DeepSeek
Pick DeepSeek for the price-performance of the API and the open weights, not for the chat app, which is a plain assistant without the connectors and workspace features the big consumer products now carry. For a developer paying per token it is hard to beat; for a company with data-residency rules the China-hosted service and PRC-law terms settle the question before quality does.
Pros
- Flash output at $1.20 per million tokens peak and $0.60 off-peak undercuts every Western frontier API by a wide margin
- Open-weight releases mean the models can be run locally or on any cloud, with no lock-in to the hosted service
- 1M-token context on both current models, with cached-input pricing that makes long agent loops cheap
- Chat app is free on web, iOS and Android with no tier to upgrade to
Cons
- Terms are governed by the law of mainland China and the operator is a Hangzhou company, which rules it out for many regulated buyers
- Peak and off-peak pricing by UTC window makes budgeting and benchmarking fiddly
- Concurrency caps (2,500 for Flash, 500 for V4-Pro) and periodic capacity squeezes hit production workloads
- The chat product trails ChatGPT, Gemini and Claude on connectors, projects and team features