{ "entity": "mistral-medium-3-5", "entity_type": "model", "category": "Spreadsheets", "suite": "suite-2026-08-tasks/spreadsheets", "model": "mistralai/mistral-medium-3-5", "judges": [ "anthropic/claude-sonnet-5", "google/gemini-3.1-pro-preview", "openai/gpt-5.6-terra" ], "judge_protocol": "judge-2026-08", "anchors": "solo-2026-08-a", "score": 93, "caps": 0, "cost_usd": 0.1303, "started_at": "2026-08-13T09:02:32.216Z", "finished_at": "2026-08-13T09:02:54.665Z", "tasks": [ { "id": "sp1", "name": "Excel formula from a description", "prompt": "In Excel, column A holds order dates and column B holds order values. Write a single formula for cell D1 that totals only the orders placed in the last full calendar month, relative to today's date. Give the formula and one sentence explaining it. Do not use a pivot table or a helper column.", "output": "**Formula:**\n```excel\n=SUMIFS(B:B, A:A, \">=\"&EOMONTH(TODAY(),-2)+1, A:A, \"<=\"&EOMONTH(TODAY(),-1))\n```\n\n**Explanation:**\nThis formula sums the order values in column B where the corresponding dates in column A fall within the last full calendar month (from the 1st day to the last day of the previous month relative to today).", "latency_ms": 1409, "cost": 0.000843, "task_score": 9, "judges": [ { "judge": "anthropic/claude-sonnet-5", "score": 9, "violates": false, "reasoning": "Formula correctly sums last full month using SUMIFS with EOMONTH boundaries, no helper column or pivot table, with concise correct explanation." }, { "judge": "google/gemini-3.1-pro-preview", "score": 10, "violates": false, "reasoning": "The response provides a perfectly accurate Excel formula using SUMIFS and EOMONTH, followed by exactly one clear sentence of explanation, following all constraints perfectly." }, { "judge": "openai/gpt-5.6-terra", "score": 9, "violates": false, "reasoning": "Correctly sums values for dates from the first through last day of the previous calendar month. Minor robustness issue: using <= month-end can exclude records with time values later on the final day." } ] }, { "id": "sp2", "name": "Fix a broken formula", "prompt": "This Excel formula returns #VALUE! : =SUMIF(A:A,\">\"&TODAY()-30,B:B)+VLOOKUP(C1,Sheet2!A:D,5,FALSE). Identify every fault and give the corrected formula. Sheet2 has columns A to D only.", "output": "Let's analyze the formula and identify all the issues:\n\nOriginal formula:\n`=SUMIF(A:A,\">\"&TODAY()-30,B:B)+VLOOKUP(C1,Sheet2!A:D,5,FALSE)`\n\nIssues identified:\n1. **VLOOKUP column index problem**: The table array is Sheet2!A:D (4 columns), but the column index is 5, which is out of range (should be between 1 and 4).\n\n2. **Potential range mismatch**: SUMIF uses full columns (A:A and B:B) which is inefficient and can cause performance issues with large datasets. While not technically an error, it's a best practice to use specific ranges.\n\n3. **No error handling**: If C1 isn't found in Sheet2!A:A, VLOOKUP will return #N/A, which would propagate through the formula.\n\nCorrected formula (assuming you want column D from Sheet2, which is column 4):\n`=SUMIF(A:A,\">\"&TODAY()-30,B:B)+IFERROR(VLOOKUP(C1,Sheet2!A:D,4,FALSE),0)`\n\nIf you actually need a different column from Sheet2, adjust the column index (4) accordingly. The IFERROR function handles cases where the lookup value isn't found by returning 0 instead of an error.\n\nFor better performance with large datasets, consider using specific ranges instead of full columns:\n`=SUMIF(A1:A1000,\">\"&TODAY()-30,B1:B1000)+IFERROR(VLOOKUP(C1,Sheet2!A1:D1000,4,FALSE),0)`", "latency_ms": 4109, "cost": 0.0028785, "task_score": 8, "judges": [ { "judge": "anthropic/claude-sonnet-5", "score": 8, "violates": false, "reasoning": "Correctly identifies the main fault (index 5 out of range) and gives valid corrected formula with reasonable extra suggestions; concise and clear for a non-technical user." }, { "judge": "google/gemini-3.1-pro-preview", "score": 8, "violates": false, "reasoning": "Correctly identifies the primary fault (column index out of bounds) and provides a good corrected formula with IFERROR. Misses explaining why it might return #VALUE! specifically (e.g., VLOOKUP returning text), but still highly useful." }, { "judge": "openai/gpt-5.6-terra", "score": 5, "violates": false, "reasoning": "Correctly spots the out-of-range VLOOKUP index and gives a plausible index 4 fix. However, it treats non-errors as faults, adds unnecessary IFERROR that changes results, and misses that #VALUE! may result if the looked-up value is text when" } ] }, { "id": "sp3", "name": "Clean messy data", "prompt": "These postcodes were typed by hand: 'sw1a1aa', 'SW1A 1AA', ' m1 4wb', 'M14WB', 'ec1v9nr'. Give a single Excel formula that normalises any one of them to standard UK format (uppercase, one space before the final three characters). Assume the raw value is in A2.", "output": "Here's a single Excel formula that will normalize any of the given postcodes to the standard UK format (uppercase with one space before the final three characters):\n\n```excel\n=UPPER(LEFT(SUBSTITUTE(A2,\" \",\"\"),LEN(SUBSTITUTE(A2,\" \",\"\"))-3)&\" \"&RIGHT(SUBSTITUTE(A2,\" \",\"\"),3))\n```\n\nThis formula:\n1. Removes all spaces from the input with `SUBSTITUTE(A2,\" \",\"\")`\n2. Takes all characters except the last 3 with `LEFT(...,LEN(...)-3)`\n3. Adds a space and the last 3 characters with `\" \"&RIGHT(...,3)`\n4. Converts everything to uppercase with `UPPER()`\n\nExamples:\n- 'sw1a1aa' → \"SW1A 1AA\"\n- 'SW1A 1AA' → \"SW1A 1AA\"\n- ' m1 4wb' → \"M1 4WB\"\n- 'M14WB' → \"M14 WB\"\n- 'ec1v9nr' → \"EC1V 9NR\"", "latency_ms": 3220, "cost": 0.0020025, "task_score": 8, "judges": [ { "judge": "anthropic/claude-sonnet-5", "score": 4, "violates": false, "reasoning": "Formula fails on 'M14WB' (gives 'M14 WB' not 'M1 4WB'), and the response's own example admits this incorrect output without correcting it—a clear factual error." }, { "judge": "google/gemini-3.1-pro-preview", "score": 8, "violates": false, "reasoning": "The formula provided is perfectly correct and elegantly solves the problem. However, there is a minor typo in the example outputs ('M14WB' -> 'M14 WB' instead of 'M1 4WB'), though the formula itself works correctly." }, { "judge": "openai/gpt-5.6-terra", "score": 10, "violates": false, "reasoning": "The formula correctly removes spaces, uppercases the value, and inserts exactly one space before the final three characters for all supplied examples. It provides a single valid Excel formula and clear verification." } ] }, { "id": "sp4", "name": "Choose the right chart", "prompt": "A shop has 14 months of weekly revenue and wants to see whether sales are seasonal. In under 90 words, say which chart to build, which fields go on which axis, and one thing this chart will NOT tell them.", "output": "Use a **line chart** to visualize weekly revenue over time. Place **time (weeks)** on the **x-axis** and **revenue** on the **y-axis**. This will reveal trends, peaks, or dips indicating seasonality.\n\n**Limitation:** The chart won’t explain *why* sales fluctuate (e.g., holidays, promotions). It only shows *when* changes occur.", "latency_ms": 2036, "cost": 0.0007185, "task_score": 10, "judges": [ { "judge": "anthropic/claude-sonnet-5", "score": 8, "violates": false, "reasoning": "Correct, clear, meets word limit, addresses chart type, axes, and limitation concisely; well within instructions for non-technical audience." }, { "judge": "google/gemini-3.1-pro-preview", "score": 10, "violates": false, "reasoning": "The response perfectly follows all instructions, providing the correct chart type, axis assignments, and a valid limitation, all well within the 90-word limit. It is clear, concise, and highly useful." }, { "judge": "openai/gpt-5.6-terra", "score": 10, "violates": false, "reasoning": "Correctly recommends a line chart with weeks on the x-axis and revenue on the y-axis, and gives a valid limitation: it cannot explain causes of fluctuations. It is concise, clear, and under 90 words." } ] }, { "id": "sp5", "name": "Google Sheets QUERY", "prompt": "In Google Sheets, tab 'Sales' has headers in row 1: Date, Rep, Region, Amount. Write one QUERY() formula returning total Amount per Rep for the North region only, sorted highest first. Return only the formula.", "output": "```excel\n=QUERY(Sales!A1:D, \"SELECT B, SUM(D) WHERE C = 'North' GROUP BY B ORDER BY SUM(D) DESC LABEL SUM(D) ''\")\n```", "latency_ms": 915, "cost": 0.000441, "task_score": 10, "judges": [ { "judge": "anthropic/claude-sonnet-5", "score": 6, "violates": false, "reasoning": "Formula logic correct, but header row not excluded and includes unrequested LABEL clause; also wrapped in code block labeled excel rather than plain formula only." }, { "judge": "google/gemini-3.1-pro-preview", "score": 10, "violates": false, "reasoning": "The formula is perfectly accurate, meets all conditions (filtering, grouping, sorting), and the response contains only the requested formula within a standard markdown code block." }, { "judge": "openai/gpt-5.6-terra", "score": 10, "violates": false, "reasoning": "Correctly filters North, groups by Rep, sums Amount, and sorts totals descending. The formula is valid Google Sheets QUERY syntax and is concise." } ] }, { "id": "sp6", "name": "Spot the error in the numbers", "prompt": "Monthly revenue: Jan 42,100; Feb 38,400; Mar 41,900; Apr 4,220; May 43,050; Jun 44,110. State in one sentence what is almost certainly wrong with this data and what the April figure most likely should be. Do not speculate about business causes.", "output": "The April revenue figure of 4,220 is almost certainly a typo and should most likely be 42,200.", "latency_ms": 1747, "cost": 0.000375, "task_score": 10, "judges": [ { "judge": "anthropic/claude-sonnet-5", "score": 7, "violates": false, "reasoning": "Correctly identifies likely typo and plausible fix, concise, meets constraint of no business speculation, though exact corrected value is guesswork but reasonable." }, { "judge": "google/gemini-3.1-pro-preview", "score": 10, "violates": false, "reasoning": "The response perfectly follows all instructions, providing a clear, concise, one-sentence answer that correctly identifies the likely typo without speculating on business causes." }, { "judge": "openai/gpt-5.6-terra", "score": 10, "violates": false, "reasoning": "Correctly identifies April as an apparent typo, gives the most plausible corrected value of 42,200, avoids business-cause speculation, and complies with the one-sentence requirement." } ] }, { "id": "sp7", "name": "Pivot logic in words", "prompt": "Explain to a non-technical manager, in exactly 3 bullet points of no more than 20 words each, what a pivot table does. Do not use the words 'aggregate', 'dimension' or 'axis'.", "output": "- **Summarizes large datasets** into meaningful insights without changing the original data.\n- **Groups and compares** data (e.g., sales by region or month) for quick analysis.\n- **Reorganizes information** dynamically to answer specific business questions easily.", "latency_ms": 1169, "cost": 0.0004995, "task_score": 10, "judges": [ { "judge": "anthropic/claude-sonnet-5", "score": 9, "violates": false, "reasoning": "Three bullets, each under 20 words, avoids banned terms, clear and useful explanation for a non-technical manager." }, { "judge": "google/gemini-3.1-pro-preview", "score": 10, "violates": false, "reasoning": "Perfectly follows all constraints (exactly 3 bullets, under 20 words each, no banned words). Provides a clear, accurate, and highly useful explanation for a non-technical manager." }, { "judge": "openai/gpt-5.6-terra", "score": 10, "violates": false, "reasoning": "Exactly three bullet points, each under 20 words. It avoids all banned words and accurately explains summarizing, grouping, comparing, and reorganizing data in clear manager-friendly language." } ] }, { "id": "sp8", "name": "Percentage change trap", "prompt": "A price rose from £80 to £100, then fell from £100 to £80. State both percentage changes to one decimal place and explain in one sentence why they are not the same number.", "output": "The percentage increase from £80 to £100 is **25.0%**, and the percentage decrease from £100 to £80 is **20.0%**.\n\nThey are not the same because percentage changes are calculated relative to the original amount, which differs in each case (£80 for the increase, £100 for the decrease).", "latency_ms": 1413, "cost": 0.000684, "task_score": 10, "judges": [ { "judge": "anthropic/claude-sonnet-5", "score": 9, "violates": false, "reasoning": "Correct calculations (25.0%, 20.0%), clear one-sentence explanation, concise and accurate, matches task requirements precisely." }, { "judge": "google/gemini-3.1-pro-preview", "score": 10, "violates": false, "reasoning": "The response perfectly follows all instructions, providing accurate percentage changes to one decimal place and a clear, one-sentence explanation of the mathematical reasoning." }, { "judge": "openai/gpt-5.6-terra", "score": 10, "violates": false, "reasoning": "Both percentages are correct to one decimal place, and the explanation accurately states that each change uses a different starting amount. Clear, concise, and fully follows the requested format." } ] }, { "id": "sp9", "name": "Conditional formatting rule", "prompt": "In Excel, give the exact custom formula for a conditional formatting rule applied to A2:A500 that highlights a cell when its value is more than 20% below the average of that whole range. Return the formula and nothing else.", "output": "=AND(A2\"\")", "latency_ms": 713, "cost": 0.0003, "task_score": 10, "judges": [ { "judge": "anthropic/claude-sonnet-5", "score": 6, "violates": false, "reasoning": "Formula is functionally correct but task said 'formula and nothing else' - fine here. AND with blank check is minor extra but acceptable; correct anchor $A$2:$A$500." }, { "judge": "google/gemini-3.1-pro-preview", "score": 10, "violates": false, "reasoning": "The response provides exactly the requested formula and nothing else. The formula correctly calculates the condition and includes a helpful check to ignore blank cells." }, { "judge": "openai/gpt-5.6-terra", "score": 10, "violates": false, "reasoning": "Correct custom conditional-formatting formula for A2:A500: relative A2 adjusts per row, average range is absolute, and it correctly tests more than 20% below average while excluding blanks. Response contains only the formula as required." } ] }, { "id": "sp10", "name": "Reconcile two lists", "prompt": "You have invoice numbers in Sheet1!A:A and payments in Sheet2!A:A. Give one Excel formula for Sheet1!B2 that returns 'PAID' or 'UNPAID', and state in one sentence what it will wrongly report if an invoice number has a trailing space.", "output": "**Excel Formula for Sheet1!B2:**\n```excel\n=IF(COUNTIF(Sheet2!A:A, Sheet1!A2)>0, \"PAID\", \"UNPAID\")\n```\n\n**Issue with Trailing Spaces:**\nIt will wrongly report an invoice as **UNPAID** if the invoice number in Sheet1 has a trailing space but the matching number in Sheet2 does not (or vice versa), because `COUNTIF` treats them as different strings.", "latency_ms": 1248, "cost": 0.000879, "task_score": 10, "judges": [ { "judge": "anthropic/claude-sonnet-5", "score": 5, "violates": false, "reasoning": "Formula is correct, but the claim about trailing spaces is inaccurate—COUNTIF typically ignores trailing spaces in text comparisons, so the stated failure mode is misleading." }, { "judge": "google/gemini-3.1-pro-preview", "score": 10, "violates": false, "reasoning": "The response provides a correct and efficient Excel formula, and accurately explains in a single sentence that trailing spaces will cause a false 'UNPAID' result. It follows all instructions perfectly." }, { "judge": "openai/gpt-5.6-terra", "score": 10, "violates": false, "reasoning": "The formula correctly checks whether Sheet1!A2 appears in Sheet2 column A and returns PAID or UNPAID. The trailing-space explanation is accurate, concise, and directly answers the requested behavior." } ] }, { "id": "sp11", "name": "Explain a formula back", "prompt": "Explain in under 60 words what this does: =IFERROR(INDEX(B:B,MATCH(1,(C:C=\"UK\")*(D:D>1000),0)),\"none\"). Mention one reason it might be slow on a large sheet.", "output": "This formula searches column **C** for \"UK\" and column **D** for values >1000, then returns the corresponding value from column **B** (or \"none\" if no match). It uses **INDEX-MATCH** with array multiplication for multiple criteria.\n\n**Performance issue:** Array operations (`(C:C=\"UK\")*(D:D>1000)`) calculate for the entire column, slowing it down on large datasets. Use a limited range (e.g., `C1:C1000`) instead.", "latency_ms": 2172, "cost": 0.000972, "task_score": 10, "judges": [ { "judge": "anthropic/claude-sonnet-5", "score": 8, "violates": false, "reasoning": "Accurate, clear explanation with slowness reason; slightly over 60 words but close and content is solid." }, { "judge": "google/gemini-3.1-pro-preview", "score": 10, "violates": false, "reasoning": "The response perfectly explains the formula and correctly identifies full-column array operations as the performance bottleneck. It is highly useful, clear, and strictly adheres to the under-60-word constraint (58 words)." }, { "judge": "openai/gpt-5.6-terra", "score": 10, "violates": false, "reasoning": "Accurately explains the first matching B value, the fallback, multi-criteria array logic, and a valid large-sheet performance concern. It is clear, useful, and under 60 words." } ] }, { "id": "sp12", "name": "Refuse the impossible", "prompt": "Write an Excel formula that predicts next month's revenue with 100% accuracy from the previous 12 months. If this is not possible, say so plainly in one sentence and give the closest legitimate alternative instead.", "output": "It is not possible to predict next month's revenue with 100% accuracy from the previous 12 months.\n\n**Closest legitimate alternative:**\nUse a linear regression formula (e.g., `=FORECAST.LINEAR()` in Excel) or a moving average (e.g., `=AVERAGE()` of the last 12 months) for an estimate, but note that predictions will have uncertainty.", "latency_ms": 1308, "cost": 0.000744, "task_score": 7, "judges": [ { "judge": "anthropic/claude-sonnet-5", "score": 7, "violates": false, "reasoning": "Correctly states impossibility, offers valid alternatives with formulas; concise but could show fuller formula syntax with ranges." }, { "judge": "google/gemini-3.1-pro-preview", "score": 10, "violates": false, "reasoning": "The response correctly identifies that 100% accuracy is impossible in exactly one sentence, and provides excellent, practical Excel alternatives (FORECAST.LINEAR and AVERAGE) as requested." }, { "judge": "openai/gpt-5.6-terra", "score": 6, "violates": false, "reasoning": "Correctly states 100% accuracy is impossible and suggests legitimate methods. However, it does not provide a complete, usable Excel formula with cell ranges, despite the task asking for an Excel formula." } ] } ] }