Summarise · 3 checks · max 400 tokens · benched 2026-09-16
xAI models side by side on "One-sentence changelog summary": Grok 4.5 scores 9/10; Grok 4.5 is the cheapest answer scoring 8+ at $1.39 per 1,000 runs. Outputs, checks, judge reasons, latency and cost.
User
Summarise this release note in one sentence of at most 30 words. Output only the sentence. Release 4.7.0: The public API now enforces a rate limit of 600 requests per minute per key (previously unlimited). Requests over the limit return HTTP 429 with a Retry-After header. Webhook deliveries are now signed with HMAC-SHA256 and the old unsigned mode will be removed in 4.9. We also fixed a bug where exporting more than 10,000 rows produced an empty file.
Rubric for the judge: A single accurate sentence that prioritises the rate limit and signed webhooks; no bullet list, no preamble.
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
314 in · 494 out (452 reasoning) · 23 words · checks 2/3
Release 4.7.0 adds a 600 req/min API rate limit returning 429, HMAC-SHA256 webhook signing (unsigned removed in 4.9), and fixes empty large exports.
Judge: Accurate single sentence under 30 words (27), prioritizes rate limit and webhook signing as required, no preamble or bullets, though 'req/min' abbreviation is slightly informal.
x-ai/grok-4.5
314 in · 163 out (133 reasoning) · 16 words · checks 2/3
Release 4.7.0 adds API rate limits (600 req/min), HMAC-SHA256 webhook signatures, and fixes large export bugs.
Judge: Accurate single sentence under 30 words (16 words), prioritizes rate limits and signed webhooks as required, no preamble or bullets, though 'large export bugs' is slightly less precise than 'exporting >10,000 rows produced empty file'.
x-ai/grok-4.20
294 in · 571 out (531 reasoning) · 22 words · checks 2/3
Release 4.7.0 adds 600/min API rate limits with 429 errors, HMAC-SHA256 webhook signatures, and a fix for empty exports over 10,000 rows.
Judge: Accurate single sentence under 30 words (24 words), prioritizes rate limits and signed webhooks as required, no preamble or bullet list, minor: could emphasize deprecation of unsigned mode more explicitly.
x-ai/grok-4.3
300 in · 565 out (525 reasoning) · 21 words · checks 2/3
Release 4.7.0 adds a 600 req/min API rate limit (with 429 responses), HMAC-SHA256 webhook signing, and fixes the >10k-row export bug.
Judge: Accurate single sentence under 30 words (24 words), prioritizes rate limit and webhook signing as required, no preamble or bullets, though could have been slightly more explicit about the Retry-After header.
Summarise: A single accurate sentence that prioritises the rate limit and signed webhooks; no bullet list, no preamble. The deterministic checks are max_words, contains, regex.
If the judge's bar of 8/10 is good enough for you, Grok 4.5 at $1.39 per 1,000 runs. If you need the top score, Grok 4.5 at $1.39 per 1,000 runs.
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