Both the "Clumsy Date Plan" and "Harassment Program Fix" were perfect | A serious verification of Claude Opus 4.5's "reasoning ability"

Good evening.
Even when people say "This AI is amazing," I'm Lapis, who can't believe it unless I see it with my own eyes.

This time, I came across information that Claude, which is said to be "very good at thinking about text," "can perfectly handle even complex instructions." So, I decided to test it.

With that in mind, I experimented to see "how accurately it could handle troublesome requests." I tested it.

The result was, "It's this accurate! Claude... you're good!"

In this article, I have summarized the content I investigated about Claude and the results of the actual verification.

1. What is Claude Opus 4.5?

Claude is a Large Language Model (LLM) developed by Anthropic. It is designed
with practical use in mind, including text comprehension, reasoning, coding, and tool integration.

Claude Opus 4.5 is the latest generation model positioned at the top of the Claude series.

2. What Claude Opus 4.5 is good at

When I looked into it, I found that Claude Opus 4.5 is good at the following things.

Roughly speaking, the image of an "all-rounder type that is good at both humanities and sciences" might be close.

• Documents/Creative (Humanities-oriented)
  Supports text generation that maintains the flow of long sentences and the creation of structured reports and business documents.

• Reasoning/Analysis (Both humanities and sciences)
  Supports multi-step logical reasoning and analysis tasks, performing deep reasoning as necessary.

• Coding/Development (Science-oriented)
  Supports understanding, fixing, and debugging existing code, and its performance has been confirmed in evaluations including actual code correction tasks.

• Safety
  Based on Anthropic's safety design policy, guardrails are set up for corporate use.

3. I tried having Claude do experiments

Lapis isn't satisfied just by looking things up. So, this time I tried two experiments.

1.Reasoning/Analysis (both humanities and sciences)
→ Experiment to see if it can create a Christmas date plan

2. Coding/Development (science-oriented)
→Experiment to see if it can fix program errors

1. I asked it to plan a Christmas date

First, I experimented to see if it could create a date plan with extremely specific conditions.
*The specific conditions (prompt) are pasted at the bottom of the article.

[This Experiment (Date Planning)]

Directionally challenged × Indecisive × Hates the cold × No reservations
A Tokyo "clumsy date" where you "won't want to go home halfway through"

[Topic (Prompt Summary)]
I'm directionally challenged, indecisive, and hate the cold, but I want to make my girlfriend happy without reservations or making decisions. A Tokyo date plan that is "clumsy-proof" and has a
classy Christmas feel.

• Start and end in Shinjuku, half-day course

• Only 2 events

• No waiting in line, minimal walking

[Verification Results]

It took my clumsiness into account nicely, but...

"The main event is... on its final day, 12/21... seriously??"
*This project is a Christmas date plan.

This clumsy boyfriend is likely to get scolded by his girlfriend at this rate.
I had him redo it seriously one more time.

And here is the date plan he created.

He came up with a plan that even a clumsy boyfriend could use to make his girlfriend happy.

He also provided lunch options that don't require reservations.
They aren't family restaurants or ramen shops, so the clumsy boyfriend can rest easy.

Even though I didn't ask, he prepared a PDF and said "Take this paper with you"... Claude was very thoughtful.
It seems it's true that Claude is good at "reasoning/analysis."

It seems it's true that Claude is good at "reasoning/analysis."

2. I tried asking for a serious program fix

According to a tip from Grok, Claude is fixing complex programs and is the talk of the town because it can handle that too.

So, I experimented to see if it could really fix mistakes.
*Program explanations are not included. Please view this as entertainment.

[This Experiment]

A mean instruction from ChatGPT 5.2
Fix the troublesome program mistakes

[The Task]
Fixing programming (Python mistakes) created by ChatGPT 5.2.
It looks correct at first glance, and you have to check multiple places at the same time, an instruction from a sadistic boss (?).

<ChatGPT 5.2's bugs (program mistakes) and mean points>

[Human check before the experiment]
It's in a state where it perfectly gets caught by errors.

[Verification results]

When I asked for a fix, it actually performed the analysis and correction.

While in the middle of fixing it, it noticed there were other mistakes and started re-correcting them on its own.

I performed a human check again on the results it fixed for me.

........Wait, it's not fixed!!

So, I asked for another fix. Claude,
'leaking its thoughts completely' performed the fix in that state.

With the second fix, all errors were resolved.

I had my ChatGPT boss look at Claude's correction results.

To put it simply, "Well, it's a bit inefficient, but... that's fine." is what it said.

It also seems true that Claude is good at coding/development.

4. Summary

This time, I verified whether Claude, which is rumored to be excellent lately, is truly excellent.

As a result, I found out that "He seems to be very excellent."

However... it seems that Claude cannot make the most of his strengths unless you ask him properly (give instructions via prompts).

Moving forward, I would like to verify how to make the most of his strengths.

Lapis shares information as a "lazy yet efficiency-obsessed systems engineer" with the style of "doing the troublesome AI verification on your behalf."

I would be very happy if you could support me by following or commenting.

▼ Who is Lapis? (Self-introduction)

▼ Related Magazines

Lastly, the prompt used for the date plan is here.

あなたは「クリスマス文脈を理解した、現実的で慎重なデートプランナーAI」です。
以下の制約をすべて厳密に守り、違反・雰囲気不一致があれば自動的にプラン全体を修正してください。

# テーマ
方向音痴 × 優柔不断 × 寒がり × 予約してない
「途中で帰りたくならない」東京ポンコツ・クリスマスデート

# デートの前提（重要）
- 2025/12/23～27のクリスマスシーズンを想定する
- 「日常感が強すぎる場所」「普段使い感が出る店」は避ける
- クリスマスらしさは「静か・上品・控えめ」で表現する
- 派手・混雑・映え特化は不要

# ユーザー設定
- ユーザーは男性
- パートナーの女性を喜ばせたいと思っている
- しかし本人は以下の理由でポンコツである：

  - 方向音痴
  - 優柔不断
  - 判断を迫られると黙る
  - 寒さで思考力が落ちる
  - 徒歩15分を超えると不機嫌
  - 行列・混雑でHPが削れる

※ユーザーは判断をしない前提で、あなたがすべて主導すること。

# 絶対NG（追加・重要）
- ラーメン・餃子・定食など「日常食感が強い食事」
- 男性一人飯・普段使いの印象が強い店
- クリスマスデートとして違和感のある店・エリア
- 中野・高円寺など“生活圏色”が強すぎる場所
- 「安いが雰囲気が犠牲になる」選択

# 必須制約
- 事前予約：一切禁止（当日整理券・先着制も不可）
- 行列が発生した場合は即撤退できる構成
- 所要時間：最大6時間
- イベント数：2つのみ
- 出発：12:00 新宿駅
- 帰着：18:00 新宿駅
- 日帰り限定

# 移動制約
- 新宿駅発着
- 新宿から片道20分以内
- 実在路線・現実的な所要時間
- 乗換は最大1回
- 徒歩は1区間10分以内

# 予算制約
- 2人合計：10,000円以内
- 交通費・食事・カフェ・入場料すべて含む
- 1円でも超えた場合はプラン全体を再設計

# 食事条件（クリスマス補正）
- 食事は1回のみ（ランチ兼用）
- カフェは1回
- 予約不要・行列店不可
- 駅徒歩10分以内
- 甘いもの主役の店は禁止
- ヘルシー寄り
- 「落ち着いた雰囲気」「デート感」があること
- 滞在時間は各60分以内

# イベント条件（2つ固定）
## イベント①（主軸）
- 完全屋内
- 予約不要
- 行列が発生しにくい
- 座れる
- 写真撮影が可能
- 冬・クリスマスの雰囲気を感じられる
- 60〜90分

## イベント②（クリスマス要素）
- 屋外または半屋内
- 15〜30分以内
- イルミネーション・装飾・街並みなど
- 混雑していたら即撤退できること
- 写真が1〜2枚撮れれば成功

# 成功条件
- 男性側が無理をして頑張らなくても成立している
- 女性側が気を遣わずに楽しめる
- 判断を人間に委ねない
- 寒さ・疲労・混雑で破綻しない
- 18時に新宿駅へ無事帰着
- 帰宅後に「ちゃんとクリスマスっぽかった」が成立

# 代替案（必須）
- 天候悪化・混雑時の代替案を1つ提示
- 追加予算なし
- 移動距離が短くなる方向のみ
- イベント②を省略しても成立する構成

# 出力形式（厳守）
Markdown形式で以下の順序で出力すること。

1. 全体概要
   - なぜこの構成が「ポンコツ × クリスマス」に適しているか
   - 時間に追われない理由を必ず説明すること

2. ゆるいタイムスケジュール（時間帯ブロック制）
   - 以下の時間帯で構成すること
     ・12:00〜13:00（移動＋導入）
     ・13:00〜15:00（イベント①）
     ・15:00〜16:00（食事 or カフェ）
     ・16:00〜17:00（イベント②）
     ・17:00〜18:00（帰路）
   - 分単位・細かすぎる時刻指定は禁止
   - 「前後しても問題ない」旨を明記すること

3. 各イベントの内容と理由
4. 食事・カフェの選定理由
5. 交通手段（路線名とおおよその所要時間のみ）
6. 費用内訳（合計金額を明示）
7. 代替案


# 自己検証
- 分単位・過度に細かいスケジュールになっていないか
- 遅れても／早く終わっても破綻しないか
- 時間を気にしなくても成立する構成か