/**
 * OpenAI (GPT) LLM Provider
 *
 * Uses GPT-4 for structured data extraction from research sources.
 * Default model: gpt-4o-mini (fast and cost-effective)
 */
import type { LLMProvider, LLMProviderConfig, SynthesisRequest, SynthesisResult, SynthesizeCallback } from '../llm-provider.js';
export declare class OpenAIProvider implements LLMProvider {
    readonly name = "openai";
    readonly model: string;
    private readonly apiKey;
    private readonly maxTokens;
    private readonly temperature;
    private readonly timeoutMs;
    private readonly baseUrl;
    constructor(config?: LLMProviderConfig);
    isAvailable(): boolean;
    synthesize(request: SynthesisRequest): Promise<SynthesisResult>;
    /**
     * Callback-based synthesize - bypasses Promise limitations after browse timeouts.
     * The callback is invoked directly when synthesis completes, avoiding Promise.then().
     */
    synthesizeWithCallback(request: SynthesisRequest, callback: SynthesizeCallback): void;
    /**
     * Callback-based API call that doesn't rely on Promise resolution.
     */
    private callAPIWithCallback;
    private callAPI;
}
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