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Lambda

Lambda Inference API

Lambda Inference API is an OpenAI-compatible REST gateway at https://api.lambda.ai/v1 that serves hosted open-source language models (Llama, DeepSeek, Hermes, Qwen, and others) behind the standard OpenAI Chat Completions surface. Chat completion responses can be streamed as HTTP Server-Sent Events by setting "stream":true on the POST /chat/completions request body; the SSE stream emits chat.completion.chunk events terminated by a data [DONE] sentinel. As of 2026-05-29 Lambda has announced the Inference API is winding down in favor of customer self-hosted deployments on Lambda GPU instances.

Documentation Provider Profile APIs.io AsyncAPI GitHub

Lambda Inference API is one of 13 APIs that Lambda publishes on the APIs.io network, described by an AsyncAPI event-driven specification.

Tagged areas include Artificial Intelligence, Chat, Completions, Inference, and LLM. The published artifact set on APIs.io includes API documentation and an AsyncAPI specification.

This event API exposes 1 operation across 1 channel, and defines 7 schemas. It is described by AsyncAPI 2.6.0, at version 1.0.0.

The API connects through a single server, api.lambda.ai/v1 (https).

1 operations 1 channels 7 schemas

Metadata

The identity and technical contract details declared by the specification.

Specification
AsyncAPI 2.6.0
API Version
1.0.0
Base URL
https://api.lambda.ai/v1
Contact
API Evangelist
License
API documentation - Lambda Terms of Service
Resource Areas
1

Channels & Operations 1

Across 1 channel, the API surfaces 1 operation. Each is listed below with its action, channel, parameters, and response codes.

Channels 1
SUB
/chat/completions
Subscribe to streamed chat completion chunks (SSE).
streamChatCompletionChunks body

Messages & Schemas 7

The contract defines 7 schemas that model the data carried by its messages. The most detailed are ChatCompletionChunk (6 properties), ChatCompletionMessageToolCallChunk (4 properties), ChatCompletionChunkChoice (4 properties), ChatCompletionStreamResponseDelta (3 properties). Each schema is shown below with its type and property counts.

ChatCompletionChunk
message
A single SSE data: event carrying one JSON chat.completion.chunk object. Many of these are emitted per request, in order.
StreamDone
message
The literal SSE event data: [DONE] that marks end of stream. Not JSON; the payload is the string [DONE].
StreamDoneSentinel
string
End-of-stream sentinel. The full SSE line is data: [DONE]. The payload value modeled here is the string literal [DONE].
ChatCompletionChunk
object
Represents a streamed chunk of a chat completion response. Shape follows the OpenAI chat.completion.chunk schema that Lambda advertises compatibility with.
6 properties 5 required
ChatCompletionChunkChoice
object
4 properties 2 required
ChatCompletionStreamResponseDelta
object
A chat completion delta generated by a streamed model response. Fields are the OpenAI-compatible subset Lambda advertises.
3 properties
ChatCompletionMessageToolCallChunk
object
4 properties 1 required

Specification

The full machine-readable AsyncAPI contract behind this narrative.

Source

lambda-labs-asyncapi.yml Raw ↑

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#Artificial Intelligence#Chat#Completions#Inference#LLM#OpenAI-Compatible#SSE#Streaming
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API Details
ID
lambda-labs:inference-api
Base URL
https://api.lambda.ai/v1
Docs
https://docs.lambda.ai/public-cloud/lambda-inference-api/
Provider
Lambda
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