DeepSeek V4.1 Flash is now available

Updated: September 11, 2026

DeepSeek V4.1 Flash is now officially available on BetterToken. Use the exact Model ID deepseek-flash. Check current access and pricing in the model plaza before sending a request.

Set model to deepseek-flash. The previous limited-test Model ID is no longer the current entry.

What is available now

Setting	Value

| Model ID | deepseek-flash | | OpenAI Base URL | https://bettertoken.ai/v1 | | OpenAI Chat Completions | POST /v1/chat/completions | | Anthropic Base URL | https://bettertoken.ai | | Anthropic Messages | POST /v1/messages | | BetterToken status | Available |

Choose OpenAI Chat Completions or Anthropic Messages to match your client. Both protocols use the same BetterToken API Key and Model ID.

Usage suggestions

Compare DeepSeek V4.1 Flash with another available model on tasks that matter to your workflow:

• Coding changes: give both models the same repository task and compare correctness, edit quality, and the amount of follow-up required
• Agent workflows: measure how reliably each model follows multistep instructions and uses the tools your client provides
• Reasoning quality: compare difficult debugging, planning, and analysis tasks with the same prompt and evaluation criteria
• Latency and cost: record time to first token, total completion time, token usage, and the live BetterToken price

Run several representative prompts instead of relying on one result. Keep the client, system prompt, tool definitions, and sampling settings the same for a fair comparison.

Quick start

1. Create a BetterToken API Key or open Setup for an existing key.

2. Confirm that deepseek-flash is available in the model plaza.

3. Set the Base URL for your protocol using the table above, and enter the complete Model ID.

4. Send a small request before running a longer evaluation.

curl "https://bettertoken.ai/v1/chat/completions" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  --data '{
    "model": "deepseek-flash",
    "messages": [
      {
        "role": "user",
        "content": "Explain the likely cause of this failing test and propose the smallest fix."
      }
    ]
  }'

A successful response returns model output under choices[0].message.content. For SDK examples and the complete request format, see the Chat Completions API reference.

Migrate from the limited-test Model ID

If a configuration still uses the previous limited-test Model ID:

1. Find every configuration that contains deepseek-v4.1-flash-expires-on-0910.
2. Replace it with deepseek-flash.
3. Run a smoke test after the change.
4. Confirm the current model entry and price in the model plaza.

Frequently asked questions

Can I use this Model ID in production?

Yes. Use deepseek-flash and verify that the model remains available for your BetterToken API Key in the model plaza.

Can I use it with Claude Code or the Anthropic Messages API?

Yes. For Claude Code or Anthropic Messages, use Base URL https://bettertoken.ai and Model ID deepseek-flash. Direct Messages requests use POST /v1/messages with your BetterToken API Key in x-api-key.

Where can I find the current price?

Check the live model plaza. Availability and pricing can change.

Related documentation

• BetterToken Chat Completions API reference
• Anthropic Messages API reference