diff --git a/dist/providers/openai-completions.js b/dist/providers/openai-completions.js
index c4b291d86ce40b2df319c439263d16d67592d22e..449da02d0d2c85309979e392909df5d3fb2ad083 100644
--- a/dist/providers/openai-completions.js
+++ b/dist/providers/openai-completions.js
@@ -228,7 +228,13 @@ export const streamOpenAICompletions = (model, context, options) => {
                     }
                     const reasoningDetails = choice.delta.reasoning_details;
                     if (reasoningDetails && Array.isArray(reasoningDetails)) {
+                        // Store ALL reasoning_details for OpenRouter compatibility (not just encrypted)
+                        if (!output._rawReasoningDetails) {
+                            output._rawReasoningDetails = [];
+                        }
                         for (const detail of reasoningDetails) {
+                            output._rawReasoningDetails.push(detail);
+                            // Also handle encrypted type tied to tool calls (existing behavior)
                             if (detail.type === "reasoning.encrypted" && detail.id && detail.data) {
                                 const matchingToolCall = output.content.find((b) => b.type === "toolCall" && b.id === detail.id);
                                 if (matchingToolCall) {
@@ -500,19 +506,27 @@ function convertMessages(model, context, compat) {
                         arguments: JSON.stringify(tc.arguments),
                     },
                 }));
-                const reasoningDetails = toolCalls
-                    .filter((tc) => tc.thoughtSignature)
-                    .map((tc) => {
-                    try {
-                        return JSON.parse(tc.thoughtSignature);
-                    }
-                    catch {
-                        return null;
+                // First check for raw reasoning_details stored on the message (OpenRouter models like Kimi)
+                const rawDetails = msg._rawReasoningDetails;
+                if (rawDetails && Array.isArray(rawDetails) && rawDetails.length > 0) {
+                    assistantMsg.reasoning_details = rawDetails;
+                }
+                else {
+                    // Fall back to extracting from tool call thoughtSignatures (encrypted type)
+                    const reasoningDetails = toolCalls
+                        .filter((tc) => tc.thoughtSignature)
+                        .map((tc) => {
+                        try {
+                            return JSON.parse(tc.thoughtSignature);
+                        }
+                        catch {
+                            return null;
+                        }
+                    })
+                        .filter(Boolean);
+                    if (reasoningDetails.length > 0) {
+                        assistantMsg.reasoning_details = reasoningDetails;
                     }
-                })
-                    .filter(Boolean);
-                if (reasoningDetails.length > 0) {
-                    assistantMsg.reasoning_details = reasoningDetails;
                 }
             }
             // Skip assistant messages that have no content and no tool calls.