ChatGPT vs DeepSeek

When to pick ChatGPT

• You need one assistant that covers everything — Deep Research with cited synthesis, DALL-E image generation, Sora video, Advanced Voice, and Agent Mode — without stitching together multiple specialist tools.
• You want a managed, US-hosted service with enterprise guarantees: the Business plan ($20/seat/month annually) excludes your data from model training and adds SAML SSO and SOC 2 Type II.
• You value a mature ecosystem — the GPT Store, plugins, and a free entry point that, while rate-limited, lets you evaluate the GPT-5 family before paying $20/month for Plus.

When to pick DeepSeek

• You want capable AI chat for free with no feature paywall — the web app and mobile app are unlimited (throttled only at peak), versus ChatGPT’s 10 messages per 5 hours on the free tier.
• You are building on an API and need to minimize spend: V4 Flash costs $0.14/M input tokens — a fraction of comparable frontier APIs — with a 1M-token context window included at standard rates.
• You need self-hosting for data control: DeepSeek publishes open model weights, so teams with strict residency rules can run it on private infrastructure.

Bottom line

DeepSeek and ChatGPT solve different problems. DeepSeek wins on raw cost and context: free unlimited web chat, an API from $0.14/M input tokens, and a 1M-token window on every model — ideal for developers minimizing spend and for anyone who wants a free daily driver. ChatGPT wins on breadth and trust: a single $20/month Plus subscription spans voice, image, video, and cited Deep Research, and its US-based hosting with Business-tier data exclusion fits regulated teams that cannot send data to servers in China. Choose DeepSeek to cut cost and process long documents; choose ChatGPT when you need multimodal range and enterprise data guarantees in one tool.