# Models & API compatibility Choose the right model ID and API format for your application. ## Match your client to an API An endpoint supporting one format does not necessarily support the others. Confirm support before configuring a coding tool. | Client | Required format | Typical request path | | --- | --- | --- | | OpenAI SDK examples in this guide | Chat Completions | `/chat/completions` | | OpenCode custom provider in this guide | Chat Completions | `/chat/completions` | | Claude Code | Anthropic Messages | `/messages` relative to its Anthropic base | | Codex | Responses | `/responses` | Use the exact API base supplied by your provider. Do not append `/chat/completions` to an SDK's base URL: the SDK adds the request path. ## Choose a model ID The official DeepSeek documentation currently lists `deepseek-flash` and `deepseek-v4-pro`. These are official API identifiers, not a promise that every independent service offers both models. DS-sub's model list has not been published. A plan called Pro, Max, Pro Max or Ultra describes a subscription tier. It is not a model ID. In particular, a Pro plan does not imply access to the `deepseek-v4-pro` model. ## DeepSeek V4.1 Flash The official API uses `deepseek-flash` for the current Flash model. The model family name shown in a client can differ from the identifier sent in a request. Check your provider's supported IDs before configuring it. ## DeepSeek V4 Pro The official API uses `deepseek-v4-pro`. Availability, enabled capabilities and billing through an independent provider must be checked with that provider. A subscription tier named Pro does not select this model automatically. ## Check capabilities before enabling them Confirm support for streaming, tools, structured output, images and reasoning settings separately. Start with a small text request; add optional parameters one at a time. Context limits and output limits depend on the model and provider. Do not copy a context size or model alias from another provider into your coding assistant. Incorrect metadata can cause rejected requests or premature context compaction. ## Compare billing separately Official API pricing is usage based. Subscription allowances and reward points follow the rules of their issuing service. Cached-input pricing on the official API does not automatically translate into the same discount on a subscription. See [pricing comparison](https://deepseeksub.com/compare/index.md), [plan usage](https://deepseeksub.com/docs/usage-limits/index.md), and the [official models and pricing reference](https://api-docs.deepseek.com/quick_start/pricing/). Verify current rates before estimating cost. --- HTML source: [Models & API compatibility — DeepSeek Subscription Tutorials](https://deepseeksub.com/docs/models/)