diff --git a/frameworks/zix-grpc/Dockerfile b/frameworks/zix-grpc/Dockerfile
index 1d3ed6fa1..0a095f82d 100644
--- a/frameworks/zix-grpc/Dockerfile
+++ b/frameworks/zix-grpc/Dockerfile
@@ -5,7 +5,7 @@ ARG RETRY=6
 ARG TARGETARCH
 ARG RETRY_DELAY=3
 ARG ZIG_VERSION=0.16.0
-ARG ZIX_VERSION=0.4.x
+ARG ZIX_VERSION=0.4.x-rc3
 RUN apk add --no-cache ca-certificates curl git tar xz
 
 RUN set -eu; \
@@ -19,9 +19,9 @@ RUN set -eu; \
     mv "/opt/zig-${ZIG_ARCH}-linux-${ZIG_VERSION}" /opt/zig
 ENV PATH="/opt/zig:${PATH}"
 
-# Vendor zix 0.4.x, separate layer so source-only rebuilds skip the fetch.
+# Vendor zix X.Y.Z, separate layer so source-only rebuilds skip the fetch.
 # The Http1 raw engine work this image needs (large-body drain plus the per-worker
-# response cache used by the /json endpoint) must be present on the 0.4.x branch.
+# response cache used by the /json endpoint) must be present on the X.Y.Z branch.
 # Four ordered attempts before giving up: curl the archive tarball from github then
 # codeberg, then a shallow git clone from github then codeberg. The github archive
 # redirects to codeload.github.com (which the benchmark runner may not resolve), so
diff --git a/frameworks/zix-grpc/meta.json b/frameworks/zix-grpc/meta.json
index 2e090dc69..4aac2379e 100644
--- a/frameworks/zix-grpc/meta.json
+++ b/frameworks/zix-grpc/meta.json
@@ -3,7 +3,7 @@
   "language": "Zig",
   "type": "engine",
   "engine": "zix",
-  "description": "Zig gRPC h2c server using the zix network backend library. Shared-nothing io_uring: each worker owns its own ring and listener, multiplexing streams per connection. Implements GetSum (unary) and StreamSum (server-streaming).",
+  "description": "Zig gRPC server (h2c) on the zix.Grpc engine built on zix.Http2 (no std.http). Shared-nothing by design: each worker owns its own SO_REUSEPORT listener, io_uring completion ring, and connections, with no shared state or locking across cores, multiplexing HTTP/2 streams per connection. Replies use comptime-cached HPACK blocks. Implements GetSum (unary) and StreamSum (server-streaming).",
   "repo": "https://codeberg.org/prothegee/zix",
   "enabled": true,
   "tests": [
diff --git a/frameworks/zix-grpc/src/main.zig b/frameworks/zix-grpc/src/main.zig
index 3923ca3e9..3c8305303 100644
--- a/frameworks/zix-grpc/src/main.zig
+++ b/frameworks/zix-grpc/src/main.zig
@@ -1,5 +1,4 @@
 //! HttpArena: zix-grpc
-//! zix version: 0.4.x
 //!
 //! zix HttpArena gRPC (h2c) entry point.
 //!
diff --git a/site/data/frameworks.json b/site/data/frameworks.json
index 7e9620a6a..4e2ca1dde 100644
--- a/site/data/frameworks.json
+++ b/site/data/frameworks.json
@@ -901,7 +901,7 @@
   },
   "zix-grpc": {
     "dir": "zix-grpc",
-    "description": "Zig gRPC h2c server using the zix network backend library. Shared-nothing io_uring: each worker owns its own ring and listener, multiplexing streams per connection. Implements GetSum (unary) and StreamSum (server-streaming).",
+    "description": "Zig gRPC server (h2c) on the zix.Grpc engine built on zix.Http2 (no std.http). Shared-nothing by design: each worker owns its own SO_REUSEPORT listener, io_uring completion ring, and connections, with no shared state or locking across cores, multiplexing HTTP/2 streams per connection. Replies use comptime-cached HPACK blocks. Implements GetSum (unary) and StreamSum (server-streaming).",
     "repo": "https://codeberg.org/prothegee/zix",
     "type": "engine",
     "engine": "zix"
diff --git a/site/data/stream-grpc-64.json b/site/data/stream-grpc-64.json
index 55b277b75..190dc6588 100644
--- a/site/data/stream-grpc-64.json
+++ b/site/data/stream-grpc-64.json
@@ -59,18 +59,18 @@
   {
     "framework": "zix-grpc",
     "language": "Zig",
-    "rps": 8468000,
-    "avg_latency": "146.13ms",
-    "p99_latency": "385.19ms",
-    "cpu": "37.9%",
-    "memory": "141MiB",
+    "rps": 8504000,
+    "avg_latency": "146.01ms",
+    "p99_latency": "441.82ms",
+    "cpu": "35.6%",
+    "memory": "139MiB",
     "connections": 64,
     "threads": 64,
     "duration": "5s",
     "pipeline": 1,
     "bandwidth": "0",
     "reconnects": 0,
-    "status_2xx": 8468,
+    "status_2xx": 8504,
     "status_3xx": 0,
     "status_4xx": 0,
     "status_5xx": 0
diff --git a/site/data/unary-grpc-1024.json b/site/data/unary-grpc-1024.json
index 7890ca6a0..4b91a19a9 100644
--- a/site/data/unary-grpc-1024.json
+++ b/site/data/unary-grpc-1024.json
@@ -157,18 +157,18 @@
   {
     "framework": "zix-grpc",
     "language": "Zig",
-    "rps": 7122075,
-    "avg_latency": "7.63ms",
-    "p99_latency": "84.09ms",
-    "cpu": "3008.6%",
+    "rps": 6938181,
+    "avg_latency": "8.26ms",
+    "p99_latency": "103.84ms",
+    "cpu": "4092.8%",
     "memory": "1.2GiB",
     "connections": 1024,
     "threads": 64,
     "duration": "5s",
     "pipeline": 1,
-    "bandwidth": "453.67MB/s",
+    "bandwidth": "441.96MB/s",
     "reconnects": 0,
-    "status_2xx": 36037700,
+    "status_2xx": 35107200,
     "status_3xx": 0,
     "status_4xx": 0,
     "status_5xx": 0
diff --git a/site/data/unary-grpc-256.json b/site/data/unary-grpc-256.json
index 51682e375..9cd76f194 100644
--- a/site/data/unary-grpc-256.json
+++ b/site/data/unary-grpc-256.json
@@ -157,18 +157,18 @@
   {
     "framework": "zix-grpc",
     "language": "Zig",
-    "rps": 7239103,
-    "avg_latency": "2.22ms",
-    "p99_latency": "45.43ms",
-    "cpu": "2927.0%",
-    "memory": "394MiB",
+    "rps": 7039761,
+    "avg_latency": "2.43ms",
+    "p99_latency": "25.63ms",
+    "cpu": "3956.5%",
+    "memory": "393MiB",
     "connections": 256,
     "threads": 64,
     "duration": "5s",
     "pipeline": 1,
-    "bandwidth": "457.47MB/s",
+    "bandwidth": "445.76MB/s",
     "reconnects": 0,
-    "status_2xx": 36340300,
+    "status_2xx": 35410000,
     "status_3xx": 0,
     "status_4xx": 0,
     "status_5xx": 0