Can LongCat 2.0 write working Godot 4 code? 11 of 15 on the first try

How the test works

LongCat 2.0 in Flockbay

Move a CharacterBody2D with an input action: pass

extends CharacterBody2D

func _physics_process(delta: float) -> void:
	if Input.is_action_pressed("ui_right"):
		velocity.x = 200.0
	else:
		velocity.x = 0.0
	move_and_slide()

Fall with gravity and land on the floor: pass

extends CharacterBody2D

const GRAVITY = 980.0

func _physics_process(delta):
	velocity.y += GRAVITY * delta
	move_and_slide()
	if is_on_floor():
		velocity.y = 0

A score label: pass

extends Label

var _score: int = 0

func _ready() -> void:
	text = "Score: %d" % _score

func add(points: int) -> void:
	_score += points
	text = "Score: %d" % _score

Save and load a dictionary as JSON: pass

extends RefCounted

## Saves a Dictionary to a file as JSON.
## [param data] The dictionary to serialize.
## [param path] The file path (e.g., "user://save_game.save").
static func save_data(data: Dictionary, path: String) -> void:
    var file = FileAccess.open(path, FileAccess.WRITE)
    if file == null:
        push_error("Failed to open file for writing: " + path)
        return
    file.store_string(JSON.stringify(data))
    file.close()

## Loads a Dictionary from a JSON file.
## Returns an empty Dictionary if the file doesn't exist or parsing fails.
## [param path] The file path to read from.
## [return] The loaded Dictionary.
static func load_data(path: String) -> Dictionary:
    if not FileAccess.file_exists(path):
        return {}
    var json_string = FileAccess.get_file_as_string(path)
    var parsed = JSON.parse_string(json_string)
    if parsed is Dictionary:
        return parsed
    push_error("Failed to parse JSON from: " + path)
    return {}

Health with signals: pass after one fix

Godot Engine v4.7.2.stable.mono.official.ed1daf0bf - https://godotengine.org

BENCH FAIL: died emitted 2 times

Fade out with a tween: pass

extends Node2D

signal faded

func fade_out(duration: float) -> void:
	modulate.a = 1.0
	var tween = create_tween()
	tween.tween_property(self, "modulate:a", 0.0, duration)
	tween.tween_callback(emit_signal.bind("faded"))

Spawn on a timer, then stop: pass

extends Node

var spawned_count: int = 0

func _ready() -> void:
	var timer := Timer.new()
	timer.wait_time = 0.25
	timer.timeout.connect(_on_timer_timeout)
	add_child(timer)
	timer.start()

func _on_timer_timeout() -> void:
	var node := Node2D.new()
	add_child(node)
	spawned_count += 1
	if spawned_count >= 4:
		for child in get_children():
			if child is Timer:
				child.stop()

A door with states: pass

extends Node

enum State { CLOSED, OPENING, OPEN }

var state: State = State.CLOSED
var _open_timer: Timer = null

func _ready() -> void:
	_open_timer = Timer.new()
	_open_timer.one_shot = true
	_open_timer.wait_time = 0.5
	_open_timer.timeout.connect(_on_open_timer_timeout)
	add_child(_open_timer)

func interact() -> void:
	if state == State.CLOSED:
		state = State.OPENING
		_open_timer.start()

func get_state_name() -> String:
	match state:
		State.CLOSED:
			return "CLOSED"
		State.OPENING:
			return "OPENING"
		State.OPEN:
			return "OPEN"
	return ""

func _on_open_timer_timeout() -> void:
	if state == State.OPENING:
		state = State.OPEN

An inventory with counts: pass

extends RefCounted

var _items: Dictionary = {}

func add_item(item_name: String, count: int) -> void:
	if count <= 0:
		return
	if _items.has(item_name):
		_items[item_name] += count
	else:
		_items[item_name] = count

func remove_item(item_name: String, count: int) -> bool:
	if count <= 0:
		return true
	if not _items.has(item_name):
		return false
	if _items[item_name] < count:
		return false
	_items[item_name] -= count
	if _items[item_name] == 0:
		_items.erase(item_name)
	return true

func get_count(item_name: String) -> int:
	return _items.get(item_name, 0)

Load a level scene from a path: pass

extends Node

func load_level(path: String) -> Node:
	var packed_scene = load(path) as PackedScene
	if packed_scene == null:
		push_error("Failed to load scene at path: " + path)
		return null
	var instance = packed_scene.instantiate()
	add_child(instance)
	return instance

Paint cells on a TileMapLayer: pass

extends TileMapLayer

func paint_row(y: int, from_x: int, to_x: int) -> void:
	var start_x := mini(from_x, to_x)
	var end_x := maxi(from_x, to_x)
	for x in range(start_x, end_x + 1):
		set_cell(Vector2i(x, y), 0, Vector2i(0, 0))

func is_painted(cell: Vector2i) -> bool:
	return get_cell_source_id(cell) != -1

Cast a physics ray: pass

extends Node2D

func first_hit(from: Vector2, to: Vector2) -> Vector2:
	var space_state = get_world_2d().direct_space_state
	var query = PhysicsRayQueryParameters2D.create(from, to)
	var result = space_state.intersect_ray(query)
	if result:
		return result.position
	return to

A path on a grid around walls: pass after one fix

Godot Engine v4.7.2.stable.mono.official.ed1daf0bf - https://godotengine.org

SCRIPT ERROR: Parse Error: Standalone lambdas cannot be accessed. Consider assigning it to a variable.
   at: GDScript::reload (res://path_finder.gd:16)
   GDScript backtrace (most recent call first):
       [0] _ready (res://bench_check.gd:4)
ERROR: Failed to load script "res://path_finder.gd" with error "Parse error".
   at: load (modules/gdscript/gdscript_resource_format.cpp:46)
   GDScript backtrace (most recent call first):
       [0] _ready (res://bench_check.gd:4)
SCRIPT ERROR: Invalid call. Nonexistent function 'new' in base 'GDScript'.
   at: _ready (res://bench_check.gd:9)
   GDScript backtrace (most recent call first):
       [0] _ready (res://bench_check.gd:9)

Build and play an animation in code: fail

Godot Engine v4.7.2.stable.mono.official.ed1daf0bf - https://godotengine.org

SCRIPT ERROR: Parse Error: Cannot find member "INTERPOLATION_CONSTANT" in base "Animation".
   at: GDScript::reload (res://blinker.gd:13)
   GDScript backtrace (most recent call first):
       [0] _ready (res://bench_check.gd:4)
ERROR: Failed to load script "res://blinker.gd" with error "Parse error".
   at: load (modules/gdscript/gdscript_resource_format.cpp:46)
   GDScript backtrace (most recent call first):
       [0] _ready (res://bench_check.gd:4)
BENCH FAIL: visible at 0.25, 0.75, 1.25 and 1.75 s was [true, true, true, true], expected [true, false, true, false]

Wait for a signal or a timeout: fail

Godot Engine v4.7.2.stable.mono.official.ed1daf0bf - https://godotengine.org

ERROR: Parameter "obj" is null.
   at: connect (core/variant/callable.cpp:545)
   GDScript backtrace (most recent call first):
       [0] wait_for (res://waiter.gd:12)
       [1] _ready (res://bench_check.gd:13)
SCRIPT ERROR: Error connecting to signal:  during await.
   at: wait_for (res://waiter.gd:12)
   GDScript backtrace (most recent call first):
       [0] wait_for (res://waiter.gd:12)
       [1] _ready (res://bench_check.gd:13)
ERROR: Parameter "obj" is null.
   at: connect (core/variant/callable.cpp:545)
   GDScript backtrace (most recent call first):
       [0] wait_for (res://waiter.gd:12)
       [1] _ready (res://bench_check.gd:17)
SCRIPT ERROR: Error connecting to signal:  during await.
   at: wait_for (res://waiter.gd:12)
   GDScript backtrace (most recent call first):
       [0] wait_for (res://waiter.gd:12)
       [1] _ready (res://bench_check.gd:17)
BENCH FAIL: returned false for a signal 0.2 s away with a 1 s timeout