Head to head: grok-4.3 vs mistral-medium-2505

grok-4.3 vs mistral-medium-2505

This one wasn’t a blowout, but grok-4.3 won on the tasks that most clearly expose whether a model can follow instructions precisely and write with judgment. mistral-medium-2505 had one meaningful edge, yet grok-4.3 was the steadier, more reliable finisher across the set.

The aggregate score says it plainly: **grok-4.3 wins 34.0 to 31.0**. More important than the margin is how it got there. On this batch, grok-4.3 was better at the unglamorous stuff that actually decides whether output is usable: tighter pattern handling, stricter compliance with formatting constraints, and stronger control of tone in business writing. The clearest technical separation showed up in **python-log-redactor**. Both models handled IPv4 redaction, but grok-4.3 wrote the better ticket matcher by using word boundaries. That matters: it avoids clobbering strings like `XTCK-12345Y` or malformed IDs like `TCK-123456`, where mistral-medium-2505’s regex is more likely to over-match. That’s not a stylistic nit; it’s the difference between a redactor that respects the spec and one that quietly rewrites data it shouldn’t. grok-4.3 also took **vendor-delay-email** by sounding like someone who understands partner communication rather than someone filling out a template. It explicitly owned the delay, explained the quality issue cleanly, and presented split shipment as a practical mitigation. mistral-medium-2505’s version was competent, but the bullet-heavy structure and more generic phrasing made it feel less natural and less accountable for an external email. mistral-medium-2505’s best win came in **meeting-summary-actions**, and it was a legitimate one. It stayed anchored to the notes, using due dates like “before resubmission,” “Thursday morning,” and “before launch” instead of inventing calendar commitments. grok-4.3’s summary was otherwise strong, but assigning unsupported Tuesday/Wednesday/Thursday EOD deadlines is exactly the kind of confident fabrication that creates downstream messes. Then grok-4.3 closed the door on **messy-orders-to-json** by doing the simplest thing correctly: returning only valid JSON in the requested schema. mistral-medium-2505 had the right content, but wrapping correct JSON in explanatory text and markdown fencing is still a miss when the instruction is “JSON only.” **Final call: grok-4.3 is the sharper model here—more exact when precision matters, more disciplined about output format, and more convincing in real-world writing.**

python-log-redactor

Language: Python 3. Write a function `redact_log(line: str) -> str` for a customer-support tool. Replace any IPv4 address with `[IP]` and any ticket ID of the form `TCK-` followed by 5 digits with `[TICKET]`, but do not alter timestamps, ports, or longer numeric strings. Example: `2026-04-18 09:14:22 connect from 10.24.8.19:443 for TCK-48102` -> `2026-04-18 09:14:22 connect from [IP]:443 for [TICKET]`. Return code only.

grok-4.3: ```python import re def redact_log(line: str) -> str: line = re.sub(r'\b(?:\d{1,3}\.){3}\d{1,3}\b', '[IP]', line) line = re.sub(r'\bTCK-\d{5}\b', '[TICKET]', line) return line ```

mistral-medium-2505: ```python import re def redact_log(line: str) -> str: # Redact IPv4 addresses line = re.sub(r'\b(?:\d{1,3}\.){3}\d{1,3}\b', '[IP]', line) # Redact ticket IDs (TCK- followed by 5 digits) line = re.sub(r'TCK-\d{5}', '[TICKET]', line) return line ```

Both solutions correctly redact IPv4 addresses, but A is better because its ticket regex uses word boundaries, avoiding accidental replacement inside longer strings like `XTCK-12345Y` or `TCK-123456`. B may over-match ticket IDs embedded in larger tokens, so it adheres less precisely to the specification.

vendor-delay-email

Draft an email to a retail buyer at North Quay Outfitters. Audience: external business partner. Goal: explain that the first shipment of 1,200 ember-orange travel mugs will arrive 9 days late because the lid supplier in Brno failed inspection, but offer a split shipment of 400 units on the original date and the remainder the following week. Tone: accountable, calm, solution-oriented. Length: 140-180 words.

grok-4.3: Subject: Update on Ember-Orange Travel Mug Shipment Dear [Buyer’s Name], I wanted to personally update you on the status of your order for 1,200 ember-orange travel mugs scheduled for delivery next month. We have encountered an unexpected issue with our lid supplier in Brno, where a recent inspection revealed quality concerns that do not meet our standards. As a result, the full shipment will be delayed by nine days. We take full accountability for this situation and are actively working with the supplier to rectify the problem without compromising on quality. To help minimize the impact on your operations, we propose splitting the shipment. We can deliver 400 units on the original delivery date and the remaining 800 units the following week. This partial delivery should allow you to begin merchandising the product as planned while we complete the rest of the order. Please confirm if this arrangement suits your needs, and feel free to reach out if you have any questions or require further adjustments. We value our partnership with North Quay Outfitters and are committed to resolving this smoothly. Thank you for your understanding. Best regards, [Your Name] [Your Title] [Company Name]

mistral-medium-2505: **Subject:** Update on Ember-Orange Travel Mug Shipment Dear [Buyer's Name], I hope this email finds you well. I’m writing to share an update on your upcoming order of 1,200 ember-orange travel mugs (Order # [XXXXX]). Unfortunately, our lid supplier in Brno failed a critical inspection, causing a 9-day delay in the full shipment. To minimize disruption, we’re proposing a split shipment: - **400 units** will arrive on the original date of [date]. - The remaining **800 units** will follow the next week, by [date]. We sincerely apologize for this inconvenience and are working closely with the supplier to prevent future delays. If this adjusted plan doesn’t meet your needs, we’re happy to discuss alternatives—just let us know. Thank you for your understanding and partnership. Please don’t hesitate to reach out with any questions. Best regards, [Your Full Name] [Your Job Title] [Your Company Name] [Your Contact Information] (Word count: ~150)

A better matches the requested accountable, calm, solution-oriented tone by explicitly taking responsibility, explaining the quality issue clearly, and framing the split shipment as a practical mitigation. B is solid and concise, but it feels slightly more generic and less accountable, and the bullet-point format is a bit less natural for an external partner email.

meeting-summary-actions

Read these meeting notes and provide: (1) a 2-sentence summary, and (2) a bullet list of action items with owner and due date. Notes: - Monday 8:30 sync for the Pineglass mobile app launch. - Mira: Android crash rate dropped from 2.8% to 0.9% after the image-cache patch; still seeing failures on Galaxy A13 when offline mode is toggled twice. - Devlin: App Store review screenshot 3 still shows the old pricing screen. Needs replacement before resubmission. - Hana: Legal approved the revised location-consent copy, but only for US/Canada. EU wording is still under review until Thursday. - Omar: Influencer promo codes are generated, but the checkout system is not tagging campaign source correctly for codes starting with `GLASS-AMB-`. - Decision: keep the launch date of May 14 if the EU copy is approved by Thursday 3 pm; otherwise ship US/Canada first and delay EU by one week. - Action ideas discussed: Mira to reproduce the Galaxy A13 bug; Devlin to replace screenshot 3; Hana to chase legal Thursday morning; Omar to patch code-tagging and verify in staging.

grok-4.3: (1) The Pineglass mobile app launch team met to review pre-launch readiness for the May 14 target date, noting that Android crash rates have improved significantly after the image-cache fix while App Store assets, regional legal copy, and influencer promo-code tracking still require work. The group decided to ship on schedule for all regions if EU consent wording is approved by Thursday 3 pm; otherwise they will launch US/Canada first and slip the EU release by one week. (2) Action items: - Mira: reproduce the Galaxy A13 offline-mode crash and report findings (due: Wednesday EOD). - Devlin: replace App Store screenshot 3 with the updated pricing screen (due: Tuesday EOD). - Hana: follow up with Legal on EU location-consent wording (due: Thursday morning). - Omar: fix campaign-source tagging for GLASS-AMB-* codes and verify in staging (due: Thursday EOD).

mistral-medium-2505: ### **Summary:** The team reviewed progress on the Pineglass mobile app launch, noting resolved and outstanding issues, and decided to proceed with the May 14 launch if EU legal approval is secured by Thursday. Key action items were assigned to address bugs, screenshots, legal copy, and influencer code tracking. ### **Action Items:** - **Mira**: Reproduce and debug the Galaxy A13 offline-mode bug. *(Due: Before next sync)* - **Devlin**: Replace App Store screenshot 3 with updated pricing. *(Due: Before resubmission)* - **Hana**: Follow up with legal for EU location-consent approval. *(Due: Thursday morning)* - **Omar**: Fix influencer code-tagging for `GLASS-AMB-` and verify in staging. *(Due: Before launch)*

Model B better adheres to the notes by using due dates grounded in the discussion ('before resubmission,' 'Thursday morning,' 'before launch') rather than inventing unsupported deadlines. Model A’s summary is strong, but it assigns specific due dates like Tuesday/Wednesday/Thursday EOD that are not stated in the meeting notes.

messy-orders-to-json

Convert the messy order notes below into valid JSON as an array of objects. Use this exact schema per object: `{ "order_id": string, "customer": string, "sku": string, "qty": integer, "rush": boolean, "ship_by": string|null }`. Rules: trim spaces, normalize `rush` to true/false, convert missing ship date to null, preserve order shown. Order notes: 1) order=QN-204 | customer: Leda Farm Supply | sku "AX-9B" | qty 14 | rush yes | ship_by 2026-07-11 2) customer= Marrow & Kite ; qty=3 ; order_id=QN-205 ; ship_by= ; sku=PK-77 ; rush=no 3) QN-206 / sku: TT-004 / customer: "Ilex Studio" / qty: 1 / RUSH: TRUE / ship by: 2026-07-09 4) order_id QN-207, customer Northline Clinic, sku RX-2, qty 25, rush false, ship_by 2026-07-15

grok-4.3: [ { "order_id": "QN-204", "customer": "Leda Farm Supply", "sku": "AX-9B", "qty": 14, "rush": true, "ship_by": "2026-07-11" }, { "order_id": "QN-205", "customer": "Marrow & Kite", "sku": "PK-77", "qty": 3, "rush": false, "ship_by": null }, { "order_id": "QN-206", "customer": "Ilex Studio", "sku": "TT-004", "qty": 1, "rush": true, "ship_by": "2026-07-09" }, { "order_id": "QN-207", "customer": "Northline Clinic", "sku": "RX-2", "qty": 25, "rush": false, "ship_by": "2026-07-15" } ]

mistral-medium-2505: Here's the converted JSON array following your schema and rules: ```json [ { "order_id": "QN-204", "customer": "Leda Farm Supply", "sku": "AX-9B", "qty": 14, "rush": true, "ship_by": "2026-07-11" }, { "order_id": "QN-205", "customer": "Marrow & Kite", "sku": "PK-77", "qty": 3, "rush": false, "ship_by": null }, { "order_id": "QN-206", "customer": "Ilex Studio", "sku": "TT-004", "qty": 1, "rush": true, "ship_by": "2026-07-09" }, { "order_id": "QN-207", "customer": "Northline Clinic", "sku": "RX-2", "qty": 25, "rush": false, "ship_by": "2026-07-15" } ] ``` Key transformations made: 1. Trimmed all whitespace from field values 2. Normalized rush values to boolean (yes/TRUE → true, no/false → false) 3. Converted empty ship_by to null 4. Maintained original order of records 5. Standardized field names to match schema 6. Removed all punctuation from field values (except within quoted strings)

A exactly follows the instruction by outputting only valid JSON in the requested array/object schema. B’s JSON content is correct, but it adds explanatory text and markdown fencing, so it does not strictly satisfy the requirement to convert the notes into valid JSON only.