Reasoning · 1 checks · max 800 tokens · benched 2026-09-16
Mistral AI models side by side on "When does the faster train catch up?": Mistral Large 3 2512 scores 10/10; Mistral Large 3 2512 is the cheapest answer scoring 8+ at $0.06 per 1,000 runs. Outputs, checks, judge reasons, latency and cost.
System
Think carefully, then give only the final answer in the requested format.
User
Train A leaves a station at 09:10 travelling at a constant 80 km/h. Train B leaves the same station on the same track at 09:40 travelling at a constant 120 km/h in the same direction. How many minutes after 09:10 does train B catch up with train A? Reply with only the whole number of minutes.
Rubric for the judge: The single correct answer 90, with no working shown in the final output.
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.
mistralai/mistral-large-2512
101 in · 3 out · 1 words · checks 1/1
90
Judge: The output is exactly '90' with no extraneous commentary, matching the rubric requirement perfectly.
mistralai/mistral-medium-3-5
113 in · 628 out (450 reasoning) · 1 words · checks 1/1
90
Judge: The output is exactly '90' with no extraneous commentary, matching the rubric requirement perfectly.
mistralai/mistral-small-2603
113 in · 746 out (550 reasoning) · 1 words · checks 1/1
90
Judge: The output is exactly '90' with no extraneous commentary, matching the rubric requirement perfectly.
mistralai/ministral-8b-2512
101 in · 3 out · 1 words · checks 0/1
13
Judge: The output of 13 minutes is incorrect; the correct answer is 90 minutes, calculated from Train A's 30-minute head start (30 km distance) divided by the 40 km/h speed difference between the trains.
Reasoning: The single correct answer 90, with no working shown in the final output. The deterministic checks are exact.
If the judge's bar of 8/10 is good enough for you, Mistral Large 3 2512 at $0.06 per 1,000 runs. If you need the top score, Mistral Large 3 2512 at $0.06 per 1,000 runs.
Run it yourself
Re-run this prompt on Mistral AI with your own OpenRouter key, or tweak the wording and see what changes.
More Mistral AI prompts
If our calculators helped you cut down on hidden AI wallet leaks, thanks for using them. A tiny fraction of your savings is what keeps our pricing indexes updated daily.
Not sure which AI is cheapest for your use case? Find out in 30 seconds — no signup required.
AI cost intelligence
Join the OverpayingForAI list for pricing updates, cheaper alternatives, and practical buying guidance.
Now tracking 50+ AI tools, models, platforms, subscriptions, coding tools, and automation products.