thinking is enabled but reasoning_content is missing in assistant tool call message at index ...

[jc01rho]

Description

using 1.14.33, TUI, with opencode go, kimi-2.6 and deepseek-v4-pro,

kimi

Server: cloudflare\n\nBody:\n{\"error\":{\"message\":\"Error from provider: Provider returned error\",\"code\":400,\"metadata\":{\"raw\":\"{\\\"error\\\":{\\\"message\\\":\\\"thinking is enabled but reasoning_content is missing in assistant tool call message at index 13\\\",\\\"type\\\":\\\"invalid_request_error\\\"}}\",\"provider_name\":\"Moonshot AI\",\"is_byok\":true}},\"user_id\":\"user_2z4xm5LomaIHfsnVqMhFsWrVrGY\"}

deepseek

Server: cloudflare\n\nBody:\n{\"error\":{\"message\":\"Error from provider (DeepSeek): The `reasoning_content` in the thinking mode must be passed back to the API.\",\"type\":\"invalid_request_error\",\"param\":null,\"code\":\"invalid_request_error\"}}\n"

i think releated with
#24722
#23887

Plugins

omo

OpenCode version

1.14.33

Steps to reproduce

hard to reproduce it. sorry.

Screenshot and/or share link

No response

Operating System

windows 11, wsl ubuntu24

Terminal

windows terminal

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• DeepSeek thinking mode: reasoning_content not passed back for tool call turns, causing 400 errors #24722: Same root cause — reasoning_content missing from assistant tool call messages when thinking mode is enabled, causing 400 errors. The issue you reported appears to be the same underlying bug affecting Kimi models in addition to DeepSeek.

[jc01rho]

just read #24442, With using custom provider, with options.interleaved.field : "reasoning_content" , not a openroter, this is opencode go

[rekram1-node]

Send me a session plz: opencode export > session.json

This is a command to run this is NOT /export.

[jc01rho]

I cannot find specific session, cuz too many subagent session are listed :(

anyway I've trying workaround refer from https://github.com/router-for-me/CLIProxyAPI/blob/da6c599efd8da34d23d3668371fbb5ac70399e9d/internal/runtime/executor/kimi_executor.go#L326 , in testing

[jc01rho]

I cannot find specific session, cuz too many subagent session are listed :(

anyway I've trying workaround refer from https://github.com/router-for-me/CLIProxyAPI/blob/da6c599efd8da34d23d3668371fbb5ac70399e9d/internal/runtime/executor/kimi_executor.go#L326 , in testing

after applied this, works good so far.

[Suknna]

I am encountering the exact same API error when using the kimi-for-coding (k2p6) model.

It seems the OpenCode adapter is dropping the reasoning_content field from previous tool call messages when constructing the payload for the Kimi API.

Here is the error context exported from my session:

session.json

[Suknna]

@rekram1-node

[Suknna]

"I found that disabling OpenCode's native compaction and removing the @cortexkit/opencode-magic-context plugin completely resolves the reasoning_content is missing error for the Kimi k2.6 model, which strongly suggests the context pruning logic is improperly stripping reasoning fields from historical tool-call messages."