import type { LLMClient, Message, CompletionOptions, ProviderInfo, StreamingOptions, StreamingResult } from './client.js';
export interface OpenAIClientOptions {
    /** API key (defaults to OPENAI_API_KEY env var) */
    apiKey?: string;
    /** Default model to use */
    model?: string;
    /** Base URL for API (for proxies/alternatives) */
    baseURL?: string;
    /** Callback to receive token usage from each API call */
    onUsage?: (inputTokens: number, outputTokens: number) => void;
}
export declare class OpenAIClient implements LLMClient {
    private client;
    private defaultModel;
    private logger;
    private onUsage?;
    constructor(options?: OpenAIClientOptions);
    getProviderInfo(): ProviderInfo;
    chat(messages: Message[], options?: CompletionOptions): Promise<string>;
    complete(prompt: string, options?: CompletionOptions): Promise<string>;
    parseJSON<T>(response: string): T;
    stream(prompt: string, options?: StreamingOptions): Promise<StreamingResult>;
    streamChat(messages: Message[], options?: StreamingOptions): Promise<StreamingResult>;
}
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