diff --git a/codex-rs/Cargo.lock b/codex-rs/Cargo.lock
index ce11e14fb1..2bd379252a 100644
--- a/codex-rs/Cargo.lock
+++ b/codex-rs/Cargo.lock
@@ -1993,7 +1993,6 @@ dependencies = [
  "codex-utils-absolute-path",
  "codex-utils-cargo-bin",
  "pretty_assertions",
- "serde_json",
  "similar",
  "tempfile",
  "thiserror 2.0.18",
diff --git a/codex-rs/apply-patch/Cargo.toml b/codex-rs/apply-patch/Cargo.toml
index 8db595eedb..ba4fa5e48e 100644
--- a/codex-rs/apply-patch/Cargo.toml
+++ b/codex-rs/apply-patch/Cargo.toml
@@ -30,5 +30,4 @@ assert_cmd = { workspace = true }
 assert_matches = { workspace = true }
 codex-utils-cargo-bin = { workspace = true }
 pretty_assertions = { workspace = true }
-serde_json = { workspace = true }
 tempfile = { workspace = true }
diff --git a/codex-rs/apply-patch/examples/compare_streaming_parser.rs b/codex-rs/apply-patch/examples/compare_streaming_parser.rs
deleted file mode 100644
index 2b3e641e47..0000000000
--- a/codex-rs/apply-patch/examples/compare_streaming_parser.rs
+++ /dev/null
@@ -1,124 +0,0 @@
-use std::fs::File;
-use std::io::BufRead;
-use std::io::BufReader;
-
-use codex_apply_patch::Hunk;
-use codex_apply_patch::StreamingPatchParser;
-use codex_apply_patch::parse_patch;
-use serde_json::Value;
-
-#[derive(Debug)]
-enum ParseOutcome {
-    Ok(Vec<Hunk>),
-    Err(String),
-}
-
-fn normal_parse(patch: &str) -> ParseOutcome {
-    parse_patch(patch)
-        .map(|args| ParseOutcome::Ok(args.hunks))
-        .unwrap_or_else(|err| ParseOutcome::Err(err.to_string()))
-}
-
-fn streaming_parse(patch: &str) -> ParseOutcome {
-    let mut parser = StreamingPatchParser::default();
-    parser
-        .push_delta(patch)
-        .and_then(|_| parser.finish())
-        .map(ParseOutcome::Ok)
-        .unwrap_or_else(|err| ParseOutcome::Err(err.to_string()))
-}
-
-fn mismatch_kind(normal: &ParseOutcome, streaming: &ParseOutcome) -> Option<&'static str> {
-    match (normal, streaming) {
-        (ParseOutcome::Ok(normal), ParseOutcome::Ok(streaming)) if normal == streaming => None,
-        (ParseOutcome::Err(normal), ParseOutcome::Err(streaming)) if normal == streaming => None,
-        (ParseOutcome::Ok(_), ParseOutcome::Err(_)) => Some("Old OK, new error"),
-        (ParseOutcome::Err(_), ParseOutcome::Ok(_)) => Some("Old error, new OK"),
-        (ParseOutcome::Ok(_), ParseOutcome::Ok(_)) => Some("Both OK, different parse"),
-        (ParseOutcome::Err(_), ParseOutcome::Err(_)) => Some("Both error, different error"),
-    }
-}
-
-fn decode_patch(raw: &str) -> String {
-    if raw.contains("\\n") {
-        let wrapped = format!("\"{raw}\"");
-        if let Ok(decoded) = serde_json::from_str::<String>(&wrapped) {
-            return decoded;
-        }
-    }
-    if raw.starts_with('"')
-        && let Ok(decoded) = serde_json::from_str::<String>(raw)
-    {
-        return decoded;
-    }
-    raw.to_string()
-}
-
-fn summarize_patch(patch: &str) -> String {
-    let mut out = String::new();
-    for (i, line) in patch.lines().take(80).enumerate() {
-        out.push_str(&format!("{:>4}: {line}\n", i + 1));
-    }
-    if patch.lines().count() > 80 {
-        out.push_str("... truncated after 80 lines ...\n");
-    }
-    out
-}
-
-fn main() {
-    let mut args = std::env::args().skip(1);
-    let path = args
-        .next()
-        .expect("usage: compare_streaming_parser <jsonl> [start_line]");
-    let start_line = args
-        .next()
-        .map(|line| line.parse::<usize>().expect("start_line must be a number"))
-        .unwrap_or(1);
-    let file = File::open(&path).expect("failed to open jsonl");
-    let reader = BufReader::new(file);
-
-    let mut total = 0usize;
-    let mut both_error = 0usize;
-    for line in reader.lines() {
-        total += 1;
-        if total < start_line {
-            continue;
-        }
-        let line = line.expect("failed to read line");
-        let value: Value = serde_json::from_str(&line).expect("invalid jsonl row");
-        let request_id = value
-            .get("request_id")
-            .and_then(Value::as_str)
-            .unwrap_or("<missing request_id>");
-        let raw = value
-            .get("patch_payload_escaped")
-            .and_then(Value::as_str)
-            .unwrap_or("");
-        let patch = decode_patch(raw);
-
-        let normal = normal_parse(&patch);
-        let streaming = streaming_parse(&patch);
-        if let Some(kind) = mismatch_kind(&normal, &streaming) {
-            println!("first mismatch at row {total}");
-            println!("result: {kind}");
-            println!("request_id: {request_id}");
-            println!("raw payload bytes: {}", raw.len());
-            println!("decoded patch bytes: {}", patch.len());
-            println!("\nnormal parser:\n{normal:#?}");
-            println!("\nstreaming parser:\n{streaming:#?}");
-            println!("\npatch preview:\n{}", summarize_patch(&patch));
-            return;
-        }
-        if matches!(normal, ParseOutcome::Err(_)) {
-            both_error += 1;
-        }
-        if total % 10_000 == 0 {
-            eprintln!("checked {total} rows ({both_error} rows where both parsers errored)");
-        }
-    }
-
-    println!("checked all {total} rows; no parser result mismatches");
-    if both_error > 0 {
-        println!("{both_error} rows produced an error in both parsers");
-    }
-}