Code fix · 3 checks · max 600 tokens · benched 2026-09-16
xAI models side by side on "Fix a missing await in JavaScript": Grok 4.3 scores 10/10; Grok 4.3 is the cheapest answer scoring 8+ at $0.66 per 1,000 runs. Outputs, checks, judge reasons, latency and cost.
System
You are a senior engineer. Reply with code only unless asked otherwise.
User
getName() always returns undefined. fetchUser(id) returns a Promise that resolves to an object with a name property. Fix the bug and return the complete corrected function only, keeping the same function name and signature.
async function getName(id) {
const user = fetchUser(id);
return user.name;
}Rubric for the judge: Adds await to fetchUser, keeps the async signature, returns the name; no unrelated rewrites.
Every cell is one OpenRouter call at temperature 0 with the prompt's token cap and reasoning effort "low" where the model supports it. Cost is usage × the catalogue rate in models.json. Quality is one judge call to anthropic/claude-haiku-4.5 against the prompt's rubric, cached per prompt version.
x-ai/grok-4.6
290 in · 180 out (156 reasoning) · 12 words · checks 3/3
async function getName(id) {
const user = await fetchUser(id);
return user.name;
}Judge: Output correctly adds await to resolve the Promise, maintains async function signature, returns user.name, and provides only the corrected function without extra commentary.
x-ai/grok-4.5
290 in · 88 out (64 reasoning) · 12 words · checks 3/3
async function getName(id) {
const user = await fetchUser(id);
return user.name;
}Judge: Output correctly adds await to resolve the Promise, maintains async function signature, returns user.name, and provides only the corrected function without extra commentary.
x-ai/grok-4.20
267 in · 433 out (411 reasoning) · 12 words · checks 3/3
async function getName(id) {
const user = await fetchUser(id);
return user.name;
}Judge: Output correctly adds await to resolve the Promise, maintains async function signature, returns user.name, and provides only the corrected function without extra commentary.
x-ai/grok-4.3
273 in · 208 out (186 reasoning) · 12 words · checks 3/3
async function getName(id) {
const user = await fetchUser(id);
return user.name;
}Judge: Output correctly adds await to resolve the Promise, maintains async function signature, returns user.name, and provides only the corrected function without extra commentary.
Code fix: Adds await to fetchUser, keeps the async signature, returns the name; no unrelated rewrites. The deterministic checks are contains, regex, contains.
If the judge's bar of 8/10 is good enough for you, Grok 4.3 at $0.66 per 1,000 runs. If you need the top score, Grok 4.3 at $0.66 per 1,000 runs.
Run it yourself
Re-run this prompt on xAI with your own OpenRouter key, or tweak the wording and see what changes.
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