key-usage-error/159758/1 "2026-05-05T08:44:00Z")

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### Where does the bug appear (feature/product)?

Cursor IDE

### Describe the Bug

When I use my own API key, I get the following error. (Kimi-2.6)

Request ID: f8e77e31-d5ef-49af-8b1c-e46a6d6359f3  
{“error”:“ERROR\_PROVIDER\_ERROR”,“details”:{“title”:“Provider Error”,“detail”:“Provider returned error: {"error":{"message":"thinking is enabled but reasoning\_content is missing in assistant tool call message at index 3","type":"invalid\_request\_error"}}”,“isRetryable”:false,“additionalInfo”:{},“buttons”:,“planChoices”:},“isExpected”:true}  
Provider Error Provider returned error: {“error”:{“message”:“thinking is enabled but reasoning\_content is missing in assistant tool call message at index 3”,“type”:“invalid\_request\_error”}}  
des: Provider Error Provider returned error: {“error”:{“message”:“thinking is enabled but reasoning\_content is missing in assistant tool call message at index 3”,“type”:“invalid\_request\_error”}}  
at g8y (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:28853:25419)  
at p8y (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:28853:24303)  
at C8y (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:28854:6490)  
at e4d.run (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:28854:11311)  
at async Ups.runAgentLoop (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:41180:14333)  
at async C0h.streamFromAgentBackend (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:41248:12259)  
at async C0h.getAgentStreamResponse (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:41248:19484)  
at async Mbt.submitChatMaybeAbortCurrent (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:28969:17002)  
at async za (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:40232:4234)

### Steps to Reproduce

When I use my own API key, it works in agent mode as long as the K2.6 model is selected.

### Operating System

MacOS

### Version Information

Version: 3.3.4 (Universal)  
VSCode Version: 1.105.1  
Commit: e7262be617643fb2bd412dfdcca2ed82b21d0fa0  
Date: 2026-05-03T00:48:29.057Z  
Layout: editor  
Build Type: Stable  
Release Track: Nightly  
Electron: 39.8.1  
Chromium: 142.0.7444.265  
Node.js: 22.22.1  
V8: 14.2.231.22-electron.0  
OS: Darwin arm64 25.4.0

### For AI issues: which model did you use?

Kimi K2.6

### Does this stop you from using Cursor

Sometimes - I can sometimes use Cursor

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<div class="post-metadata">

**Author:** ![deanrie](https://sea3.discourse-cdn.com/cursor1/user_avatar/forum.cursor.com/deanrie/32/1263_2.png) [@deanrie](https://forum.cursor.com/u/deanrie)\
**Post date:** [May 5, 2026, 9:15am UTC](https://forum.cursor.com/t/kimi-own-key-usage-error/159758/5 "2026-05-05T09:15:48Z")

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Hey, this is a known BYOK bug for providers that require `reasoning_content` passback like Kimi K2.6, DeepSeek V4, and similar. The first turn works, but on the next tool calls the provider returns 400 “thinking is enabled but reasoning\_content is missing”. The same issue is discussed here: [Kimi 2.6 custom model - Provider returned error: {"error":{"message":"thinking is enabled but reasoning\_content is missing](https://forum.cursor.com/t/kimi-2-6-custom-model-provider-returned-error-error-message-thinking-is-enabled-but-reasoning-content-is-missing/159625)

We’re tracking it, but there’s no ETA for a fix yet. I grabbed the Request ID and I’ll link it to the ticket.

As a workaround, you can temporarily use the non-thinking Kimi option where reasoning passback isn’t required, or use another model in agent mode with tool calls. I’ll follow up once there’s an update.

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<div class="post-metadata">

**Author:** ![deanrie](https://sea3.discourse-cdn.com/cursor1/user_avatar/forum.cursor.com/deanrie/32/1263_2.png) [@deanrie](https://forum.cursor.com/u/deanrie)\
**Post date:** [May 5, 2026, 9:16am UTC](https://forum.cursor.com/t/kimi-own-key-usage-error/159758/6 "2026-05-05T09:16:36Z")

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Split this topic on May 5, 2026, 9:16am UTC

A post was merged into an existing topic: [Kimi/kimi-k2.5 cannot be called to execute tool calls in cursor](https://forum.cursor.com/t/kimi-kimi-k2-5-cannot-be-called-to-execute-tool-calls-in-cursor/155922)

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<div class="post-metadata">

**Author:** ![deanrie](https://sea3.discourse-cdn.com/cursor1/user_avatar/forum.cursor.com/deanrie/32/1263_2.png) [@deanrie](https://forum.cursor.com/u/deanrie)\
**Post date:** [May 5, 2026, 9:16am UTC](https://forum.cursor.com/t/kimi-own-key-usage-error/159758/7 "2026-05-05T09:16:47Z")

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Closed on May 5, 2026, 9:16am UTC