Codex, Claude Code, Gemini: giá và giới hạn sử dụng khác nhau thế nào?

TL;DR: Tinh den 02/07/2026, ba phe dang theo ba cach thu tien rat khac nhau. Codex la bundle trong ChatGPT va day manh vao cua so 5 gio + weekly limits + credits. Claude Code cong bo ro Pro $20/thang, Max 5x $100/thang, Max 20x $200/thang, kem session 5 gio + weekly caps. Tuyen Google de dem hon voi daily request caps, nhung can doc kem dong chu migration sang Antigravity CLI tu 18/06/2026.

Neu ban khong phai ky su chuyen nghiep, sticker price chi la mot nua cau chuyen. Nua con lai la:

• ban co biet khi nao quota reset khong;
• ban co du doan duoc mot buoi coding se ton bao nhieu khong;
• khi het han muc, ban co duong mua them / top-up / pay-as-you-go sach se hay khong.

Day la ly do toi cho rang bai so sanh nao chi liet ke "$20, $100, $200" ma khong noi reset logic deu qua nong.

Nhin nhanh: ba mo hinh kinh te khac nhau

Tuyen cong cu	Cach ban tra tien	Logic gioi han	Tac dong thuc te
Codex	Bundle trong bac thang ChatGPT	Cua so 5 gio, local va cloud cung chia mot window, co the co weekly limits bo sung	Rat manh cho session tap trung, nhung de dot quota neu prompt mo rong
Claude Code	Pro/Max theo thang, co usage credits	Session 5 gio + weekly limits dung chung cho claude.ai, Claude Code, Claude Desktop	De hoc va debug, nhung nguoi "chat ca ngay" de can weekly cap
Google coding path	Standard free/Premium/Code Assist hoac pay-as-you-go	Daily request caps, co per-minute availability guardrails; product dang migration	De lap budget hang ngay, nhung can theo sat chuyen doi Gemini -> Antigravity

1. Codex: bundle pricing, focus vao cường do session

Trang pricing cua Codex ghi ro: Codex duoc include trong ChatGPT Free, Go, Plus, Pro, Business va Enterprise. Day la diem dau tien can nho. Voi consumer, ban khong mua "Codex-only" subscription.

OpenAI mo ta:

• Free va Go: chi la limited trial access cho Codex.
• Plus: hop cho "mot vai phien coding tap trung moi tuan".
• Pro: huong toi "nhung phien dai, cuong do cao moi ngay".

Chi tiet quan trong nhat nam o phan usage limits. Trang Codex pricing ghi ro:

• local messages va cloud tasks chia se cung mot five-hour window;
• additional weekly limits may apply;
• khi den limit, nguoi dung Plus/Pro co the mua them credits de tiep tuc;
• neu dung API key, ban co the chay them local tasks theo standard API rates.

Phan text render cong khai hien len ro nhat cho tab Plus:

• GPT-5.4: 20-100 local messages / 5h
• GPT-5.4-mini: 60-350 local messages / 5h
• GPT-5.3-Codex: 30-150 local messages / 5h, 10-60 cloud tasks / 5h, 20-50 code reviews / 5h

Trang do cung noi Pro cho ban 5x hoac 20x more usage than Plus. Noi cach khac, OpenAI muon ban hieu Codex theo muc do su dung thuc te hon la theo mot khung "x request/ngay" co dinh.

Tac dong voi vibe coding

Mo hinh nay rat hop neu ban lam theo dot:

• toi nay chot mot bug mobile;
• sang mai de agent review diff;
• cuoi tuan mo mot session lon sua 3-4 file.

Nhung no khong than thien bang daily cap voi nguoi moi. Ban co the bat dau voi y nghi "toi chi hoi vai cau", roi bien thanh:

• agent doc 12 file;
• tao ke hoach;
• chay cloud task;
• review lai diff;
• dot rat nhanh cua so 5 gio.

Neu ban build in public, hay nho: Codex tinh theo muc do cong viec gan voi repo va tools, khong chi theo so tin nhan chat.

Ve gia cua Codex

Day la diem can thanh that: page text cong khai cua ChatGPT/Codex hien cho thay bac thang plan va gioi han Codex rat ro, nhung khong hien clean numeric card price trong plain-text render. Vi vay, de tranh dong bang mot con so co the khac theo checkout hoac khu vuc, toi khong coi Codex la "x USD cho rieng coding" ma xem no la mot phan cua ChatGPT plan ladder.

Tac dong cua cach bundle nay la:

• neu ban da tra ChatGPT vi cong viec khac, chi phi bien them cho coding co the de chap nhan hon;
• neu ban chi muon coding tool rieng, ban se co cam giac dang mua ca he sinh thai thay vi mua mot bua an dung mon.

2. Claude Code: gia ro hon, gioi han ro hon, nhung khong co nghia la vo han

Anthropic cong bo ro hon ve sticker price cho ca nhan:

• Pro: $20/thang tai My
• Max 5x: $100/thang
• Max 20x: $200/thang

Trang product page cua Claude Code va help center deu ghi Claude Code duoc include trong cac plan nay.

Phan limit thi cang ro hon:

• Pro: it nhat 5x usage per session so voi free plan trong gio cao diem; session reset moi 5 gio.
• Pro: co weekly usage limit ap dung tren tat ca model.
• Max: co 5x hoac 20x more usage than Pro, dong thoi co weekly limits rieng.
• Help center nhan manh usage cua claude.ai, Claude Code va Claude Desktop deu tinh chung mot ngan sach.

Anthropic con noi them:

• nguoi dung Pro/Max co the bat usage credits de tiep tuc lam viec khi vuot included usage;
• trong Claude Code, neu dung API key thi ban se sang mo hinh pay-as-you-go billed per token;
• trang help "Models, usage, and limits in Claude Code" khuyen dung Sonnet mac dinh, chi doi sang Opus cho task thuc su kho, vi Opus "an quota" manh hon.

Tac dong voi vibe coding

Claude Code de du doan hon Codex o cho:

• ban biet ro Pro = $20, Max = $100/$200;
• ban biet ro phai canh session 5 gio va weekly caps;
• tai lieu chinh thuc cho ban nhieu loi khuyen rat thuc dung de tiet kiem quota: /clear, /compact, Sonnet mac dinh, giu CLAUDE.md gon.

Nhung mot diem nguoi moi hay bo qua la: Claude rat de "giai thich them" khi ban hoi mo rong. Neu ban quen cam giac no noi chuyen hay, ban de keo dai session hon.

Do do, Claude Code cuc hop khi:

• ban can hoc trong luc sua code;
• ban muon AI tranh luan ve kien truc hoac bug;
• ban chap nhan rang mot subscription de hoc tot hon chua chac la subscription de "spam task vo tan".

3. Google coding path: de lap ngan sach theo ngay hon, nhung phai doc ky dong chu migration

Phe Google hien can tach lam hai lop:

1. Google Developer Program / Gemini Code Assist / Gemini CLI - cach cong bo pricing va quotas trong docs.
2. Qua trinh chuyen tiep sang Antigravity CLI - su that hien tai cua san pham cho ca nhan.

Nhung con so cong khai de doc

Trang Google Developer Program Plans & Pricing ghi:

• Standard: no cost
• Premium: $19.99/thang

Trang nay dong thoi cho thay doi voi Gemini CLI:

• Standard: 1000 requests per user per day
• Premium: 1500 requests per user per day

Trang Gemini CLI: Quotas and pricing cong bo chi tiet hon:

• Google account / Gemini Code Assist individual: 1,000 requests/ngay
• Google AI Pro: 1,500 requests/ngay
• Google AI Ultra: 2,000 requests/ngay
• Gemini API key free tier unpaid: 250 requests/ngay
• Workspace Code Assist Standard: 1,500 requests/ngay
• Workspace Code Assist Enterprise: 2,000 requests/ngay

Trang Gemini Code Assist quotas and limits bo sung:

• requests cua Gemini Code Assist agent mode va Gemini CLI duoc gop chung;
• requests bi gioi han per user per minute va phu thuoc availability luc cao diem;
• khi dat max/day, ban khong the gui them request den khi quota reset.

Nhung dong chu ma ban bat buoc phai thay

Chinh tai lieu cua Google ghi ro:

• Gemini CLI will be replaced by Antigravity CLI on June 18th cho unpaid tier va Google One users.
• Tai trang quotas cua Gemini Code Assist, Google note them: starting June 18, 2026, Gemini CLI va IDE extensions stopped serving requests cho Gemini Code Assist for individuals, Google AI Pro va Google AI Ultra tiers.

Day la chi tiet then chot. Neu ban so sanh "Gemini" ma khong ke moc 18/06/2026, ban dang viet bai tu van da cu.

Tac dong voi vibe coding

Ve mat tam ly su dung, phe Google de hieu nhat:

• 1,000 request/ngay nghe de lap ke hoach hon "5 gio + weekly cap";
• Premium 19.99 de vao cua canh tranh voi Claude Pro 20.

Nhung ve mat van hanh, phe Google phuc tap hon:

• ten san pham va backend dang di chuyen;
• docs free va current experience khong phai luc nao cung trung mot mot;
• neu ban build in public, rui ro lon nhat la toi live tren stream thi moi phat hien account path cua minh da sang he khac.

Subscription va pay-as-you-go: dau la diem chuyen

Voi ca ba phe, toi goi nguyen tac nay la "subscription de hoc, pay-as-you-go de mo rong".

Nen o lai subscription khi...

• ban chua biet burn rate cua minh;
• task chu yeu la UI nho, content site, script don gian;
• ban can gioi han tu nhien de tranh nghich qua tay.

Nen sang pay-as-you-go khi...

• ban da co workflow co lap lai;
• ban can chay task dai ma khong muon bi dut mach vi weekly cap;
• ban chiu trach nhiem theo doi chi phi bang /cost, /stats model, billing dashboard.

Nguoi moi nhay som sang token billing thuong gap hai van de:

1. khong biet request nao dang dot tien;
2. tuong task nho nhung agent goi model nhieu lan.

Chi phi that khong nam o sticker price

Co bon loai chi phi ma blog so sanh thuong bo qua:

• chi phi review: diff dai 500 dong co the "mien phi" ve quota nhung dat ve thoi gian;
• chi phi gian doan: dang live coding ma hit weekly cap moi dau tuan sau;
• chi phi hoc tap: tool nao giai thich tot giup ban dung lap lai loi;
• chi phi on dinh: san pham dang transition se bat on hon san pham dung ten, dung flow.

Neu ban la nguoi build in public, toi cho rang bang xep hang thuc te nen la:

1. de du doan duoc;
2. de rollback duoc;
3. de giai thich lai cho khan gia / doc gia duoc;
4. roi moi den benchmark va "cam giac nhanh".

Ket luan: ba cach "an ngan sach" khac nhau

• Codex an ngan sach theo cuong do session va muc do dung tools.
• Claude Code an ngan sach theo do dai hoi thoai, model va weekly cap dung chung.
• Phe Google an ngan sach theo daily requests, nhung ban phai theo sat migration path.

Neu ban khong phai ky su chuyen nghiep, bai toan dung khong phai "giai nao re nhat". Bai toan dung la:

Toi co hieu duoc cach cong cu nay het gioi han, reset va doi tien them nhu the nao truoc khi dua no vao lich lam viec moi tuan khong?

Trong bai sau, toi se bo qua bang gia va noi thang vao khuyen nghi theo tung kieu nguoi dung: creator, blogger, student, solo maker va nguoi build in public. Doc tiep: Khong phai ky su chuyen nghiep nen chon Codex, Claude Code hay Gemini?