Grok vs Qwen vs DeepSeek vs ChatGPT: The Real Cost in 2026

The cheapest AI depends on what you buy. A monthly chat plan pays for an interface and its usage allowance; an API bill pays for tokens and sometimes tools. Comparing a $20 subscription with a $0.10-per-million-token API rate as if they were alternatives is a category error. Here is a September 25, 2026 price snapshot, followed by workloads that show where the low headline price holds up and where it does not.

For a person using chat, what is the monthly bill?

These are published US-dollar prices, not a promise of the same checkout total in every country or app store. Official references: xAI plans, X Premium, xAI usage rules, Qwen Studio, DeepSeek's official app, ChatGPT plans, Go launch pricing, Plus pricing, and Pro tier availability.

Consumer decision: If the free interface handles your daily questions, the lowest cost is $0. Pay for the specific feature or capacity you actually hit: Grok's higher shared usage pool, ChatGPT's paid features, or another provider's workflow. Qwen and DeepSeek's free chat offers do not prove that their API is free. No provider publishes a single fixed prompt count that makes all four free plans directly comparable.

For an app developer, compare the same billing unit

The table shows standard, uncached USD list rates per one million input and output tokens, excluding tool calls, taxes and regional processing surcharges. xAI rates are for its global endpoint. Alibaba's Singapore/International and Global scopes have different published rates. DeepSeek's UTC peak period has a separate price. These models occupy different capability tiers; a cheaper token is not evidence of equal answer quality.

Official rate cards: Alibaba Model Studio pricing, Alibaba deployment regions, DeepSeek pricing, xAI developer pricing, and OpenAI API pricing.

Example 1: a short, repeatable API task

Assume 10,000 uncached input tokens and 2,000 output tokens per request, with no tools, search calls, batch discount or taxes. The calculation is 0.01 x input rate + 0.002 x output rate because the table rates are per million tokens.

At these published rates, Alibaba Global Qwen3.8-Flash is the lowest bill for this specific token mix, if it is available in the selected deployment scope. GPT-6 Luna is close. Move the same Qwen workload to Singapore/International and its list-price bill rises by about 29%; run the DeepSeek workload entirely in its peak window and that bill doubles. Neither price result says which model produces acceptable answers for your application. Test output quality and retry rates before extrapolating to production.

For a higher-priced model on the same short request, DeepSeek V4 Pro costs $0.01056 off peak or $0.02112 at peak; Qwen3.8-Max costs $0.026402 in Global or $0.032 in Singapore/International; Grok 4.7 costs $0.032; GPT-6 Sol costs $0.04. These are cost comparisons, not claims that the models are interchangeable.

Example 2: one long request changes the rate card

Consider 300,000 uncached input tokens and 20,000 output tokens in one request. The input size matters because some providers price the entire request in a higher tier once a threshold is crossed. At published standard rates, DeepSeek V4.1 Flash is $0.057 off peak or $0.114 at peak; GPT-6 Luna is $0.075 after its over-272K prompt multiplier; Qwen3.8-Max is $0.72 in Singapore/International; and Grok 4.7 is $1.44 at its 200K-plus rate. Qwen3.7-Plus in Singapore/International is $0.456 at its over-256K input tier. This is not an equal-quality shortlist; it shows why applying a short-request unit price to a long prompt can understate the bill.

Context limits, model availability, output caps and tool behavior must also fit your actual task. See Grok subscription and API pricing and the separate Grok/SuperGrok bundle comparison, plus the Qwen region and cache rules and DeepSeek cache and peak-hour rates before using the example as a budget.

Example 3: what happens at volume?

For a month of many short requests totaling 400 million uncached input tokens and 100 million output tokens, the simple token-only estimates are $83.40 for Qwen3.8-Flash Global, $90 for GPT-6 Luna, $107 for Qwen3.8-Flash Singapore/International, $120 for DeepSeek V4.1 Flash off peak or $240 if all usage fell in peak windows, and $600 for Grok Build 0.1 global. The calculation is 400 x input rate + 100 x output rate; it assumes each request stays below any higher context-price threshold. Retry traffic, cached-token eligibility, paid tools, data transfer, regional uplifts and account-level discounts can change the realized invoice.

If your product calls a search engine, that cost is separate. Perplexity's Search API, for example, prices standard successful requests at $5 per 1,000, regardless of which chat subscription you pay for. A workflow that makes one such request for each of 10,000 answers adds $50 before any model tokens. The Perplexity free, paid and API guide explains that separate bill.

Where the apparent cheapest option stops being cheapest

• Region: Alibaba's Global and Singapore/International rates differ for the same named Qwen model, and each region has its own endpoint and API key. The lowest published regional price is useful only if your chosen deployment permits the model and meets your data requirements. Alibaba documents both regional pricing and endpoint differences.
• Time of use and caching: DeepSeek's price card separates UTC peak from off peak and cache-hit from cache-miss input. Cache hits require a reusable matching prefix; they are not guaranteed on every call.
• Long context: xAI, OpenAI and some Alibaba models change rates above request-size thresholds. Do not multiply a long request by only the lowest tier.
• Access rights: A consumer subscription does not replace API billing. Likewise, the free Qwen Studio and DeepSeek app offers cannot be used as a zero-dollar API budget.
• Usability: A cheap model that requires retries, longer prompts or a second model to repair its output may cost more per accepted result. Measure your own accepted-answer rate; no cross-provider quality benchmark is implied by these price tables.

Bottom line: For casual chat, try the free interfaces and upgrade for a demonstrated limit or feature. For short API tasks, Qwen3.8-Flash Global and GPT-6 Luna are the lowest published token bills in the example, subject to region and task quality. DeepSeek's bill depends heavily on UTC timing and cache behavior. Grok's subscription value cannot be inferred from its API rate, and a long Grok 4.7 request can cost much more than its short-context headline implies. There is no universal cheapest provider across consumer access, development, long context and search-heavy workflows.