DeepSeek V4 Pro API pricing and setup
DeepSeek V4 Pro (deepseek-v4-pro) is a DeepSeek model. It is available through the relay.fast API with one relay.fast key and pay-as-you-go billing.
Prices checked from the live catalog. "From" is the lowest price among the relay.fast sources that currently serve the model. The price you pay depends on the source your request uses and can change on any day. The pricing page always shows current values.
| Official input price | $1.32 per 1M tokens |
|---|---|
| Official output price | $3.96 per 1M tokens |
| relay.fast input from | $0.066 per 1M tokens |
| relay.fast output from | $0.198 per 1M tokens |
| Cache read from | $0.0022 per 1M tokens |
| Lower than the official price by | up to 95% |
| Context window | 1M tokens |
| Endpoints | /v1/chat/completions |
price depends on the time of day; the peak-hours price is shown
Example request
Keep the key in the RELAY_FAST_API_KEY environment variable.
curl https://relay.fast/v1/chat/completions \
-H "Authorization: Bearer $RELAY_FAST_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model":"deepseek-v4-pro","messages":[{"role":"user","content":"Hello"}]}'Use DeepSeek V4 Pro in coding tools
Setup guides: Claude Code, Codex, Cursor, Cline, Kilo Code, OpenCode, Aider. The API docs have one-command installers.
Frequently asked questions
How much does the DeepSeek V4 Pro API cost?
On 2026-11-05, relay.fast charges from $0.066 per 1M input tokens and $0.198 per 1M output tokens for DeepSeek V4 Pro, against the official $1.32 and $3.96. The price depends on the source your request uses and can change; https://relay.fast/pricing/deepseek-v4-pro shows the current value.
What is the context window of DeepSeek V4 Pro?
DeepSeek V4 Pro accepts up to 1M tokens of context in the relay.fast catalog. Output limits depend on the model and client settings.
Which API endpoint does DeepSeek V4 Pro use?
Call /v1/chat/completions with a relay.fast API key. OpenAI-compatible SDKs use the base URL https://relay.fast/v1.
Do I need a DeepSeek account to use DeepSeek V4 Pro?
No. You use a relay.fast account and API key. relay.fast is an independent API gateway and is not affiliated with DeepSeek.
Other DeepSeek models
DeepSeek V4 Flash · DeepSeek V4 Flash 0731 · DeepSeek V4 Flash Vision Exp · DeepSeek V4 Pro 0813 · DeepSeek V4.1 Flash · DeepSeek V4.1 Flash 1017