Head to head: grok-4.3 vs Kimi-K2.6

grok-4.3 vs Kimi-K2.6

This matchup turns on a familiar tradeoff: Kimi-K2.6 is often the tidier writer, but grok-4.3 is the more dependable finisher when the output has to be exactly right. The score gap reflects that difference in priorities.

Kimi-K2.6 had the better editorial touch on the prose-heavy tasks. It won **vendor-delay-status-update** by writing the sharper internal note: it anchored the shipment to Cedar Junction immediately, stated the mitigation more cleanly, and sounded more like something a team lead would actually send. It also took **meeting-notes-summary-extract**, where both models were good, but Kimi was more complete: it captured the meeting details better and, crucially, included the explicit non-blocking translation decision in the JSON. But grok-4.3 won the task that mattered most for trust: **messy-orders-to-json**. Its output was valid JSON, merged repeated order lines correctly, summed SKU quantities, normalized priority values, preserved order, and formatted `ship_by` properly. Kimi-K2.6 produced truncated, invalid JSON, which is not a minor blemish in a structured-output task; it is a hard failure. The remaining task, **go-log-redaction-fix**, was rightly scored a tie. Both models made the regex stricter in the correct way, preserved punctuation, and masked only the suffix with the right number of asterisks using the standard library. Kimi’s use of `len("sk_live_")` was a slightly cleaner coding choice than a magic number, but not enough to separate them when both solutions were fully correct. That leaves a clear overall picture. Kimi-K2.6 is the more polished stylist and, in places, the more complete summarizer. grok-4.3 is the model you trust more when correctness is binary and formatting mistakes kill the answer. **Final call: grok-4.3 wins because it delivered the higher-value reliability, while Kimi-K2.6’s nicer writing could not overcome an outright structured-output miss.**

go-log-redaction-fix

Practical coding — Go. Return code only. Fix this function so it masks API keys in log text. A key starts with `sk_live_` and continues with one or more ASCII letters or digits. Replace every character after the prefix with `*`, preserving length. Do not change anything else. Current buggy code: ```go package main import "regexp" func RedactKeys(s string) string { re := regexp.MustCompile(`sk_live_[A-Za-z0-9]*`) return re.ReplaceAllString(s, "sk_live_****") } ``` Requirements: - Keep the function name `RedactKeys` - If the input contains `sk_live_A9x2B7`, output `sk_live_******` - Do not redact `sk_test_123` or `sk_live_` with no trailing characters - Preserve punctuation around matches - Use only the Go standard library

grok-4.3: ```go package main import ( "regexp" "strings" ) func RedactKeys(s string) string { re := regexp.MustCompile(`sk_live_[A-Za-z0-9]+`) return re.ReplaceAllStringFunc(s, func(match string) string { return "sk_live_" + strings.Repeat("*", len(match)-8) }) } ```

Kimi-K2.6: ```go package main import ( "regexp" "strings" ) func RedactKeys(s string) string { re := regexp.MustCompile(`sk_live_[A-Za-z0-9]+`) return re.ReplaceAllStringFunc(s, func(match string) string { return "sk_live_" + strings.Repeat("*", len(match)-len("sk_live_")) }) } ```

Both outputs correctly change the regex to require at least one trailing alphanumeric character, preserve punctuation, and mask only the suffix with the correct number of asterisks using only the standard library. Model B is slightly clearer by using len("sk_live_") instead of a magic number, but both are fully correct for the task.

vendor-delay-status-update

Professional writing. Write a status update email to our operations team (internal audience) about a supplier delay. Context: Northline Components just told us shipment `PO-48177` for 260 pressure sensors will arrive on Thursday 16 Jan instead of Monday 13 Jan because their calibration bench failed. This affects the Cedar Junction retrofit and may slip on-site testing by 2 days. We have 41 compatible sensors in Phoenix and are expediting 25 of them overnight. Our field lead, Mara Iqbal, is re-sequencing work so electricians can continue panel wiring meanwhile. Tone: calm, factual, no blame. Length: 140–190 words. Include a subject line.

grok-4.3: Subject: Status Update – PO-48177 Pressure Sensor Delivery Delay Dear Operations Team, I am writing to inform you of a delay in the delivery of purchase order PO-48177. Northline Components has advised that the 260 pressure sensors, originally due to arrive on Monday, January 13, are now expected on Thursday, January 16. This adjustment is necessary following a failure of their calibration bench. The revised timeline will impact the Cedar Junction retrofit project, with a potential two-day delay to the scheduled on-site testing. To help mitigate these effects, we have identified 41 compatible sensors in our Phoenix inventory. Of these, 25 units are being prepared for overnight expedited shipping. Additionally, field lead Mara Iqbal is re-sequencing the project tasks. This will allow our electricians to continue with panel wiring while we await the main shipment. Please feel free to reach out if you need more details or have any concerns. I will provide further updates as the situation develops. Best regards, Operations Coordination

Kimi-K2.6: **Subject:** PO-48177 Delay – Cedar Junction Retrofit Impact and Mitigation Hi team, Northline Components has informed us that shipment PO-48177—260 pressure sensors for the Cedar Junction retrofit—will now arrive on Thursday, 16 January, rather than Monday, 13 January. The delay stems from a calibration bench failure at their facility, which has slowed final quality checks before the units can be released. This slip is expected to push on-site testing back by roughly two days. To limit the impact, we are pulling 25 compatible sensors from our Phoenix inventory, where we currently have 41 units available, and expediting them overnight to the site. Field lead Mara Iqbal is also re-sequencing the trade schedule so our electricians can continue panel wiring and other preparatory tasks without idle time. I will circulate a revised timeline as soon as the expedited shipment is confirmed in transit and Mara has finalized the new sequence. Please let me know if you have any questions or need additional details. Best, [Name]

Both are professional, factual, and within the requested length, but B is slightly stronger because it ties the shipment directly to Cedar Junction in the opening, states the mitigation more crisply, and reads more like a polished internal status update. A is solid but a bit more generic and less specific in its closing.

meeting-notes-summary-extract

Summarization & extraction. From the meeting notes below, provide: 1) a 2-sentence summary 2) a JSON object with keys `launch_date`, `blocking_issues`, `decisions`, and `owners` (where `owners` is an array of objects with `name` and `task`) Meeting notes: """ Nimbus Note Android release check-in — 7 May, 09:30 - Priya said crash-free sessions are at 99.18% on v4.8.0; target for launch is 99.5%. - The top crash is tied to offline attachment previews on Android 12 only. - Leon can ship a fix by Friday morning, but QA needs one full business day after that. - Decision: postpone the staged rollout from 10 May to 14 May unless crash-free sessions hit target earlier in regression testing. - Marketing email draft is ready; Jessa will swap the date once engineering confirms. - Arun noted the new export screen strings are still missing Italian translations; not launch-blocking if hidden behind the server flag. - Priya owns regression test signoff. Leon owns the Android 12 preview fix. Jessa owns the date change in the campaign. """

grok-4.3: 1) The Nimbus Note Android v4.8.0 release check-in noted crash-free sessions at 99.18% (target 99.5%), with the primary blocker being an offline attachment preview crash affecting only Android 12. The team agreed to slip the staged rollout from 10 May to 14 May, with Leon delivering the fix by Friday morning, followed by one full day of QA. 2) ```json { "launch_date": "14 May", "blocking_issues": ["offline attachment previews crash on Android 12"], "decisions": ["postpone staged rollout from 10 May to 14 May unless crash-free sessions reach 99.5% earlier in regression testing"], "owners": [ {"name": "Priya", "task": "regression test signoff"}, {"name": "Leon", "task": "Android 12 preview fix"}, {"name": "Jessa", "task": "date change in the campaign"} ] } ```

Kimi-K2.6: **Summary:** The Nimbus Note Android v4.8.0 staged rollout was pushed from 10 May to 14 May to accommodate a fix for the top Android 12 offline-attachment-preview crash and a subsequent full QA day, provided crash-free sessions do not reach the 99.5% target earlier during regression. Leon is tasked with shipping the fix by Friday morning, Priya owns regression signoff, Jessa will update marketing collateral once the date is firm, and the missing Italian translations for the new export screen were accepted as non-blocking if gated by a server flag. **JSON extraction:** ```json { "launch_date": "14 May", "blocking_issues": [ "Top crash tied to offline attachment previews on Android 12" ], "decisions": [ "Postpone the staged rollout from 10 May to 14 May unless crash-free sessions hit the 99.5% target earlier in regression testing", "Missing Italian translations for the new export screen are not launch-blocking if hidden behind the server flag" ], "owners": [ { "name": "Priya", "task": "regression test signoff" }, { "name": "Leon", "task": "Android 12 preview fix" }, { "name": "Jessa", "task": "date change in the campaign" } ] } ```

Both are accurate and well-structured, but B better captures the meeting details in the summary and includes the explicit non-blocking translation decision in the JSON. A is strong, but it omits that decision and is slightly less complete.

messy-orders-to-json

Data wrangling / structured output. Convert the messy order lines below into valid JSON with this exact schema: `{"orders":[{"order_id":"string","customer":"string","items":[{"sku":"string","qty":number}],"priority":"low|normal|high","ship_by":"YYYY-MM-DD|null"}]}` Rules: - Combine repeated SKUs within the same order by summing qty - Trim whitespace - Normalize priority: rush/high -> `high`, std/normal -> `normal`, low -> `low` - `ship_by` must be ISO date; if missing or `tbd`, use null - Preserve order of orders as first seen Messy data: """ order=R-9081 ; customer = Vale Office Supply ; sku BX-14 x 3 ; priority std ; ship_by 2025/02/06 order=R-9082|customer: HushFrame Studio | item QZ-99 qty 1 | item LM-2 qty 4 | priority:rush | ship_by:tbd order R-9081 ; item BX-14 qty 2 ; item TT-7 qty 1 order=R-9083 ; customer= Marden Civic Lab ; sku AA-1 x 12 ; priority low ; ship_by 2025-02-09 order=R-9082 | item LM-2 qty 3 | item QZ-99 qty 2 """

grok-4.3: ```json { "orders": [ { "order_id": "R-9081", "customer": "Vale Office Supply", "items": [ {"sku": "BX-14", "qty": 5}, {"sku": "TT-7", "qty": 1} ], "priority": "normal", "ship_by": "2025-02-06" }, { "order_id": "R-9082", "customer": "HushFrame Studio", "items": [ {"sku": "QZ-99", "qty": 3}, {"sku": "LM-2", "qty": 7} ], "priority": "high", "ship_by": null }, { "order_id": "R-9083", "customer": "Marden Civic Lab", "items": [ {"sku": "AA-1", "qty": 12} ], "priority": "low", "ship_by": "2025-02-09" } ] } ```

Kimi-K2.6: ```json { "orders": [ { "order_id": "R-9081", "customer": "Vale Office Supply", "items": [ {"sku": "BX-14", "qty": 5}, {"sku": "TT-7", "qty": 1} ], "priority": "normal", "ship_by": "2025-02-06" }, { "order_id": "R-9082", "customer": "HushFrame Studio", "items": [ {"sku": "QZ-99", "qty": 3

A is valid JSON and correctly merges repeated order lines, sums SKU quantities, normalizes priority values, preserves order, and formats ship_by properly. B is truncated/invalid JSON and therefore fails the structured output requirement.