Godot 4 answers, verified

Claude Haiku 4.5 wrote GDScript for 15 Godot 4 tasks and each was run headless on Godot 4.7.2: 11 passed on the first try, 14 after one fix. The code, the errors and the checks.

Claude Opus 5.5 wrote GDScript for 15 Godot 4 tasks and each was run headless on Godot 4.7.2: 15 passed on the first try, 15 after one fix. The code, the errors and the checks.

Claude Sonnet 5.5 wrote GDScript for 15 Godot 4 tasks and each was run headless on Godot 4.7.2: 15 passed on the first try, 15 after one fix. The code, the errors and the checks.

GPT-6.1 Sol wrote GDScript for 15 Godot 4 tasks and each was run headless on Godot 4.7.2: 15 passed on the first try, 15 after one fix. The code, the errors and the checks.

Godot's own language is GDScript, not Python. Python code Godot rejects, the same thing in GDScript, and what Godot 4.7.2 printed for both.

13 new classes, 529 new methods, properties, signals and constants, 54 removed and 186 deprecated between Godot 4.6 and 4.7, from Godot's own class reference.

Godot 4 has no yield. Await a timer's timeout signal instead: the parse error a Godot 3 wait hits, the working version, and what Godot 4.7.2 printed for both.

Godot 4 prints this when the variable before the dot holds Nil. A script that causes it, the fix, and what Godot 4.7.2 printed for both.

Godot 4 prints this when a node reference points at nothing, usually a $Path or get_node that found no node. The repro, the fix, and Godot 4.7.2's output.

Godot 4 prints this when your variable still points at a node that was freed. A script that causes it, the is_instance_valid fix, and Godot 4.7.2's output.

Godot 4 prints this when you set a property on a variable that holds Nil. A script that causes it, the fix, and what Godot 4.7.2 printed for both.

A function was called with fewer or more arguments than it takes. What Godot 4.7.2 checks, the fix, and what it printed for both, verbatim.

Godot 4 renamed PackedScene.instance() to instantiate(). The error a Godot 3 call hits, the fix, and what Godot 4.7.2 printed for both.

A static function got an argument of the wrong Variant type. What Godot 4.7.2 checks, the fix, and what it printed for both, verbatim.

Godot 4 renamed KinematicBody2D to CharacterBody2D and move_and_slide() now takes no arguments. The error a Godot 3 script hits, the fix, and Godot 4.7.2's output.

Godot 4 removed setget. A Godot 3 setget line fails with Expected end of statement after variable declaration. Both Godot 4 forms, inline and named, run on Godot 4.7.2.

Godot 4 renamed Spatial to Node3D and its translation to position. The parse error a Godot 3 3D script hits, the fix, and what Godot 4.7.2 printed for both.

Godot 4 replaced export var and export(...) with annotations. The parse error a Godot 3 script hits, and every export hint as its Godot 4 annotation, run on Godot 4.7.2.

Godot 4 replaced onready var with the @onready annotation. The parse error a Godot 3 script hits, the fix, and what Godot 4.7.2 printed for both.

Godot 4 replaced the tool keyword with the @tool annotation and Engine.editor_hint with Engine.is_editor_hint(). The parse error, the fix, and Godot 4.7.2's output.

A variable typed with a script class got a String, int or other non-object value. What Godot 4.7.2 checks, the fix, and what it printed for both.

A function that uses await was called and its return value used without await. What Godot 4.7.2 checks, the fix, and what it printed for both, verbatim.