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[codex] Update realtime V2 VAD silence delay and 1.5 prompt (#18092)

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## Summary

- set the realtime v2 server VAD silence delay to 500ms
- update the default realtime 1.5 backend prompt to the v4 text
- keep the session payload and prompt rendering tests aligned with those
changes

## Why

- the VAD change gives the voice path a longer pause before ending the
user's turn
- the prompt change makes the default bundled realtime prompt match the
current v4 content

## Validation

- `cargo +1.93.0 test -p codex-core realtime_prompt --manifest-path
/tmp/codex-realtime-v2-vad-prompt-v4/codex-rs/Cargo.toml`
- `CARGO_TARGET_DIR=/tmp/codex-pr-v4-target cargo +1.93.0 test -p
codex-api
realtime_v2_session_update_includes_background_agent_tool_and_handoff_output_item
--manifest-path
/tmp/codex-realtime-v2-vad-prompt-v4/codex-rs/Cargo.toml`
- `CARGO_TARGET_DIR=/tmp/codex-pr-v4-target cargo +1.93.0 test -p
codex-app-server --test all
'suite::v2::realtime_conversation::realtime_webrtc_start_emits_sdp_notification'
--manifest-path /tmp/codex-realtime-v2-vad-prompt-v4/codex-rs/Cargo.toml
-- --exact`
This commit is contained in:
bxie-openai
2026-04-16 14:30:57 -07:00
committed by GitHub
parent d9c71d41a9
commit 6a1ddfc366
6 changed files with 49 additions and 44 deletions
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codex-rs/core/src/realtime_prompt.rs
+2 -1
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@@ -74,7 +74,8 @@ mod tests {
let prompt =
prepare_realtime_backend_prompt(/*prompt*/ None, /*config_prompt*/ None);
assert!(prompt.starts_with("You are Codex, an OpenAI Coding Agent"));
assert!(prompt.starts_with("## Identity, tone, and role"));
assert!(prompt.contains("You are Codex, an OpenAI general-purpose agentic assistant"));
assert!(prompt.contains("The user's name is "));
assert!(!prompt.contains("{{ user_first_name }}"));
}