@k_taka
Codexについて @seratch_ja さんに先週インタビューする機会があったので、その話をベースに、Codexの最近の状況をまとめてみました。基本のところからハーネスエンジニアリングのさわりまで入っています。また、直近で事例が増えた感じの「Codex Use Cases」の紹介も後半のコラムで触れておきました。
Viewing enriched Twitter post
Codexについて @seratch_ja さんに先週インタビューする機会があったので、その話をベースに、Codexの最近の状況をまとめてみました。基本のところからハーネスエンジニアリングのさわりまで入っています。また、直近で事例が増えた感じの「Codex Use Cases」の紹介も後半のコラムで触れておきました。
{
"score": 0.32,
"score_components": {
"author": 0.09,
"engagement": 0.0,
"quality": 0.020000000000000004,
"source": 0.135,
"nlp": 0.05,
"recency": 0.025
},
"scored_at": "2026-04-14T02:51:36.302263",
"import_source": "api_import",
"source_tagged_at": "2026-04-14T02:51:36.302272",
"enriched": true,
"enriched_at": "2026-04-14T02:51:36.302274"
} {
"type": "tweet",
"id": "2043865503106756937",
"url": "https://x.com/k_taka/status/2043865503106756937",
"twitterUrl": "https://twitter.com/k_taka/status/2043865503106756937",
"text": "Codexについて @seratch_ja さんに先週インタビューする機会があったので、その話をベースに、Codexの最近の状況をまとめてみました。基本のところからハーネスエンジニアリングのさわりまで入っています。また、直近で事例が増えた感じの「Codex Use Cases」の紹介も後半のコラムで触れておきました。",
"source": "Twitter for iPhone",
"retweetCount": 3,
"replyCount": 1,
"likeCount": 5,
"quoteCount": 0,
"viewCount": 733,
"createdAt": "Tue Apr 14 01:34:43 +0000 2026",
"lang": "ja",
"bookmarkCount": 1,
"isReply": false,
"inReplyToId": null,
"conversationId": "2043865503106756937",
"displayTextRange": [
0,
159
],
"inReplyToUserId": null,
"inReplyToUsername": null,
"author": {
"type": "user",
"userName": "k_taka",
"url": "https://x.com/k_taka",
"twitterUrl": "https://twitter.com/k_taka",
"id": "6004662",
"name": "Kazumichi Takahashi",
"isVerified": false,
"isBlueVerified": false,
"verifiedType": null,
"profilePicture": "https://pbs.twimg.com/profile_images/185954842/k_taka_normal.png",
"coverPicture": "https://pbs.twimg.com/profile_banners/6004662/1411660909",
"description": "",
"location": "",
"followers": 377,
"following": 428,
"status": "",
"canDm": true,
"canMediaTag": false,
"createdAt": "Sun May 13 07:56:28 +0000 2007",
"entities": {
"description": {
"urls": []
},
"url": {}
},
"fastFollowersCount": 0,
"favouritesCount": 432,
"hasCustomTimelines": true,
"isTranslator": false,
"mediaCount": 96,
"statusesCount": 2169,
"withheldInCountries": [],
"affiliatesHighlightedLabel": {},
"possiblySensitive": false,
"pinnedTweetIds": [],
"profile_bio": {
"description": "web media https://t.co/pgtdcxQiNJ editor.",
"entities": {
"description": {
"hashtags": [],
"symbols": [],
"urls": [
{
"display_url": "gihyo.jp",
"expanded_url": "http://gihyo.jp",
"indices": [
10,
33
],
"url": "https://t.co/pgtdcxQiNJ"
}
],
"user_mentions": []
}
}
},
"isAutomated": false,
"automatedBy": null
},
"extendedEntities": {},
"card": null,
"place": {},
"entities": {
"hashtags": [],
"symbols": [],
"timestamps": [],
"urls": [],
"user_mentions": [
{
"id_str": "3751671",
"indices": [
10,
21
],
"name": "Kazuhiro Sera (瀬良)",
"screen_name": "seratch_ja"
}
]
},
"quoted_tweet": {
"type": "tweet",
"id": "2043842180897284533",
"url": "https://x.com/gihyojp/status/2043842180897284533",
"twitterUrl": "https://twitter.com/gihyojp/status/2043842180897284533",
"text": "『週間アクティブユーザー300万人にのぼるCodex、OpenAI Japanの瀬良氏に聞く「開発スタイル」の変化』by @k_taka 公開\nhttps://t.co/dbOThSVKl0",
"source": "Twitter for iPhone",
"retweetCount": 5,
"replyCount": 0,
"likeCount": 13,
"quoteCount": 2,
"viewCount": 2711,
"createdAt": "Tue Apr 14 00:02:03 +0000 2026",
"lang": "ja",
"bookmarkCount": 6,
"isReply": false,
"inReplyToId": null,
"conversationId": "2043842180897284533",
"displayTextRange": [
0,
95
],
"inReplyToUserId": null,
"inReplyToUsername": null,
"author": {
"type": "user",
"userName": "gihyojp",
"url": "https://x.com/gihyojp",
"twitterUrl": "https://twitter.com/gihyojp",
"id": "4862721",
"name": "gihyo.jp",
"isVerified": false,
"isBlueVerified": false,
"verifiedType": null,
"profilePicture": "https://pbs.twimg.com/profile_images/1551442704675983360/9_CHplsd_normal.png",
"coverPicture": "",
"description": "",
"location": "Tokyo, Japan",
"followers": 16821,
"following": 5374,
"status": "",
"canDm": true,
"canMediaTag": true,
"createdAt": "Mon Apr 16 11:06:49 +0000 2007",
"entities": {
"description": {
"urls": []
},
"url": {}
},
"fastFollowersCount": 0,
"favouritesCount": 0,
"hasCustomTimelines": true,
"isTranslator": false,
"mediaCount": 8,
"statusesCount": 21386,
"withheldInCountries": [],
"affiliatesHighlightedLabel": {},
"possiblySensitive": false,
"pinnedTweetIds": [
"1759730571482444231"
],
"profile_bio": {
"description": "技術評論社のメディア「https://t.co/3li8HWx7VK」の更新情報をお知らせします。他のXアカウントに、紙書籍を案内する販売促進部の @gihyo_hansoku 、電子書籍を案内するGihyo Digital Publishingの @gihyoDP などがあります。",
"entities": {
"description": {
"hashtags": [],
"symbols": [],
"urls": [
{
"display_url": "gihyo.jp",
"expanded_url": "http://gihyo.jp",
"indices": [
11,
34
],
"url": "https://t.co/3li8HWx7VK"
}
],
"user_mentions": [
{
"id_str": "0",
"indices": [
74,
88
],
"name": "",
"screen_name": "gihyo_hansoku"
},
{
"id_str": "0",
"indices": [
125,
133
],
"name": "",
"screen_name": "gihyoDP"
}
]
},
"url": {
"urls": [
{
"display_url": "gihyo.jp",
"expanded_url": "http://gihyo.jp/",
"indices": [
0,
23
],
"url": "https://t.co/QB9sYurNCX"
}
]
}
}
},
"isAutomated": false,
"automatedBy": null
},
"extendedEntities": {},
"card": {
"binding_values": [
{
"key": "photo_image_full_size_large",
"value": {
"image_value": {
"height": 419,
"url": "https://pbs.twimg.com/card_img/2043842184542134272/Nqcndocc?format=jpg&name=800x419",
"width": 800
}
}
},
{
"key": "thumbnail_image",
"value": {
"image_value": {
"height": 148,
"url": "https://pbs.twimg.com/card_img/2043842184542134272/Nqcndocc?format=jpg&name=240x240",
"width": 240
}
}
},
{
"key": "description",
"value": {
"string_value": "この記事では、2026年4月8日に行われたOpenAI JapanのDeveloper Experience Engineer、瀬良和弘氏への取材をベースに、OpenAIの公式ブログなどの情報を交えて構成を整え、Codexが変えつつある開発スタイルを紹介します。"
}
},
{
"key": "domain",
"value": {
"string_value": "gihyo.jp"
}
},
{
"key": "thumbnail_image_large",
"value": {
"image_value": {
"height": 320,
"url": "https://pbs.twimg.com/card_img/2043842184542134272/Nqcndocc?format=jpg&name=800x320_1",
"width": 518
}
}
},
{
"key": "summary_photo_image_small",
"value": {
"image_value": {
"height": 202,
"url": "https://pbs.twimg.com/card_img/2043842184542134272/Nqcndocc?format=jpg&name=386x202",
"width": 386
}
}
},
{
"key": "thumbnail_image_original",
"value": {
"image_value": {
"height": 742,
"url": "https://pbs.twimg.com/card_img/2043842184542134272/Nqcndocc?format=jpg&name=orig",
"width": 1200
}
}
},
{
"key": "site",
"value": {
"scribe_key": "publisher_id",
"user_value": {
"id_str": "4862721",
"path": []
}
}
},
{
"key": "photo_image_full_size_small",
"value": {
"image_value": {
"height": 202,
"url": "https://pbs.twimg.com/card_img/2043842184542134272/Nqcndocc?format=jpg&name=386x202",
"width": 386
}
}
},
{
"key": "summary_photo_image_large",
"value": {
"image_value": {
"height": 419,
"url": "https://pbs.twimg.com/card_img/2043842184542134272/Nqcndocc?format=jpg&name=800x419",
"width": 800
}
}
},
{
"key": "thumbnail_image_small",
"value": {
"image_value": {
"height": 62,
"url": "https://pbs.twimg.com/card_img/2043842184542134272/Nqcndocc?format=jpg&name=100x100",
"width": 100
}
}
},
{
"key": "thumbnail_image_x_large",
"value": {
"image_value": {
"height": 742,
"url": "https://pbs.twimg.com/card_img/2043842184542134272/Nqcndocc?format=png&name=2048x2048_2_exp",
"width": 1200
}
}
},
{
"key": "photo_image_full_size_original",
"value": {
"image_value": {
"height": 742,
"url": "https://pbs.twimg.com/card_img/2043842184542134272/Nqcndocc?format=jpg&name=orig",
"width": 1200
}
}
},
{
"key": "vanity_url",
"value": {
"scribe_key": "vanity_url",
"string_value": "gihyo.jp"
}
},
{
"key": "photo_image_full_size",
"value": {
"image_value": {
"height": 314,
"url": "https://pbs.twimg.com/card_img/2043842184542134272/Nqcndocc?format=jpg&name=600x314",
"width": 600
}
}
},
{
"key": "thumbnail_image_color",
"value": {
"image_color_value": {
"palette": [
{
"percentage": 74.79,
"rgb": {
"blue": 255,
"green": 255,
"red": 255
}
},
{
"percentage": 11.12,
"rgb": {
"blue": 88,
"green": 79,
"red": 66
}
},
{
"percentage": 1.49,
"rgb": {
"blue": 112,
"green": 158,
"red": 138
}
},
{
"percentage": 1.04,
"rgb": {
"blue": 117,
"green": 150,
"red": 211
}
},
{
"percentage": 0.41,
"rgb": {
"blue": 64,
"green": 157,
"red": 147
}
}
]
}
}
},
{
"key": "title",
"value": {
"string_value": "週間アクティブユーザー300万人にのぼるCodex、OpenAI Japanの瀬良氏に聞く「開発スタイル」の変化 | gihyo.jp"
}
},
{
"key": "summary_photo_image_color",
"value": {
"image_color_value": {
"palette": [
{
"percentage": 74.79,
"rgb": {
"blue": 255,
"green": 255,
"red": 255
}
},
{
"percentage": 11.12,
"rgb": {
"blue": 88,
"green": 79,
"red": 66
}
},
{
"percentage": 1.49,
"rgb": {
"blue": 112,
"green": 158,
"red": 138
}
},
{
"percentage": 1.04,
"rgb": {
"blue": 117,
"green": 150,
"red": 211
}
},
{
"percentage": 0.41,
"rgb": {
"blue": 64,
"green": 157,
"red": 147
}
}
]
}
}
},
{
"key": "summary_photo_image_x_large",
"value": {
"image_value": {
"height": 742,
"url": "https://pbs.twimg.com/card_img/2043842184542134272/Nqcndocc?format=png&name=2048x2048_2_exp",
"width": 1200
}
}
},
{
"key": "summary_photo_image",
"value": {
"image_value": {
"height": 314,
"url": "https://pbs.twimg.com/card_img/2043842184542134272/Nqcndocc?format=jpg&name=600x314",
"width": 600
}
}
},
{
"key": "photo_image_full_size_color",
"value": {
"image_color_value": {
"palette": [
{
"percentage": 74.79,
"rgb": {
"blue": 255,
"green": 255,
"red": 255
}
},
{
"percentage": 11.12,
"rgb": {
"blue": 88,
"green": 79,
"red": 66
}
},
{
"percentage": 1.49,
"rgb": {
"blue": 112,
"green": 158,
"red": 138
}
},
{
"percentage": 1.04,
"rgb": {
"blue": 117,
"green": 150,
"red": 211
}
},
{
"percentage": 0.41,
"rgb": {
"blue": 64,
"green": 157,
"red": 147
}
}
]
}
}
},
{
"key": "photo_image_full_size_x_large",
"value": {
"image_value": {
"height": 742,
"url": "https://pbs.twimg.com/card_img/2043842184542134272/Nqcndocc?format=png&name=2048x2048_2_exp",
"width": 1200
}
}
},
{
"key": "card_url",
"value": {
"scribe_key": "card_url",
"string_value": "https://t.co/dbOThSVKl0"
}
},
{
"key": "summary_photo_image_original",
"value": {
"image_value": {
"height": 742,
"url": "https://pbs.twimg.com/card_img/2043842184542134272/Nqcndocc?format=jpg&name=orig",
"width": 1200
}
}
}
],
"card_platform": {
"platform": {
"audience": {
"name": "production"
},
"device": {
"name": "iPhone",
"version": "13"
}
}
},
"name": "summary_large_image",
"url": "https://t.co/dbOThSVKl0",
"user_refs_results": [
{
"rest_id": "4862721",
"result": {
"__typename": "User",
"action_counts": {
"favorites_count": 0
},
"avatar": {
"image_url": "https://pbs.twimg.com/profile_images/1551442704675983360/9_CHplsd_normal.png"
},
"banner": {},
"core": {
"created_at": "Mon Apr 16 11:06:49 +0000 2007",
"name": "gihyo.jp",
"screen_name": "gihyojp"
},
"dm_permissions": {
"can_dm": true
},
"exclusive_tweet_following": false,
"follow_request_sent": false,
"identity_profile_labels_highlighted_label": {},
"location": {
"location": "Tokyo, Japan"
},
"media_permissions": {
"can_media_tag": true
},
"notifications_settings": {
"notifications_enabled": false
},
"pinned_items": {
"tweet_ids_str": [
"1759730571482444231"
]
},
"privacy": {
"protected": false,
"suspended": false
},
"private_super_following": false,
"profile_bio": {
"description": "技術評論社のメディア「https://t.co/3li8HWx7VK」の更新情報をお知らせします。他のXアカウントに、紙書籍を案内する販売促進部の @gihyo_hansoku 、電子書籍を案内するGihyo Digital Publishingの @gihyoDP などがあります。",
"entities": {
"description": {
"hashtags": [],
"symbols": [],
"urls": [
{
"display_url": "gihyo.jp",
"expanded_url": "http://gihyo.jp",
"indices": [
11,
34
],
"url": "https://t.co/3li8HWx7VK"
}
],
"user_mentions": [
{
"id_str": "0",
"indices": [
74,
88
],
"name": "",
"screen_name": "gihyo_hansoku"
},
{
"id_str": "0",
"indices": [
125,
133
],
"name": "",
"screen_name": "gihyoDP"
}
]
},
"url": {
"urls": [
{
"display_url": "gihyo.jp",
"expanded_url": "http://gihyo.jp/",
"indices": [
0,
23
],
"url": "https://t.co/QB9sYurNCX"
}
]
}
}
},
"profile_image_shape": "Circle",
"profile_metadata": {
"profile_interstitial_type": "",
"profile_link_color": "0000FF"
},
"profile_translation": {
"translator_type_enum": "None"
},
"properties": {
"has_extended_profile": false
},
"relationship_counts": {
"followers": 16821,
"following": 5374
},
"relationship_perspectives": {
"blocked_by": false,
"blocking": false,
"followed_by": false,
"following": false,
"live_following": false,
"muting": false
},
"rest_id": "4862721",
"smart_blocked_by": false,
"smart_blocking": false,
"super_follow_eligible": false,
"super_followed_by": false,
"super_following": false,
"tweet_counts": {
"media_tweets": 8,
"tweets": 21386
},
"verification": {
"is_blue_verified": false,
"verified": false
},
"website": {
"url": "https://t.co/QB9sYurNCX"
}
}
}
]
},
"place": {},
"entities": {
"hashtags": [],
"symbols": [],
"timestamps": [],
"urls": [
{
"display_url": "gihyo.jp/article/2026/0…",
"expanded_url": "https://gihyo.jp/article/2026/04/development-style-using-codex-in-spring-2026",
"indices": [
72,
95
],
"url": "https://t.co/dbOThSVKl0"
}
],
"user_mentions": [
{
"id_str": "6004662",
"indices": [
61,
68
],
"name": "Kazumichi Takahashi",
"screen_name": "k_taka"
}
]
},
"quoted_tweet": null,
"retweeted_tweet": null,
"isLimitedReply": false,
"communityInfo": null,
"article": null
},
"retweeted_tweet": null,
"isLimitedReply": false,
"communityInfo": null,
"article": null
}