# DeepSeek V4.1 Flash

> DeepSeek's successor to both V4 Flash and V4 Pro: 1M context, native image input, thinking and non-thinking modes. The lab routes V4 Pro onto it from 2026-09-14.

Human version: https://kymaapi.com/models/deepseek-v4.1-flash
Live JSON: `GET https://kymaapi.com/v1/models` (no auth required)

## Facts

- **Model ID**: `deepseek-v4.1-flash`: pass this as `model` in the request body
- **Creator**: DeepSeek
- **Released**: 2026-09-10
- **Context window**: 1M tokens
- **Max output**: 131K tokens per response, a hard ceiling, not a default
- **Price**: $0.27 in / $0.81 out per 1M
- **Capabilities**: tools, vision, reasoning

## Call it

```bash
curl https://kymaapi.com/v1/chat/completions \
  -H "Authorization: Bearer $KYMA_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "deepseek-v4.1-flash", "messages": [{"role": "user", "content": "Hello"}]}'
```

## Positioning

DeepSeek V4.1 Flash is the lab's current general model: a 1M-token context window, native image input and a thinking mode, at the Flash price band. DeepSeek positions it ahead of V4 Pro and routes V4 Pro requests onto it from 2026-09-14, so it is the DeepSeek id to pick for new work.

## About

DeepSeek released V4.1 Flash on 2026-09-10 as the successor to both V4 Flash and V4 Pro. Its card lists a 1M context window, thinking and non-thinking modes, JSON output, tool calls and image input. The lab's own note says its results land ahead of V4 Pro and that its KV cache needs a quarter of the memory of the previous generation.

On Kyma it is served through the OpenAI-compatible endpoint with automatic failover across three routes and exact cost reporting in the usage.cost field. Prompt caching is not exposed on the primary route, so every input token bills at the input rate.

The weights are published under the MIT license. The output cap on Kyma is 131,072 tokens per request.

## Use cases

- **Coding**, Tool calling and structured outputs with a 1M-token window put whole repositories in one request.
- **Vision at value pricing**, Image input on a Flash-priced model — screenshots, diagrams and documents without moving to a flagship.
- **Long-context analysis**, The 1M-token window takes document collections or long agent transcripts in a single call.
- **High-volume pipelines**, Flash-band pricing suits background jobs and batch processing that run thousands of times a day.

## Not ideal for

Prompt-cache-heavy workloads — the primary route publishes no cached-input rate, so repeated prefixes bill in full.

## Pick something else when

- You want the cheapest DeepSeek and can accept the previous checkpoint → `deepseek-v4-flash`
- You want the best general default overall → `qwen-3.6-plus`

## See also

- All models: https://kymaapi.com/models.md
- Pricing: https://kymaapi.com/pricing.md
- Other models by DeepSeek: https://kymaapi.com/models?q=DeepSeek