fix anthropic thinking effort json placement

1 files changed, 5 insertions, 1 deletions

diff --git a/libpanto/src/provider_openai_chat.zig b/libpanto/src/provider_openai_chat.zig
index 8319d9d..5152d3e 100644
--- a/libpanto/src/provider_openai_chat.zig
+++ b/libpanto/src/provider_openai_chat.zig
@@ -140,6 +140,10 @@ pub const OpenAIChatRequest = struct {
         rr.response = try rr.req.receiveHead(&redirect_buf);
 
         if (@intFromEnum(rr.response.head.status) >= 400) {
+            // `head.bytes` (which `iterateHeaders` walks) points into the
+            // connection read buffer and is invalidated the moment the body
+            // stream is initialized below. Capture Retry-After first.
+            const retry_after_ms = provider_mod.retryAfterFromHead(rr.response.head);
             // Drain body for diagnostics.
             const body_reader = rr.response.reader(&rr.transfer_buf);
             var err_buf: std.ArrayList(u8) = .empty;
@@ -159,7 +163,7 @@ pub const OpenAIChatRequest = struct {
             const classified = provider_mod.classifyHttpStatus(status, err_buf.items);
             if (self.diag) |d| {
                 d.status_code = status;
-                d.retry_after_ms = provider_mod.retryAfterFromHead(rr.response.head);
+                d.retry_after_ms = retry_after_ms;
             }
             return classified;
         }