Doubleword

Add the credential

Open Settings > Model Providers, click Add Model Provider and select Doubleword. Give the row a name, pick the organization, team or project it belongs to, and fill in:

Field	Value
`DOUBLEWORD_API_KEY`	A Doubleword API key from app.doubleword.ai/api-keys.

Create the key for inference (the “realtime” purpose). Doubleword refuses model calls made with a key whose purpose is “platform”, with HTTP 403. Save the row. Every virtual key whose scope can see the row can now dispatch to it, unless the key restricts its providers. See Virtual keys. The gateway calls https://api.doubleword.ai as an OpenAI-compatible endpoint.

Model names

Write doubleword/<model>. Doubleword model ids keep the vendor slash and casing Doubleword uses, for example doubleword/deepseek-ai/DeepSeek-V4.1-Flash, doubleword/Qwen/Qwen3-Embedding-8B or doubleword/openai/gpt-oss-120b. Only the first segment names the provider, and the rest is sent to Doubleword as is. Always keep the doubleword/ prefix. A bare openai/gpt-oss-120b names the OpenAI provider, not Doubleword.

Send a request

curl https://gateway.langwatch.ai/v1/chat/completions \
  -H "Authorization: Bearer $LANGWATCH_VIRTUAL_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "doubleword/deepseek-ai/DeepSeek-V4.1-Flash",
    "messages": [{"role": "user", "content": "Say hi in one word"}]
  }'

Endpoints

Endpoint	Served
`POST /v1/chat/completions`	Yes
`POST /v1/messages`	Yes, translated
`POST /v1/embeddings`	Yes, with a Doubleword embeddings model such as `doubleword/Qwen/Qwen3-Embedding-8B`
`POST /v1/images/generations`, `POST /v1/images/edits`	No, rejected with HTTP 400. Image traffic needs a direct OpenAI, Azure OpenAI, Gemini, Vertex AI or Bedrock credential. See Images
`GET /v1/models`	Yes, from the Doubleword catalog

Cost

LangWatch prices Doubleword calls at Doubleword’s realtime rates. Batch and async rates are not used, because the gateway sends realtime requests.

Last modified on October 24, 2026

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Add the credential

Model names

Send a request

Endpoints

Cost

​Add the credential

​Model names

​Send a request

​Endpoints

​Cost

Add the credential

Model names

Send a request

Endpoints

Cost