Effect AI SDK

npm install effect @effect/ai @effect/ai-openai

import { OpenAiClient, OpenAiCompletions } from "@effect/ai-openai";
import { FetchHttpClient } from "@effect/platform";
import { Layer, Config } from "effect";

const OpenDunesClient = OpenAiClient.layerConfig({
  apiKey: Config.redacted("OPENDUNES_API_KEY"),
  baseUrl: Config.succeed("https://opendunes.com/api/v1"),
}).pipe(Layer.provide(FetchHttpClient.layer));

export const OpenDunesCompletions = OpenAiCompletions.layer(
  "anthropic/claude-sonnet-5"
).pipe(Layer.provide(OpenDunesClient));

import { AiLanguageModel, AiResponse } from "@effect/ai";
import { Effect, Layer } from "effect";
import { OpenDunesCompletions } from "./providers";

const program = Effect.gen(function* () {
  const model = yield* AiLanguageModel.AiLanguageModel;

  const response = yield* model.generateText({
    prompt: "What is the Casbah of Algiers known for?",
  });

  return response.text;
});

const result = await Effect.runPromise(
  program.pipe(Effect.provide(OpenDunesCompletions))
);
console.log(result);

import { AiLanguageModel } from "@effect/ai";
import { Schema } from "@effect/schema";
import { Effect } from "effect";
import { OpenDunesCompletions } from "./providers";

const CitySchema = Schema.Struct({
  name: Schema.String,
  country: Schema.String,
  population: Schema.Number,
});

const program = Effect.gen(function* () {
  const model = yield* AiLanguageModel.AiLanguageModel;

  const city = yield* model.generateObject({
    prompt: "Return information about Oran, Algeria.",
    schema: CitySchema,
  });

  return city;
});

const city = await Effect.runPromise(
  program.pipe(Effect.provide(OpenDunesCompletions))
);
console.log(city.name, city.population);

import { AiLanguageModel } from "@effect/ai";
import { Effect, Stream } from "effect";
import { OpenDunesCompletions } from "./providers";

const program = Effect.gen(function* () {
  const model = yield* AiLanguageModel.AiLanguageModel;

  const stream = yield* model.streamText({
    prompt: "Count to five in Tamazight.",
  });

  yield* stream.pipe(
    Stream.tap((chunk) => Effect.sync(() => process.stdout.write(chunk.text))),
    Stream.runDrain
  );
});

await Effect.runPromise(program.pipe(Effect.provide(OpenDunesCompletions)));

const FastLayer = OpenAiCompletions.layer("meta-llama/llama-4-maverick").pipe(
  Layer.provide(OpenDunesClient)
);

const HighQualityLayer = OpenAiCompletions.layer("anthropic/claude-opus-4.8").pipe(
  Layer.provide(OpenDunesClient)
);

const layer = userTier === "pro" ? HighQualityLayer : FastLayer;
await Effect.runPromise(program.pipe(Effect.provide(layer)));