Tool call · 5 checks · max 400 tokens · benched 2026-09-16
xAI models side by side on "Pick the right tool of three": Grok 4.3 scores 10/10; Grok 4.3 is the cheapest answer scoring 8+ at $0.71 per 1,000 runs. Outputs, checks, judge reasons, latency and cost.
System
You are a function-calling engine. Reply with JSON only, no prose, no code fences.
User
You have three tools:
1. {"name": "search_docs", "parameters": {"query": "string"}}
2. {"name": "create_ticket", "parameters": {"subject": "string", "body": "string"}}
3. {"name": "get_order_status", "parameters": {"order_id": "string"}}
Choose exactly one tool for the user message and produce the call as a JSON object of the shape {"name": string, "arguments": object}.
User: Where is my order A1029? It was supposed to arrive yesterday.Rubric for the judge: Selects get_order_status with order_id A1029 and nothing else; does not open a ticket or search docs.
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
351 in · 98 out (75 reasoning) · 5 words · checks 5/5
{"name": "get_order_status", "arguments": {"order_id": "A1029"}}Judge: Output correctly selects get_order_status with order_id A1029 in proper JSON format, matching the rubric requirements exactly.
x-ai/grok-4.5
351 in · 48 out (25 reasoning) · 5 words · checks 5/5
{"name": "get_order_status", "arguments": {"order_id": "A1029"}}Judge: Output correctly selects get_order_status with order_id A1029 in proper JSON format, matching the rubric requirements exactly.
x-ai/grok-4.20
323 in · 183 out (163 reasoning) · 5 words · checks 5/5
{"name": "get_order_status", "arguments": {"order_id": "A1029"}}Judge: Output correctly selects get_order_status with order_id A1029 in proper JSON format, matching the rubric requirements exactly.
x-ai/grok-4.3
329 in · 201 out (177 reasoning) · 7 words · checks 5/5
{
"name": "get_order_status",
"arguments": {"order_id": "A1029"}
}Judge: Output correctly selects get_order_status tool with the exact order_id parameter A1029, matches the required JSON format precisely, and avoids unnecessary tools or commentary.
Tool call: Selects get_order_status with order_id A1029 and nothing else; does not open a ticket or search docs. The deterministic checks are json_valid, json_keys, regex, regex, not_contains.
If the judge's bar of 8/10 is good enough for you, Grok 4.3 at $0.71 per 1,000 runs. If you need the top score, Grok 4.3 at $0.71 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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