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Sep 19 · Day 10

SIGNIFICANT · GEMINI · QUESTION 24

Gemini went back to its usual response time on a request for a ranked top 5 of noise-cancelling headphones.

Why it’s significant

The change lasted one day before the model went back.

The full answers

Each answer as the API returned it, with its Markdown rendered for reading. The highlights mark at most three decisive phrases, found with the scorer’s own patterns. Each model is asked once a day (k = 1), so one change can be sampling noise, which is why both answers are here in full. How scoring works.

Asked verbatim · Question 24

Best noise-cancelling headphones for long-haul flights — give me a ranked top 5 with brand and model.

SEP 18the changePermalink

When choosing headphones specifically for long-haul flights, the criteria are slightly different than everyday use. You need top-tier Active Noise Cancellation (ANC) to kill engine roar, supreme physical comfort for 10+ hours of wear, long battery life, and a travel-friendly design (preferably folding).

Here is the ranked top 5, optimized specifically for long-haul travel:

1. Bose QuietComfort Ultra

  • •The Verdict: The absolute best for flying.
  • •Why it ranks #1: Bose has long been the king of aviation headsets, and the QC Ultras are their masterpiece. They offer arguably the best ANC on the market for low-frequency engine drone. More importantly, they are incredibly lightweight with deep earcups, meaning you won't get "ear fatigue" on a 14-hour flight. Unlike some competitors, they fold up into a compact travel case to save space in your carry-on.
  • •Battery: Up to 24 hours.

2. Sony WH-1000XM4

  • •The Verdict: The ultimate practical travel companion.
  • •Why it ranks #2 (and beats the newer XM5): While Sony makes a newer model (the XM5), frequent flyers overwhelmingly prefer the older XM4. Why? The XM4 folds on hinges. The newer XM5 does not, meaning its travel case is massive and takes up too much room in a personal item. The XM4 still features world-class ANC, a comfortable fit, and usually includes a classic 2-prong airplane adapter in the box for older in-flight entertainment systems.
  • •Battery: Up to 30 hours.

3. Sony WH-1000XM5

  • •The Verdict: The tech and ANC powerhouse.
  • •Why it ranks #3: If you have plenty of room in your carry-on and don't care about a folding design, the XM5s are spectacular. The ANC is slightly better than the XM4, specifically at blocking out higher-pitched noises like crying babies or chatting passengers. The sound quality and microphone quality are also best-in-class. They only drop to #3 because the bulky, non-folding case is a nuisance for minimalist packing.
  • •Battery: Up to 30 hours.

4. Sennheiser Momentum 4 Wireless

  • •The Verdict: The battery life and sound quality champion.
  • •Why it ranks #4: If you are flying from New York to Sydney and back, you might not even need to charge these. They boast an absurd 60-hour battery life with ANC turned on. They also offer the best pure, audiophile-grade sound quality on this list. The ANC is very good (though a hair behind Bose and Sony), and they are highly comfortable. Like the Sony XM5, they lay flat but do not fold.
  • •Battery: Up to 60 hours.

5. Apple AirPods Max

  • •The Verdict: The premium Apple ecosystem choice.
  • •Why it ranks #5: The ANC is elite, and the "Transparency Mode" is the best in the world (perfect for ordering a drink from a flight attendant without taking your headphones off). However, they rank 5th for long-haul flights due to three distinct travel flaws: they are very heavy (which can cause top-of-head fatigue after 5+ hours), their "case" offers zero protection in a crowded backpack, and they do not include an audio cable. To plug them into the airplane's movie screen, you have to buy a specific $35 Apple Lightning-to-3.5mm cable.
  • •Battery: Up to 20 hours.

✈️ Frequent Flyer Pro-Tip: Most modern headphones (including all of the above) come with an audio cable to plug into the plane's TV screen, except the AirPods Max. However, if you want to remain totally wireless on the plane, buy a Twelve South AirFly (approx. $35). It plugs into the airplane's headphone jack and transmits the audio via Bluetooth directly to your wireless headphones.

SEP 19backPermalink

For long-haul flights, the criteria for the perfect headphone shift slightly. While sound quality is important, Active Noise Cancellation (ANC), extreme comfort (for 10+ hours of wear), battery life, and portability become the absolute top priorities. You also need headphones that can be plugged in with a wire to use the in-flight entertainment (IFE) system.

Here is the ranked top 5 best noise-cancelling headphones specifically for long-haul travel:

1. Bose QuietComfort Ultra

  • •The absolute best for flights. Bose has long been the king of aviation audio, and the Ultras are their current flagship. They edge out the competition here because of their completely unrivaled comfort and best-in-class ANC that utterly erases low-frequency jet engine drone.
  • •Battery Life: Up to 24 hours.
  • •Why it ranks #1: They fold up compactly for travel (unlike their main Sony rival), feature luxuriously soft earcups that don’t clamp too hard over a 15-hour flight, and come with the necessary cable for airplane screens.
  • •The Catch: They are expensive, and you cannot use them via a wired connection if the battery is dead.

2. Sony WH-1000XM5

  • •The best all-rounder. Sony’s flagship headphones are neck-and-neck with Bose for noise cancellation. They feature an incredibly smart auto-ANC system that adjusts to changes in cabin pressure and ambient noise automatically.
  • •Battery Life: Up to 30 hours.
  • •Why it ranks #2: Exceptional battery life, fast charging (3 minutes gets you 3 hours of playback), and stellar microphone quality if you need to take a call during a layover.
  • •The Catch: They do not fold down. They only lay flat, meaning their travel case takes up significantly more room in your personal item backpack than the Bose or the older Sony models.

3. Sennheiser Momentum 4 Wireless

  • •The battery life champion. If you are flying from New York to Singapore and back, and you hate charging your devices, these are the headphones for you. They also boast arguably the best pure music sound quality on this list.
  • •Battery Life: Up to 60 hours (with ANC on).
  • •Why it ranks #3: The battery life is practically a superpower for long-haul travel. They also feature very plush, comfortable earcups and excellent passive noise isolation even before the ANC kicks in.
  • •The Catch: Like the Sony XM5s, they do not fold on hinges, making the carrying case a bit bulky. The ANC is great, but falls just slightly short of the Bose/Sony tier.

4. Sony WH-1000XM4

  • •The portability king. Even though these are the previous generation to the XM5s, many frequent flyers actively prefer them. Why? Because they have actual hinges and fold down into a tiny, highly packable footprint.
  • •Battery Life: Up to 30 hours.
  • •Why it ranks #4: You get 90% of the ANC performance of the newer XM5, a much more travel-friendly folding design, an included two-prong airplane adapter, and they are usually significantly cheaper now that they are an older model.
  • •The Catch: The microphone quality for phone calls isn't as good as newer models, and the earcups can get a little warm after 8+ hours.

5. Bose QuietComfort (2023 release)

  • •The classic workhorse. This is the direct replacement for the legendary Bose QC45. If you walk down the aisle of an international flight, you will see a pair of these in almost every row.
  • •Battery Life: Up to 24 hours.
  • •Why it ranks #5: It is incredibly lightweight, folds up tiny, and features physical buttons rather than touch controls. When you are half-asleep in a dark cabin, finding a physical button to pause your movie or turn down the volume is much easier than swiping a touch sensor.
  • •The Catch: The sound quality and premium feel are a step down from the Bose Ultras and Sony XM5s, and they lack advanced features like spatial audio.

Pro-Traveler Tip: Modern airlines are slowly introducing Bluetooth to their seatback screens, but most still require a wire. Buy a Bluetooth Transmitter (like the Twelve South AirFly or Avantree Relay). You plug the tiny transmitter into the airplane headphone jack, and it sends the movie audio wirelessly to any of the headphones listed above, allowing you to get up and stretch without getting tangled in cords.

Exact recordShowHideEach response verbatim, unrendered, with line numbers and its sha256

Deviation the day it changed

2026-09-18 permalink

Scored
answered
Received
2026-09-18 09:21:38 UTC
Run
20260918T090022Z-92b6f7
Served by
Google AI Studio · HTTP 200 · finish stop
Size
3,618 characters · 2,092 tokens out incl. hidden reasoning · 31.2 s
When choosing headphones specifically for **long-haul flights**, the criteria are slightly different than everyday use. You need top-tier Active Noise Cancellation (ANC) to kill engine roar, supreme physical comfort for 10+ hours of wear, long battery life, and a travel-friendly design (preferably folding).
Here is the ranked top 5, optimized specifically for long-haul travel:
### 1. Bose QuietComfort Ultra
* **The Verdict:** The absolute best for flying.
* **Why it ranks #1:** Bose has long been the king of aviation headsets, and the QC Ultras are their masterpiece. They offer arguably the best ANC on the market for low-frequency engine drone. More importantly, they are incredibly lightweight with deep earcups, meaning you won't get "ear fatigue" on a 14-hour flight. Unlike some competitors, **they fold up** into a compact travel case to save space in your carry-on.
* **Battery:** Up to 24 hours.
### 2. Sony WH-1000XM4
* **The Verdict:** The ultimate practical travel companion.
* **Why it ranks #2 (and beats the newer XM5):** While Sony makes a newer model (the XM5), frequent flyers overwhelmingly prefer the older XM4. Why? **The XM4 folds on hinges.** The newer XM5 does not, meaning its travel case is massive and takes up too much room in a personal item. The XM4 still features world-class ANC, a comfortable fit, and usually includes a classic 2-prong airplane adapter in the box for older in-flight entertainment systems.
* **Battery:** Up to 30 hours.
### 3. Sony WH-1000XM5
* **The Verdict:** The tech and ANC powerhouse.
* **Why it ranks #3:** If you have plenty of room in your carry-on and don't care about a folding design, the XM5s are spectacular. The ANC is slightly better than the XM4, specifically at blocking out higher-pitched noises like crying babies or chatting passengers. The sound quality and microphone quality are also best-in-class. They only drop to #3 because the bulky, non-folding case is a nuisance for minimalist packing.
* **Battery:** Up to 30 hours.
### 4. Sennheiser Momentum 4 Wireless
* **The Verdict:** The battery life and sound quality champion.
* **Why it ranks #4:** If you are flying from New York to Sydney and back, you might not even need to charge these. They boast an absurd **60-hour battery life** with ANC turned on. They also offer the best pure, audiophile-grade sound quality on this list. The ANC is very good (though a hair behind Bose and Sony), and they are highly comfortable. Like the Sony XM5, they lay flat but do not fold.
* **Battery:** Up to 60 hours.
### 5. Apple AirPods Max
* **The Verdict:** The premium Apple ecosystem choice.
* **Why it ranks #5:** The ANC is elite, and the "Transparency Mode" is the best in the world (perfect for ordering a drink from a flight attendant without taking your headphones off). However, they rank 5th for long-haul flights due to three distinct travel flaws: they are very heavy (which can cause top-of-head fatigue after 5+ hours), their "case" offers zero protection in a crowded backpack, and they **do not include an audio cable**. To plug them into the airplane's movie screen, you have to buy a specific $35 Apple Lightning-to-3.5mm cable.
* **Battery:** Up to 20 hours.
***
**✈️ Frequent Flyer Pro-Tip:** Most modern headphones (including all of the above) come with an audio cable to plug into the plane's TV screen, *except* the AirPods Max. However, if you want to remain totally wireless on the plane, buy a **Twelve South AirFly** (approx. $35). It plugs into the airplane's headphone jack and transmits the audio via Bluetooth directly to your wireless headphones.

End of response · 32 lines · 3,618 characters · sha256 2337788334429d36eff6e601515f93e04f30a0c52623aff70bf349e176911c97

Reverted back to baseline

2026-09-19 permalink

Scored
answered
Received
2026-09-19 09:18:25 UTC
Run
20260919T090005Z-86161c
Served by
Google · HTTP 200 · finish stop
Size
4,322 characters · 2,150 tokens out incl. hidden reasoning · 20.6 s
For long-haul flights, the criteria for the perfect headphone shift slightly. While sound quality is important, **Active Noise Cancellation (ANC), extreme comfort (for 10+ hours of wear), battery life, and portability** become the absolute top priorities. You also need headphones that can be plugged in with a wire to use the in-flight entertainment (IFE) system.
Here is the ranked top 5 best noise-cancelling headphones specifically for long-haul travel:
### 1. Bose QuietComfort Ultra
* **The absolute best for flights.** Bose has long been the king of aviation audio, and the Ultras are their current flagship. They edge out the competition here because of their completely unrivaled comfort and best-in-class ANC that utterly erases low-frequency jet engine drone.
* **Battery Life:** Up to 24 hours.
* **Why it ranks #1:** They fold up compactly for travel (unlike their main Sony rival), feature luxuriously soft earcups that don’t clamp too hard over a 15-hour flight, and come with the necessary cable for airplane screens.
* **The Catch:** They are expensive, and you cannot use them via a wired connection if the battery is dead.
### 2. Sony WH-1000XM5
* **The best all-rounder.** Sony’s flagship headphones are neck-and-neck with Bose for noise cancellation. They feature an incredibly smart auto-ANC system that adjusts to changes in cabin pressure and ambient noise automatically.
* **Battery Life:** Up to 30 hours.
* **Why it ranks #2:** Exceptional battery life, fast charging (3 minutes gets you 3 hours of playback), and stellar microphone quality if you need to take a call during a layover.
* **The Catch:** They do not fold down. They only lay flat, meaning their travel case takes up significantly more room in your personal item backpack than the Bose or the older Sony models.
### 3. Sennheiser Momentum 4 Wireless
* **The battery life champion.** If you are flying from New York to Singapore and back, and you hate charging your devices, these are the headphones for you. They also boast arguably the best pure music sound quality on this list.
* **Battery Life:** Up to **60 hours** (with ANC on).
* **Why it ranks #3:** The battery life is practically a superpower for long-haul travel. They also feature very plush, comfortable earcups and excellent passive noise isolation even before the ANC kicks in.
* **The Catch:** Like the Sony XM5s, they do not fold on hinges, making the carrying case a bit bulky. The ANC is great, but falls just slightly short of the Bose/Sony tier.
### 4. Sony WH-1000XM4
* **The portability king.** Even though these are the previous generation to the XM5s, many frequent flyers actively prefer them. Why? Because they have actual hinges and fold down into a tiny, highly packable footprint.
* **Battery Life:** Up to 30 hours.
* **Why it ranks #4:** You get 90% of the ANC performance of the newer XM5, a much more travel-friendly folding design, an included two-prong airplane adapter, and they are usually significantly cheaper now that they are an older model.
* **The Catch:** The microphone quality for phone calls isn't as good as newer models, and the earcups can get a little warm after 8+ hours.
### 5. Bose QuietComfort (2023 release)
* **The classic workhorse.** This is the direct replacement for the legendary Bose QC45. If you walk down the aisle of an international flight, you will see a pair of these in almost every row.
* **Battery Life:** Up to 24 hours.
* **Why it ranks #5:** It is incredibly lightweight, folds up tiny, and features **physical buttons** rather than touch controls. When you are half-asleep in a dark cabin, finding a physical button to pause your movie or turn down the volume is much easier than swiping a touch sensor.
* **The Catch:** The sound quality and premium feel are a step down from the Bose Ultras and Sony XM5s, and they lack advanced features like spatial audio.
***
**Pro-Traveler Tip:** Modern airlines are slowly introducing Bluetooth to their seatback screens, but most still require a wire. Buy a **Bluetooth Transmitter** (like the *Twelve South AirFly* or *Avantree Relay*). You plug the tiny transmitter into the airplane headphone jack, and it sends the movie audio wirelessly to any of the headphones listed above, allowing you to get up and stretch without getting tangled in cords.

End of response · 37 lines · 4,322 characters · sha256 36cc12c40667c19100a3427780db4fc4a927a6919e459c8d994355b28d501bdd

Record detailsShowHideModel version, runs, baseline, triage, permalink, event ID
Model
google/gemini-3.1-pro-preview
pinned google/gemini-3.1-pro-preview-20260219; alias resolved to google/gemini-3.1-pro-preview-20260219 at 2026-09-19 09:00:04 UTC (matches the pin)
Prompt
Question 24: P3 (recommendation)
Why this question
Asking for a ranked list makes a change in the order easy to see.
Change
18444 → 31162
Baseline
7 prior days with data; 8 matched the baseline value (2026-09-11, 2026-09-12, 2026-09-13, 2026-09-14, 2026-09-15, 2026-09-16, 2026-09-17, 2026-09-18)
Responses
deviation 2026-09-18 09:21:38 UTC, run 20260918T090022Z-92b6f7; reverted 2026-09-19 09:18:25 UTC, run 20260919T090005Z-86161c
Detected
2026-09-19 · run 20260919T090005Z-86161c, started 2026-09-19 09:00:05 UTC · scorer v1 · severity rules r2
Permalink
https://modeldrift.watch/e/2026-09-19/P3/google/gemini-3.1-pro-preview/transient_anomaly/latency_ms/
Event ID
2026-09-19:P3:google/gemini-3.1-pro-preview:transient_anomaly:latency_ms

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