NT$0/month, open to everyone. The official site lists the free-tier limits one by one: limited access to GPT-5.5 Instant, limited messages and uploads, limited and slower image generation, limited deep research, limited memory and context, limited Codex, limited ChatGPT Work desktop app. The only place the official site gives concrete numbers is the plan comparison table: free-tier GPT Instant total context window 27K (Go/Plus 54K, Pro 128K); free-tier single-input cap about 12 pages of text (Go/Plus about 40 pages, Pro about 250 pages); the context window for reasoning models is marked depends on the situation for the free tier (Go/Plus 256K, Pro 400K). Response time on the free tier is marked as limited by system resources and service conditions; only paid plans are fast. Chat history is unlimited on the free tier. Whether content is used for model training can be opted out of. The official site has never published a concrete messages-per-day figure, and this site does not fill in an estimate. (Read directly from chatgpt.com/zh-Hant/pricing over a Taiwan connection on 2026-08-09)
US$0: 40 standard-model uses per day on a shared quota across Claude 4.5 Haiku / Gemini 3.1 Flash-Lite / GPT-5.4 mini, limited trial of image and video generation, limited trial of ChatPDF, time-limited AI Agent trial, up to 3 logged-in devices (read directly in a browser from the Traditional Chinese monica.im/pricing on 2026-08-09)
Cheapest paid plan: US$8.3 / mo（Annual plan (monthly avg.)）
Only adds capacity, not features. | 🇹🇼 Actual Taiwan list price NT$270/month (read directly from the Traditional Chinese official site via a Taiwan connection on 2026-08-09, not a USD exchange-rate conversion, logged separately per rule 10.5).
Plus
US$20 / mo
| 🇹🇼 Actual Taiwan list price NT$690/month (checked 2026-08-09 via a Taiwan connection reading the official Traditional Chinese site directly — not a USD exchange-rate conversion, recorded separately per 10.5)
Pro
US$100 / mo
A third-party source mentioned that a lower-tier Pro plan was added in April 2026, but this has not been directly confirmed on the official website; ⚠️as of 2026-07-26, the official website agent (r.jina.ai) shows the official description as a single "Pro: From US$100/month, 5x or 20x more usage", without any mention of "Pro Max", and it remains to be manually reviewed whether this Pro/Pro Max two-tier model should be merged into a single Pro plan (with 5x/20x usage options) ｜🇹🇼 The actual price in Taiwan is NT$3300/month (as of 2026-08-09, directly read from the official website's Traditional Chinese version in Taiwan, not converted from USD, recorded with a decimal point of 10.5)
Pro Max
US$200 / mo
The original database's US$200 Pro plan currently coexists with a lower-level Pro plan (from a third-party source, not directly confirmed on the official website); ⚠️as of 2026-07-26, the official website's proxy capture did not show "Pro Max" as an official name, possibly fabricated by a third party or actually referring to the 20x usage option of the Pro plan, pending manual review
Business
US$25 / user / mo（5 user ≈ US$125/mo）
Self-serve enterprise plan, per user/month (from third-party sources, not directly confirmed on the official website); as of 2026-07-26, a secondary source (help.openai.com summary) states that the actual price is US$20/person/month billed annually or US$25/person/month billed monthly (with a minimum of 2 people), not directly confirmed on the official website
Monica
Plan
Price
What you get
Pro
US$8.3 / mo（Annual plan (monthly avg.)）
US$99/year billed annually (about US$8.3/month); 5,000 base-model messages + 200 advanced-model messages per month, 1,500 premium credits, 5 devices. The official site doesn't display a monthly-billed list price (2026-08-09 tested: the toggle switch had no effect)
Max
US$16.6 / mo（Annual plan (monthly avg.)）
US$199/year billed annually (≈ US$16.6/month), a limited-time 33% off, list price US$299/year; unlimited use of standard + premium models, 4,500 premium credits, 5 devices. Formerly named Unlimited; officially still marked as in beta. Monthly list price not shown on the official site
Ultra
US$82.9 / mo（Annual plan (monthly avg.)）
Annual billing US$995/year (≈US$82.9/month), 17% savings with annual billing; unlimited use of standard + advanced models, 20,000 advanced points, 10 devices. The monthly list price is not shown on the official site
Which one should you pick?
Both offer a free plan. Compare paid tiers against your needs.
Monica has no public paid plan; ChatGPT starts at about US$8 / mo.
FAQ
Is there a free version of ChatGPT?
Yes. NT$0/month, open to everyone. The official site lists the free-tier limits one by one: limited access to GPT-5.5 Instant, limited messages and uploads, limited and slower image generation, limited deep research, limited memory and context, limited Codex, limited ChatGPT Work desktop app. The only place the official site gives concrete numbers is the plan comparison table: free-tier GPT Instant total context window 27K (Go/Plus 54K, Pro 128K); free-tier single-input cap about 12 pages of text (Go/Plus about 40 pages, Pro about 250 pages); the context window for reasoning models is marked depends on the situation for the free tier (Go/Plus 256K, Pro 400K). Response time on the free tier is marked as limited by system resources and service conditions; only paid plans are fast. Chat history is unlimited on the free tier. Whether content is used for model training can be opted out of. The official site has never published a concrete messages-per-day figure, and this site does not fill in an estimate. (Read directly from chatgpt.com/zh-Hant/pricing over a Taiwan connection on 2026-08-09)
How much does ChatGPT cost?
The cheapest is the plan from ChatGPT named Go, at about US$8 / mo.
Does ChatGPT support Chinese?
ChatGPT offers full Chinese interface support.
Is there a free version of Monica?
Yes. US$0: 40 standard-model uses per day on a shared quota across Claude 4.5 Haiku / Gemini 3.1 Flash-Lite / GPT-5.4 mini, limited trial of image and video generation, limited trial of ChatPDF, time-limited AI Agent trial, up to 3 logged-in devices (read directly in a browser from the Traditional Chinese monica.im/pricing on 2026-08-09)
How much does Monica cost?
The cheapest is the plan from Monica named Pro, at about US$8.3 / mo（Annual plan (monthly avg.)）.
Does Monica support Chinese?
Monica offers full Chinese interface support.
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