openclaw - 💡(How to fix) Fix [Bug]: OpenCode Go / Kimi K2.6 sends unsupported reasoning_details in replayed messages

Q: Expected behavior

For `opencode-go/kimi-k2.6` on OpenClaw v2026.5.12, replayed assistant messages should be sanitized before being sent to the provider. The request payload should not contain `messages[].reasoning_details` or other unsupported reasoning fields. A local hotfix that strips these fields from `messages[]` / `input[]` prevents the provider from rejecting the request with HTTP 400.

openclaw2026-05-18 23:37:35

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Hi,

I am running OpenClaw v2026.5.12 with the opencode-go/kimi-k2.6 model.

After a few messages, the agent fails with this error:

LLM request failed: provider rejected the request schema or tool payload. 400 Error from provider: Extra inputs are not permitted, field: 'messages[5].reasoning_details'

Example log:

May 18 23:00:33 openclaw 2026-05-18T23:00:33.881+00:00 [agent/embedded] embedded run agent end: runId=... isError=true model=kimi-k2.6 provider=opencode-go error=HTTP 500: In ternal Server Error rawError=500 Internal Server Error May 18 23:00:38 openclaw 2026-05-18T23:00:38.848+00:00 [agent/embedded] embedded run agent end: runId=... isError=true model=kimi-k2.6 provider=opencode-go error=LLM request failed: provider rejected the request schema or tool payload. rawError=400 Error from provider: Extra inputs are not permitted, field: 'messages[5].reasoning_details', value: "..."

I tried creating a new session and setting thinkingDefault to off, but the problem still happened.

From what I found, the installed bundle in v2026.5.12 only contains the DeepSeek wrapper for opencode-go:

export { createOpencodeGoDeepSeekV4Wrapper as t };

It does not include a wrapper to strip unsupported reasoning fields for Kimi models.

The issue seems to be that opencode-go/kimi-k2.6 does not accept reasoning fields in replayed assistant messages, especially:

messages[].reasoning_details messages[].reasoning_content messages[].reasoning messages[].reasoning_text

A local hotfix that solved the problem was to wrap the opencode-go stream function for kimi-k2.5 and kimi-k2.6, and strip reasoning fields both at the payload root and inside messages[] / input[].

Example fix:

function isOpencodeGoKimiNoReasoningModelId(modelId) { return typeof modelId === "string" && ( modelId.trim().toLowerCase() === "kimi-k2.5" || modelId.trim().toLowerCase() === "kimi-k2.6" ); }

function stripReasoningFromMessage(msg) { if (!msg || typeof msg !== "object") return;

delete msg.reasoning_details; delete msg.reasoning_content; delete msg.reasoning; delete msg.reasoning_text;

if (Array.isArray(msg.content)) { for (const part of msg.content) { stripReasoningFromMessage(part); } } }

function stripKimiReasoningPayload(payloadObj) { if (!payloadObj || typeof payloadObj !== "object") return;

delete payloadObj.reasoning; delete payloadObj.reasoning_effort; delete payloadObj.reasoningEffort; delete payloadObj.include;

if (Array.isArray(payloadObj.messages)) { for (const msg of payloadObj.messages) { stripReasoningFromMessage(msg); } }

if (Array.isArray(payloadObj.input)) { for (const msg of payloadObj.input) { stripReasoningFromMessage(msg); } } }

Expected behavior:

opencode-go/kimi-k2.6 should not receive any unsupported reasoning fields in the request payload.

Actual behavior:

OpenClaw sends replayed assistant messages containing reasoning_details, and the provider rejects the request with HTTP 400.

Could a Kimi-specific no-reasoning wrapper be added for opencode-go/kimi-k2.5 and opencode-go/kimi-k2.6, similar to the existing DeepSeek wrapper, but also cleaning reasoning fields inside replayed messages?

Error Message

After a few messages, the agent fails with this error: 400 Error from provider: Extra inputs are not permitted, May 18 23:00:33 openclaw 2026-05-18T23:00:33.881+00:00 [agent/embedded] embedded run agent end: runId=... isError=true model=kimi-k2.6 provider=opencode-go error=HTTP 500: In ternal Server Error rawError=500 Internal Server Error May 18 23:00:38 openclaw 2026-05-18T23:00:38.848+00:00 [agent/embedded] embedded run agent end: runId=... isError=true model=kimi-k2.6 provider=opencode-go error=LLM request failed: provider rejected the request schema or tool payload. rawError=400 Error from provider: Extra inputs are not permitted, field: 'messages[5].reasoning_details', value: "..." error=HTTP 500: Internal Server Error rawError=500 Internal Server Error error=HTTP 500: Internal Server Error error=LLM request failed: provider rejected the request schema or tool payload. The user does not receive an agent reply. OpenClaw surfaces the provider/schema error instead of completing the conversation.

Root Cause