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Update context window after model switch (#11520)

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- Update token usage aggregation to refresh model context window after a
model change.
- Add protocol/core tests, including an e2e model-switch test that
validates switching to a smaller model updates telemetry.
This commit is contained in:
Ahmed Ibrahim
2026-02-11 17:41:23 -08:00
committed by GitHub
parent 40de788c4d
commit 95fb86810f
3 changed files with 290 additions and 4 deletions
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26
codex-rs/core/src/codex.rs
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@@ -2499,8 +2499,8 @@ impl Session {
total_tokens: estimated_total_tokens.max(0),
};
if info.model_context_window.is_none() {
info.model_context_window = turn_context.model_context_window();
if let Some(model_context_window) = turn_context.model_context_window() {
info.model_context_window = Some(model_context_window);
}
state.set_token_info(Some(info));
@@ -5827,6 +5827,28 @@ mod tests {
assert_eq!(actual_tokens, expected_tokens.max(0));
}
#[tokio::test]
async fn recompute_token_usage_updates_model_context_window() {
let (session, mut turn_context) = make_session_and_context().await;
{
let mut state = session.state.lock().await;
state.set_token_info(Some(TokenUsageInfo {
total_token_usage: TokenUsage::default(),
last_token_usage: TokenUsage::default(),
model_context_window: Some(258_400),
}));
}
turn_context.model_info.context_window = Some(128_000);
turn_context.model_info.effective_context_window_percent = 100;
session.recompute_token_usage(&turn_context).await;
let actual = session.state.lock().await.token_info().expect("token info");
assert_eq!(actual.model_context_window, Some(128_000));
}
#[tokio::test]
async fn record_initial_history_reconstructs_forked_transcript() {
let (session, turn_context) = make_session_and_context().await;