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Trustworthiness is frequently treated as a label attached to an intelligent system once selected technical, ethical, or governance requirements have been addressed. Such a binary interpretation is inadequate because system properties, operating conditions, organizational responsibilities, stakeholder expectations, and available assurance evidence change throughout the lifecycle. This article proposes a conceptual trustworthiness maturity model that interprets trustworthiness as an evolutionary system capability rather than a fixed attribute, certification outcome, or deployment decision. The model organizes progression across six levels: unstructured or ad hoc practices; foundational transparency and documentation; managed reliability, explainability, and human oversight; defined governance integration and accountability; continuous assurance and lifecycle monitoring; and adaptive trustworthiness learning and system updating. Foundational maturity requires accessible system, model, data, dataset, and decision documentation together with provenance, traceability, auditability, and maintained evidence trails. Higher capability requires context-sensitive evidence of reliability, validity, robustness, uncertainty, calibration, explanation quality, and meaningful human intervention. Advanced maturity additionally depends on responsibility mapping, organizational and institutional accountability, lifecycle governance, continuous monitoring, drift review, incident learning, assurance review, and controlled feedback updating. The principal contribution is an integrated maturity structure that connects technical, human, organizational, and lifecycle capabilities while retaining explicit boundaries against overclaiming. Maturity levels may help structure assessment planning, identify capability gaps, and clarify development priorities, but they do not independently prove trustworthiness, safety, ethical sufficiency, legal compliance, certification eligibility, or deployment readiness. The proposed model therefore supports conceptual maturity assessment and future empirical validation rather than operational prescription.

Foundation models have expanded the scope of artificial intelligence by supporting language generation, multimodal reasoning, knowledge-intensive assistance, decision support, and adaptable downstream applications. Their broad capabilities, however, do not establish that their outputs, explanations, internal processes, or deployment arrangements are trustworthy. This scoping review maps the research landscape concerning foundation-model trustworthiness across interpretability, explanation capabilities, hallucination, uncertainty, reliability, alignment, evaluation, and human oversight. The review uses structured search concepts, eligibility principles, evidence extraction, and dimension-based mapping to examine how peer-reviewed scholarship characterizes foundation models as general-purpose intelligent systems and how trustworthiness evidence is distributed across technical, human-centered, organizational, and governance domains. The synthesis indicates that interpretability methods can expose selected behavioral or representational features but do not independently demonstrate explanation fidelity, usefulness, or safety. Hallucination and factuality research identifies persistent risks involving fabrication, unsupported claims, weak grounding, and persuasive misinformation, while uncertainty methods remain constrained by calibration, context shift, and user-communication challenges. Alignment and post-training techniques may shape preferred behaviors but retain risks associated with proxy objectives, preference representation, and residual failure. Benchmarking, human evaluation, stress testing, and oversight provide partial evidence, yet their value depends on construct validity, domain relevance, intervention capacity, accountability, and lifecycle monitoring. The research landscape is therefore fragmented across disciplines and frequently model-centred rather than socio-technical. Key priorities include stronger foundation-model interpretability validation, consistent hallucination measurement, usable uncertainty communication, externally valid evaluation, meaningful oversight testing, multimodal analysis, and lifecycle governance. The review contributes an integrated evidence map while emphasizing that no single trustworthiness dimension certifies safety, reliability, accountability, or deployment readiness.