COMPARISON · Last verified: September 2026

DeepSeek vs Perplexity AI

A free chatbot with a low-cost model API against a cited answer engine, compared on verified prices, features and fit.

Perplexity: official demo

Watch Perplexity's official video, Perplexity Assistant for Android, before you decide.

Perplexity

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Official video via YouTube (Perplexity), embedded for reference. ToolChase does not host or claim this video.

What is DeepSeek?

DeepSeek is an AI model maker and chatbot operated by Hangzhou DeepSeek Artificial Intelligence Co., Ltd. Its chat assistant runs on the web at chat.deepseek.com and in iOS and Android apps, which its App Store and Google Play listings describe as free; you sign in with an account, and the chat has DeepThink and Search options. Developers pay for the API per token from a prepaid balance. As of September 2026 it serves deepseek-flash (DeepSeek-V4.1-Flash) and deepseek-v4-pro (DeepSeek-V4-Pro). Both list a 1M-token context and up to 384K output tokens, and the API accepts OpenAI- and Anthropic-format requests, so tools such as Claude Code, GitHub Copilot and OpenCode can use DeepSeek as their backend model. DeepSeek also publishes its V4-family weights on Hugging Face: the V4.1-Flash model card says the repository and the model weights are licensed under the MIT License. DeepSeek says it collects, processes and stores personal data in the People's Republic of China.

What is Perplexity?

Perplexity is an AI answer engine from Perplexity AI, Inc. You ask a question and it answers from a real-time web search, with numbered inline citations that link to the original sources. It orchestrates several models and picks one per query, including ChatGPT, Google Gemini, Anthropic Claude and NVIDIA Nemotron, and it has its own in-house model, Sonar; Pro and Max subscribers can select a preferred model, such as GPT-5.6 Terra or Claude Sonnet 5. It also offers Pro Search, a Research mode that writes in-depth reports, and Create files and apps, which builds reports, spreadsheets, dashboards and simple web apps. Pro and Max add premium sources such as PitchBook, Statista and S&P Capital IQ. Its Computer agent normally runs multi-step tasks in a secure cloud sandbox, connects to apps such as Gmail, Outlook, GitHub, Slack and Notion, and can run jobs on a schedule. Perplexity also makes Comet, an AI browser for Mac, Windows, iOS and Android, and sells a pay-as-you-go developer API.

Key differences at a glance

Both answer questions in a chat box, and both are free to start. The differences that matter most are these:

• -- Where answers come from: Perplexity is built around real-time web search and cites sources inline in every answer; DeepSeek answers from its own models, with a Search option in its chat app.
• -- How you pay: DeepSeek's chat app is free and its API is billed per token from a prepaid balance; Perplexity pairs a Free plan with Pro ($20/mo), Max ($200/mo) and per-seat Enterprise plans.
• -- Models: DeepSeek serves its own V4.1-Flash and V4-Pro; Perplexity picks a model per query from several providers and lets Pro and Max subscribers choose one.
• -- Open weights: DeepSeek publishes its V4-family weights on Hugging Face under the MIT License, so you can run them yourself.
• -- Developer API: DeepSeek sells its own models by the token; Perplexity's Agent API offers models from OpenAI, Anthropic, Google, xAI and others at the providers' rates with no markup, plus web search as a tool at $0.0025 per call.
• -- Your data: DeepSeek stores personal data in China and lets you opt out of model improvement; Perplexity lets you opt out of AI training and says Enterprise and API data is never used for training.
• -- Score: both rate 4.7/5 in our reviews, a tie.

Feature-by-feature comparison

Here is how DeepSeek and Perplexity compare on the points that shape daily use and API builds:

Pricing comparison

DeepSeek's App Store and Google Play listings describe its chat assistant as free. For developers, it sells API access: you top up a prepaid balance that does not expire, and usage is deducted per token. deepseek-flash costs $0.15 per million input tokens on a cache miss, $0.003 on a cache hit and $0.60 per million output tokens off-peak; deepseek-v4-pro costs $0.66, $0.022 and $1.98. Peak rates are double and apply 01:00 to 04:00 and 06:00 to 10:00 UTC, Monday through Friday, excluding Chinese public holidays. DeepSeek's FAQ says there is one pricing standard with no tiered plans, and higher rate limits are available on request at no extra cost.

Perplexity's Free plan includes practically unlimited basic searches, 3 Pro Searches a day, 1 Research query a month and limited file uploads. Pro is $20 a month, or $17 a month billed annually, for personal use: it raises the Pro Search, Research and upload limits and adds model choice, image and video generation, Create files and apps, and premium sources. Max is $200 a month or $2,000 a year (annual billing on the web only), with the highest usage limits and 10,000 Computer credits a month. Enterprise Pro is $40 per seat per month or $400 per seat per year, and Enterprise Max is $325 per seat per month or $3,250 per seat per year. API usage is billed separately from every plan.

What the entry paid plan buys: Perplexity Pro mainly buys more and deeper research, a model of your choice and premium sources. It includes no monthly Computer credits beyond a limited-time sign-up bonus; extra credits cost $1 per 100, and Ask searches do not use them. At DeepSeek, the entry cost is whatever you top up for the API.

Worked example: five people who want cited research pay 5 × $40 = $200 a month for Perplexity Enterprise Pro, or 5 × $400 = $2,000 a year billed annually; DeepSeek's chat app costs them nothing. An internal tool that sends 100 million input tokens and receives 20 million output tokens a month, with no cache hits, costs $27 on deepseek-flash off-peak (100 × $0.15 + 20 × $0.60) or $54 at peak. Through Perplexity's Agent API the same volume costs $25 on GLM-5.3 Flash (100 × $0.15 + 20 × $0.50) or $75 on Sonar (100 × $0.25 + 20 × $2.50), plus $0.0025 per web search: 10,000 searches add $25.

Bottom Line

DeepSeek and Perplexity tie at 4.7/5 in our reviews and suit different jobs. Perplexity is the pick when answers must come from the current web with sources you can check: citations come with every answer, the free plan covers practically unlimited basic searches, and Pro at $20 a month adds deeper research, model choice and premium sources. DeepSeek is the pick when you want a capable model for little or no money, or under your own control: the chat app is free, deepseek-flash lists $0.15 per million input tokens off-peak, and the MIT license lets you run the weights yourself.

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