# DeepSeek V4 Flash 0423 — API, capabilities & pricing | Y-API

> DeepSeek V4 Flash 0423 is the earlier, text-only Flash entry in the V4 family. Its sparse mixture-of-experts design targets coding and conversation workloads with a long context window; it is distinct from the later 0731 revision.

This is the markdown representation of https://y-api.bestvirtualgoods.com/models/deepseek/deepseek-v4-flash. Generated by `scripts/generate-seo-assets.mjs` from the same copy the page renders — do not edit by hand.

Model ID: `deepseek/deepseek-v4-flash`

Sources reviewed: 2026-10-04. Y-API catalog snapshot: 2026-10-04.

## Choosing this model

Selection advice by Y-API. The checks below are suggested evaluations, not published test results.

### Where to start

Use it as a baseline for support-ticket classification, text cleanup and small code explanations. Keep a set of difficult examples before deciding whether to move the workload to a newer Flash revision.

### What to watch for

The unsuffixed API ID is not a promise to follow the latest Flash model. OpenRouter labels this entry 0423. Do not assume it gains the image input or behavior of V4.1 Flash.

## Model specifications

These are OpenRouter model-level specifications, not a Y-API compatibility test. A particular route may accept fewer input formats, parameters or tokens. Verify the features you need with a small request; a successful text response does not validate vision or tool calling.

| Field | Value |
| --- | --- |
| Context window | 1,048,576 tokens |
| Input | Text |
| Output | Text |
| Listed on OpenRouter | 2026-04-24 |
| Parameters listed by OpenRouter | `frequency_penalty`, `include_reasoning`, `logit_bias`, `logprobs`, `max_completion_tokens`, `max_tokens`, `min_p`, `presence_penalty`, `reasoning`, `reasoning_effort`, `repetition_penalty`, `response_format`, `seed`, `stop`, `structured_outputs`, `temperature`, `tool_choice`, `tools`, `top_a`, `top_k`, `top_logprobs`, `top_p` |

## Estimate your cost

The current catalog marks this model as free: calls do not deduct credit. This does not promise unlimited capacity, permanent availability or a future free price.

$1 paid adds $10 of credit. Cash equivalent = credit consumed ÷ 10; this is not the model publisher’s list price.

Input tokens / request: 1000. Output tokens / request: 500. Number of requests: 1000.

Estimated credit consumed: Free — no credit deducted. Estimated cash equivalent: Free — no credit deducted.

Illustrative token budget, not measured usage or a quote. Includes input and output; excludes separate media charges, cache discounts and retries. Include billed reasoning tokens in your output budget where applicable. Actual billing follows usage returned by the service.

### Same token budget, different models

| Model | Estimated credit consumed | Estimated cash equivalent |
| --- | --- | --- |
| [DeepSeek V4 Flash 0423](https://y-api.bestvirtualgoods.com/models/deepseek/deepseek-v4-flash) | Free — no credit deducted | Free — no credit deducted |
| [DeepSeek V4 Flash 0731](https://y-api.bestvirtualgoods.com/models/deepseek/deepseek-v4-flash-0731) | $0.30 | $0.03 |
| [DeepSeek V4.1 Flash](https://y-api.bestvirtualgoods.com/models/deepseek/deepseek-v4.1-flash) | $0.70 | $0.07 |

## Use the API

These minimal, text-only requests use the exact Y-API model ID. They do not demonstrate image, audio, video, file or tool support. The output limit also needs room for reasoning; an empty answer with finish_reason=length can mean the budget was exhausted.

Set the TOKEN environment variable to a key from your console. Run this on your server or locally; never expose a key in browser code or a public repository.

### A task to try

Classify this ticket as billing, login or bug. Give one reason: I was charged twice for the same invoice.

```bash
curl --fail-with-body --silent --show-error --max-time 120 \
  'https://api.y-api.bestvirtualgoods.com/v1/chat/completions' \
  -H "Authorization: Bearer ${TOKEN:?Set TOKEN first}" \
  -H 'Content-Type: application/json' \
  --data-binary @- <<'JSON'
{
  "model": "deepseek/deepseek-v4-flash",
  "messages": [
    {
      "role": "user",
      "content": "Classify this ticket as billing, login or bug. Give one reason: I was charged twice for the same invoice."
    }
  ],
  "max_tokens": 4096
}
JSON
```

```python
import json
import os
import sys
import urllib.error
import urllib.request

payload = {
  "model": "deepseek/deepseek-v4-flash",
  "messages": [
    {
      "role": "user",
      "content": "Classify this ticket as billing, login or bug. Give one reason: I was charged twice for the same invoice."
    }
  ],
  "max_tokens": 4096
}

request = urllib.request.Request(
    "https://api.y-api.bestvirtualgoods.com/v1/chat/completions",
    data=json.dumps(payload).encode("utf-8"),
    headers={
        "Authorization": "Bearer " + os.environ["TOKEN"],
        "Content-Type": "application/json",
    },
    method="POST",
)
try:
    with urllib.request.urlopen(request, timeout=120) as response:
        result = json.load(response)
    print(json.dumps(result, ensure_ascii=False, indent=2))
except urllib.error.HTTPError as error:
    print(error.read().decode("utf-8"), file=sys.stderr)
    raise SystemExit(1)
```

### How to evaluate the result

Check that the category is billing and the reason uses only the ticket. Add ambiguous and multi-issue tickets; measure wrong routing, not just fluent wording.

## Before you choose

### Is this the same model as V4 Flash 0731?

No. They have separate catalog IDs. The publisher describes 0731 as the official release superseding the preview. Keep the exact ID in saved evaluations and re-test before changing it.

## Sources & scope

Technical facts come from the cited model page and, where available, its linked publisher card. A card describes that checkpoint; it is not proof of the weights a gateway serves. Prices come only from the Y-API catalog. We do not claim measured latency, uptime or benchmark scores for this endpoint.

- [OpenRouter model page & specifications](https://openrouter.ai/deepseek/deepseek-v4-flash)
- [Publisher model card linked by OpenRouter](https://huggingface.co/deepseek-ai/DeepSeek-V4-Flash)
- [Y-API catalog & prices (JSON)](https://y-api.bestvirtualgoods.com/models.json)

## Models to compare

Compare these alternatives on the same inputs. Their descriptions explain different roles; a lower price does not establish equivalent quality.

### [DeepSeek V4 Flash 0731](https://y-api.bestvirtualgoods.com/models/deepseek/deepseek-v4-flash-0731)

DeepSeek V4 Flash 0731 is the publisher’s official V4 Flash release, following the earlier preview. It remains a text-only model; its post-training revision focuses on coding, reasoning and agent tasks.

### [DeepSeek V4.1 Flash](https://y-api.bestvirtualgoods.com/models/deepseek/deepseek-v4.1-flash)

DeepSeek V4.1 Flash adds native image understanding to the Flash line. Its Causal Encoder-Decoder architecture separates input processing from output generation, with a design aimed at input-heavy coding and computer-use workflows.

## Links

- HTML version of this page: https://y-api.bestvirtualgoods.com/models/deepseek/deepseek-v4-flash
- Site index for agents: https://y-api.bestvirtualgoods.com/llms.txt
- Full reference (single file): https://y-api.bestvirtualgoods.com/llms-full.txt
- OpenAPI 3.1 spec: https://y-api.bestvirtualgoods.com/openapi.json
- Model catalog (JSON, no key needed): https://y-api.bestvirtualgoods.com/models.json
- API base URL: `https://api.y-api.bestvirtualgoods.com/v1`
- Contact: support@bestvirtualgoods.com
- Model catalog: https://y-api.bestvirtualgoods.com/models
- Integration guide: https://y-api.bestvirtualgoods.com/docs