Subscription vs. API: 7 AI Models Tested on 768 Prompts
I compared API costs with AI subscription plans using 768 prompts across seven models. See how many tasks you need to do before a plan pays off.
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A reader on X asked me a direct question: I compare models using API prices, but how much can you get done with a subscription? I ran the numbers using my own logs. I took 768 prompts from my October 24, 2026 test - Claude Opus 5.5, GPT-6 Astra, Gemini 4 Argon, Kimi K3.1 Pro, Qwen3.8 Max, GLM-5.3 and DeepSeek V4.1 Flash, across 12 task types in 10 languages - calculated the median cost per task using official pricing, then compared it with plan prices checked on the same day.
The short answer (as of October 24, 2026)
- For $20 in API usage, you get about 1,050 typical short tasks with Claude Opus 5.5 or about 1,175 with GPT-6 Astra. A $20 plan becomes cheaper only if you do more than 35-39 of these tasks every day for a month.
- With cheaper models, the break-even point rises to 81-155 tasks a day for Qwen, Kimi and Gemini 4 Argon, and 422-620 for GLM-5.3 and DeepSeek. For occasional use, API access is cheaper.
- A subscription can be a better deal for long conversations, large documents and agent workflows such as Claude Code and Codex. Claude Max 5x and 20x also include monthly API credits equal to the plan price.
How many messages do you get with a subscription?
I checked the plan pages and help centers for OpenAI, Anthropic, Google, xAI, Perplexity, Mistral and Kimi on October 24. None of the providers states a fixed number of messages included in its paid plans. Instead, they give multipliers and general descriptions:
- ChatGPT Plus displays “Limits apply” beside GPT-6. OpenAI’s help page describes reasoning limits without giving a number. Free and Go offer “unlimited” regular chats on GPT-5.6 Luna, subject to safeguards against abuse.
- Claude says there is “no set number of messages.” Pro offers at least five times as much usage as Free in a five-hour session; Max 5x and 20x offer five and 20 times as much as Pro, respectively, and also have a weekly limit.
- Gemini bases its limits on computing resources. Limits refresh every five hours, subject to a weekly cap, and Google AI Pro offers four times the free-tier limit.
- Grok lists multipliers relative to Plus: Premium 4x, Super 15x and Ultra 50x. Perplexity and Kimi say only “more” and “most.”
So I turned the question around. You can’t reliably say, “You can do 2,000 tasks on Plus,” but you can calculate how many of the same tasks you could buy through the API for the price of a plan. If you do fewer, the subscription costs more. If you do more, the subscription is cheaper - assuming its usage limits let you do that much.
How much does one task cost through the API?
The data comes from my 10-language test: drafting a letter to an authority, summarizing a news story, translating, writing a short piece of code, extracting data into JSON, proofreading, solving a logic puzzle and finding a detail in about 30,000 tokens of text. I ran everything through OpenRouter, set reasoning to medium and made one attempt per prompt. I calculated each request’s token cost using the provider’s standard pricing, checked on October 24, 2026, and compared it with my OpenRouter bill: 654 of 660 requests matched to the cent. “Typical short task” is the median across 11 categories, excluding the long-document task. The prompts and test were in Polish; the task descriptions here are translations of the original test material, not a new English-language test.
| Model (input/output price per 1 million tokens, USD) | Typical short task | Document of about 30,000 tokens | Short tasks for $20 |
|---|---|---|---|
| Claude Opus 5.5 (4 / 20) | $0.0190 | $0.1675 | 1,053 |
| GPT-6 Astra (10 / 50) | $0.0170 | $0.2368 | 1,175 |
| Qwen3.8 Max (2 / 6) | $0.0082 | $0.0549 | 2,431 |
| Kimi K3.1 Pro (2 / 10) | $0.0073 | $0.0617 | 2,724 |
| Gemini 4 Argon (2 / 10) | $0.0043 | $0.0541 | 4,658 |
| GLM-5.3 (1.4 / 4.4) | $0.0016 | $0.0387 | 12,665 |
| DeepSeek V4.1 Flash (0.3 / 1.2) | $0.0011 | $0.0087 | 18,604 |
Costs are shown in USD, excluding VAT. Two things stand out. Opus 5.5 has a lower rate than Astra but produces longer answers (a median of 876 output tokens compared with 294), so the cost per short task is similar. For a long document, the tokenizer makes a difference: Opus counted the same text as 39,700 tokens, Astra as 23,500 and Gemini as 25,300.
Break-even point: how many daily tasks make a plan cheaper?
The calculation is simple: divide the plan price by the cost of one task to find the number of tasks per month, then divide by 30 to get the daily break-even point.
$20 / $0.0190 = 1,053 tasks
1,053 / 30 days = 35 tasks per dayIn other words, if you do fewer than 35 short tasks a day with Claude Opus 5.5, the API costs less than the $20 Claude Pro plan. The same calculation applies to the other models and to plans costing $100 or $200:
| Model through the API | $20 plan | $100 plan | $200 plan |
|---|---|---|---|
| Claude Opus 5.5 | 35 per day | 175 per day | 351 per day |
| GPT-6 Astra | 39 per day | 196 per day | 392 per day |
| Qwen3.8 Max | 81 per day | 405 per day | 810 per day |
| Kimi K3.1 Pro | 91 per day | 454 per day | 908 per day |
| Gemini 4 Argon | 155 per day | 776 per day | 1,553 per day |
| GLM-5.3 | 422 per day | 2,111 per day | 4,222 per day |
| DeepSeek V4.1 Flash | 620 per day | 3,101 per day | 6,201 per day |
For documents of about 30,000 tokens, the break-even points are much lower: a $20 plan pays off at three such analyses a day with GPT-6 Astra, four with Opus, 11 with Kimi and 13 with Gemini 4 Argon. That’s the key point: subscriptions make sense when you put a lot of text into a chat, not simply when you ask questions frequently.
Three usage profiles (22 working days)
| Profile | Opus 5.5 through the API | GPT-6 Astra through the API | Gemini 4 Argon through the API |
|---|---|---|---|
| Light: 10 short tasks a day | $4.18 | $3.74 | $0.94 |
| Medium: 40 short tasks and 2 long documents a day | $24.09 | $25.39 | $6.16 |
| Heavy: 100 short tasks and 10 long documents a day | $78.64 | $89.52 | $21.33 |
The light profile costs only a few dollars a month through the API, compared with a $20 plan. The medium profile is roughly level with a $20 plan for Opus and Astra. The heavy profile costs more than $20 but stays under $100 - below the price of Claude Max 5x or ChatGPT Pro 100.
Subscription prices and what providers say about limits
Prices in USD are before tax; Anthropic and xAI explicitly say so. I compare pre-tax amounts. Local taxes and checkout prices vary by market, so check the provider’s pricing page for the price available to you.
| Plan | Monthly price | Provider’s stated limit |
|---|---|---|
| ChatGPT Go | $8 | “More messages” than Free; GPT-5.6 Luna; ads may appear |
| ChatGPT Plus | $20 | GPT-6 at Medium and High levels; “Limits apply” with no number; Astra only in Work and Codex |
| ChatGPT Pro 100 / 200 / 500 | $100 / $200 / $500 | GPT-6 Pro (Astra), with an unspecified weekly limit |
| Claude Pro | $20 ($17 with annual billing) | At least 5x Free per five-hour session, plus a weekly limit |
| Claude Max 5x / 20x | $100 / $200 | 5x or 20x Pro per session; $100 or $200 in API credits |
| Google AI Plus | See provider pricing | 2x the free limit; Flash model |
| Google AI Pro | See provider pricing | 4x the free limit; Gemini 4 Argon; 5 TB |
| Google AI Ultra | See provider pricing | 5x or 20x AI Pro |
| Grok Plus / Premium / Super / Ultra | $8 / $30 / $100 / $200 | 1x / 4x / 15x / 50x Plus |
| Perplexity Pro / Max | $20 / $200 | “More” and “most,” with no numbers |
| Mistral Pro | $14.99 | Up to 6x Free messages, 150 fast responses a day and API credits |
| Kimi Plus / Pro / Ultra | $19 / $39 / $199 | “Agent credits” multipliers, with no message count |
| DeepSeek (chat) | No paid plan | Does not publish limits |
Claude Max is the most interesting plan. According to Anthropic’s help page, Max 5x at $100 includes $100 in Claude API credits each month, while Max 20x at $200 includes $200. The conditions: you receive the credits after seven days on the plan; they go to one organization in Claude Console, do not roll over to the next month and do not work in interactive Claude Code. If you would spend $100 a month on Claude API anyway, Max 5x effectively gives you chat and Claude Code at no extra cost.
What can throw off the calculation?
My test used single prompts. Everyday work is different, so keep these points in mind before moving to the API.
- API conversations charge for history. Each new message sends the conversation so far back to the model. As an example calculation, not a measurement: 10 turns where the conversation history grows by 1,000 tokens per turn add up to 55,000 input tokens. That would cost about $0.40 with Opus 5.5, $0.70 with GPT-6 Astra and $0.15 with Gemini 4 Argon. Fifty such conversations with Opus would cost as much as Claude Pro.
- Agents use tokens in bulk. Claude Code and Codex read project files and call tools dozens of times for a single instruction. My test did not measure this. A subscription usually wins for agent-assisted coding, as I explained in Claude Code without a subscription.
- Reasoning tokens count as output. You pay for reasoning tokens at the same rate as regular text. The logic puzzle cost $0.0448 with Opus, more than twice as much as a typical task.
- Promotional prices expire. Gemini 4 Argon costs $2 / $10 through November 30, 2026, then $4 / $20 from December 1. The break-even point for Google AI Pro will then be cut in half.
- DeepSeek has peak and off-peak rates. I used the peak rate of $0.3 / $1.2. The price is half as much off-peak, including at weekends.
Who should choose a subscription, and who should use the API?
Choose a subscription if you
- have long conversations and return to the same threads throughout the day,
- upload contracts, reports and PDFs dozens of pages long, several times a day,
- code with an agent such as Claude Code, Codex or Antigravity,
- want a phone app, voice, search, image generation and memory without writing code,
- need a predictable monthly bill.
Choose the API if you
- ask a few or a dozen questions a day, but not every day,
- automate repeatable tasks such as descriptions, summaries and extracting data into JSON,
- want to mix models - DeepSeek or GLM for simple jobs, Opus for harder ones,
- want to avoid hitting a usage cap in the middle of a task,
- already have an API key and know how to use it, for example through a chat client or OpenRouter. My AI API beginner’s guide explains how to get started.
A sensible compromise, and the one I use, is one plan for everyday work with tools and the API for anything that can be automated.
More on AI plan and API prices
- Claude: Claude pricing, Claude API pricing, Claude Opus 5.5 pricing
- ChatGPT: ChatGPT and API pricing, Plus or Pro?, ChatGPT limits
- Gemini: Gemini plans and pricing, Gemini 4 Argon pricing, Google AI Ultra
- Other providers: Grok, Perplexity, Mistral, Kimi, Kimi K3.1 Pro API
More articles in this series - ChatGPT Plus versus the OpenAI API, Claude Pro and Max versus the API, Google AI Pro versus the Gemini API, the cheapest way to access Opus 5.5 and GPT-6 Astra, and free plans versus low-cost APIs - will be published from November 3 and will appear in the series cards on this page.
This is my Kimi referral link. Kimi says both parties receive a bonus when you buy a membership, at no extra cost to you.
Frequently asked questions
How many messages do you get with ChatGPT Plus or Claude Pro?
The providers do not say. OpenAI displays “Limits apply” for Plus, while Anthropic says there is no fixed message count and that usage depends on conversation length, model and features. You can see your limit in your account: in Claude, go to Settings and then Usage; in ChatGPT, a reset time appears when you reach a limit.
Is the API cheaper than a subscription?
For short, one-off tasks, yes - as long as you do fewer than about 35 a day with Opus 5.5 or about 39 with GPT-6 Astra. Subscriptions usually work out cheaper for long documents and long conversations.
How much does one Claude Opus 5.5 API request cost?
In my test, the median cost of a typical short task was $0.0190. A document of about 30,000 tokens cost $0.1675.
Is Claude Max a better deal than the API?
If you spend at least $100 a month on Claude API, it can be: Max 5x costs $100 and includes $100 in monthly API credits, plus chat and Claude Code with five times Pro’s usage. Credits do not roll over to the next month and do not work in interactive Claude Code.
Which model gives you the most tasks for $20?
Of the models I tested, DeepSeek V4.1 Flash gives you the most: about 18,600 typical short tasks at the peak rate. GLM-5.3 gives you about 12,700, and Gemini 4 Argon about 4,700.
Do these prices include tax?
The USD prices in this article are before tax. Local tax and checkout prices vary, so check the provider’s pricing page for the amount you would pay.
Google · Your sourcesQuantslant higher in your Google - one clickAdd to preferred sources →Sources and date checked
- ChatGPT plans and pricing - Free, Go, Plus, Pro and context windows (checked October 24, 2026)
- OpenAI Help: GPT-6 and other ChatGPT models - models and plan limits (checked October 24, 2026)
- OpenAI Help: Pro plans - Pro 100, 200 and 500 (checked October 24, 2026)
- OpenAI API pricing - GPT-6 Astra, GPT-6.1 Sol and Luna (checked October 24, 2026)
- Claude plans and API pricing - Pro, Max, Opus 5.5 and Sonnet 5.5 (checked October 24, 2026)
- Claude Help: Max plan - five-hour and weekly limits (checked October 24, 2026)
- Claude Help: API credits for Max and Team plans - terms (checked October 24, 2026)
- Gemini subscriptions (checked October 24, 2026)
- Gemini Help: models and limits - five-hour and weekly limits (checked October 24, 2026)
- Gemini API pricing - Gemini 4 Argon prices through November 30 and from December 1, 2026 (checked October 24, 2026)
- Grok plans - Plus, Premium, Super and Ultra (checked October 24, 2026)
- Perplexity Pro and Perplexity Max (checked October 24, 2026)
- Mistral pricing - Free, Pro and Team (checked October 24, 2026)
- Kimi memberships and Kimi API pricing (checked October 24, 2026)
- DeepSeek API pricing - peak and off-peak rates (checked October 24, 2026)
- Alibaba Cloud Model Studio: Qwen pricing (checked October 24, 2026)
- Z.ai: GLM pricing (checked October 24, 2026)
- Task costs: my October 24, 2026 test through OpenRouter, with 768 prompts, seven models and medians calculated using standard pricing
