Start with the DeepSeek API guide for setup, current model IDs, pricing, Responses API support, runnable code examples, and dated live verification. Then use the specialist guides below for SDKs, features, integrations, testing, and production operations.
The guides prioritize first-party documentation and distinguish documented behavior from dated, account-specific observations. When a page includes original testing, credentials, balances, identifiers, and sensitive response data are removed or masked. A successful example demonstrates the tested request under stated conditions; it does not guarantee future availability, identical latency, or the same account limits.
Keep API keys on trusted servers, validate model output and tool arguments, control retries and spending, and test against your own requirements before deployment. Chat-Deep.ai is independent and is not affiliated with or endorsed by DeepSeek.
Last verified: August 24, 2026. DeepSeek A/B testing is the controlled comparison of two production configurations—such as prompts, model IDs, thinking settings, retrieval versions, image-input policies, or tool policies—to…
In this controlled DeepSeek coding benchmark, deepseek-v4-pro produced five safely extractable programs and all five passed every test. deepseek-v4-flash produced two safely extractable programs, both of which passed every…
Track DeepSeek API updates, current V4 model IDs, deprecated and unlisted aliases, pricing and contract changes, plus dated compatibility checks and migration guidance.
Pricing snapshot notice: Historical results and costs on this page are frozen to the price snapshot used at test time and have not been recalculated. Traffic billed from 2026-08-16…
Pricing snapshot notice: Historical results and costs on this page are frozen to the price snapshot used at test time and have not been recalculated. Traffic billed from 2026-08-16…
Live test: July 25, 2026 | Official endpoint | Three privacy-safe requests | All monetary values redacted The DeepSeek API balance endpoint is GET Send a DeepSeek API…
Pricing snapshot notice: Historical results and costs on this page are frozen to the price snapshot used at test time and have not been recalculated. Traffic billed from 2026-08-16…
Use DeepSeek user_id across Flash, Pro, and Vision Exp: account concurrency, 512-character rules, tenant-bound file_id controls, cache isolation, and logs.
Pricing snapshot notice: Historical results and costs on this page are frozen to the price snapshot used at test time and have not been recalculated. Traffic billed from 2026-08-16…
Pricing snapshot notice: Historical results and costs on this page are frozen to the price snapshot used at test time and have not been recalculated. Traffic billed from 2026-08-16…
A source-backed explanation of DeepSeek V4's MoE, CSA/HCA hybrid attention, mHC residual design, 1M-token context, and agent training, paired with live API tests up to 847,423 input tokens.
Learn DeepSeek API testing with mocked Node.js fixtures, streaming and error regressions, and a separate bounded live smoke test. The local suite runs without credentials; live evidence is dated, sanitized, and reproducible.
DeepSeek finish_reason tells an application why a Chat Completions response stopped and what it should do next. The official OpenAI-compatible API documents five terminal values: stop, length, content_filter, tool_calls,…
DeepSeek’s three current hosted V4 model IDs—deepseek-v4-flash, deepseek-v4-pro, and the experimental multimodal deepseek-v4-flash-vision-exp—each list a 1,000,000-token context length and a 384,000-token maximum output. Prompt and generated completion share that…
The DeepSeek API now accepts image input through the experimental deepseek-v4-flash-vision-exp model. It can analyze screenshots, charts, photographs, scanned pages, and other supported images supplied by public URL, Base64…
The DeepSeek Files API is now live for image uploads. You can upload JPEG, PNG, GIF, or WebP, receive a reusable file_id, and reference it with the experimental deepseek-v4-flash-vision-exp…
The DeepSeek web search API question depends on the endpoint. The current Responses API has a provider-executed web_search tool, while the OpenAI-compatible Chat Completions endpoint still exposes caller-executed function…
A DeepSeek API timeout can be a client deadline, idle-read limit, proxy cutoff, runtime limit, or DeepSeek closing a request that has not begun inference. The fix depends on…
To migrate deepseek-chat to DeepSeek V4 without changing its behavior, use deepseek-v4-flash and explicitly disable thinking. To migrate deepseek-reasoner, use deepseek-v4-flash and explicitly enable thinking. Cutoff status: DeepSeek’s April…
DeepSeek Anthropic API compatibility lets an Anthropic Messages client call DeepSeek by changing the SDK base URL, API key, and model value—but it is not full Claude feature parity.…
DeepSeek token usage is returned in different field shapes across Chat Completions, the Responses API, and the Anthropic-compatible Messages API. This guide separates those contracts, shows how automatic context-cache…
Build secure iOS and Android DeepSeek features through a backend, with Vision uploads, tenant-bound file_id, streaming, rate limits and key safety.
A DeepSeek Vector Database usually means a RAG architecture where DeepSeek is the LLM that generates the answer, while a separate vector database stores and retrieves embeddings. DeepSeek’s official…
Current API layer verified: August 24, 2026. This guide defines a DeepSeek evaluation framework for applications that call the DeepSeek API. It is an application-authored testing pattern, not an…
Pricing snapshot notice: Historical results and costs on this page are frozen to the price snapshot used at test time and have not been recalculated. Traffic billed from 2026-08-16…
A practical, independently tested guide to creating and securing a DeepSeek API key, with live authentication, rotation, revocation, and leak-prevention checks.
DeepSeek API limits: Pro 500, Flash 2,500, and Vision Exp 2,500 concurrent requests per account and model, plus 429, safe queues, retries, and dated tests.
Live test date: July 27, 2026 (UTC). The OpenAI SDK with DeepSeek can act as an HTTP client for the provider’s documented OpenAI-format Models and Chat Completions endpoints in…
Original DeepSeek JSON Output tests across V4 Flash and Pro, covering response_format, thinking, prompt controls, truncation, streaming, JSON parsing, and local schema validation.
A source-audited DeepSeek Node.js and TypeScript guide with compile-safe Chat Completions, thinking, streaming, JSON validation, tool loops, cancellation, retries, errors, usage, and bounded original tests.
Current package and provider review: August 24, 2026. A current DeepSeek LlamaIndex integration uses the Python package llama-index-llms-deepseek and the class DeepSeek. Keep DEEPSEEK_API_KEY on the server, use an…
Documentation review date: August 24, 2026. For direct REST API calls, install the official openai package and configure OpenAI or AsyncOpenAI with base_url=””. DeepSeek’s current Models & Pricing page…
A Python-first DeepSeek LangChain integration guide with a concise TypeScript path, covering explicit thinking modes, streaming, structured output, tools, agents, RAG, retries, tests, and production safeguards.
Live test date: July 27, 2026 (UTC). DeepSeek Tool Calls let a model request an external function, but the model does not execute that function. Your application receives the…
DeepSeek context caching can make repeated API input dramatically cheaper, but a shared prefix is not a guarantee of an immediate cache hit. In our live test, an exact-extension…
DeepSeek Thinking Mode is enabled by default on deepseek-v4-flash, deepseek-v4-pro, and deepseek-v4-flash-vision-exp. You can control it with {“thinking”:{“type”:”enabled”}} or {“thinking”:{“type”:”disabled”}}. When thinking is enabled, the API returns private reasoning…
DeepSeek API error codes are easiest to fix when you separate the HTTP status from the response body and from any failure raised by your own client. DeepSeek officially…
The DeepSeek API uses the OpenAI-compatible base URL Its current V4 API catalog has three IDs: text-only deepseek-v4-flash and deepseek-v4-pro, plus the experimental multimodal deepseek-v4-flash-vision-exp for image understanding.…