--- title: "hallucination-index vs cupel" type: "comparison" canonical_url: "https://www.graphcanon.com/compare/rungalileo-hallucination-index-vs-tolitius-cupel" tools: ["rungalileo-hallucination-index", "tolitius-cupel"] --- # hallucination-index vs cupel *GraphCanon updated Sep 20, 2026* ## Verdict Pick hallucination-index if hallucination-Index helps users identify LLMs with the lowest propensity for factual errors across varying context lengths and source types; pick cupel if cupel is a JavaScript-based toolkit for discovering and evaluating the performance of large language models using configurable prompts, scoring mechanisms, multi-turn dialogues, and local inference server discovery. [hallucination-index](https://www.rungalileo.io/hallucinationindex) reports 115 GitHub stars, 8 forks, and 1 open issues, last pushed Jul 28, 2025. [cupel](https://cupel.run) has 64 stars, 0 forks, and 2 open issues, last pushed Aug 31, 2026. Figures are from public GitHub metadata via [hallucination-index's repository](https://github.com/rungalileo/hallucination-index) and [cupel's repository](https://github.com/tolitius/cupel). | | [hallucination-index](/tools/rungalileo-hallucination-index.md) | [cupel](/tools/tolitius-cupel.md) | | --- | --- | --- | | Tagline | Initiative to evaluate and rank popular LLMs based on hallucination propensity | discovery tool for evaluating LLM performance | | Stars | 115 | 64 | | Forks | 8 | 0 | | Open issues | 1 | 2 | | Language | - | Python | | Adopt for | Hallucination-Index helps users identify LLMs with the lowest propensity for factual errors across varying context lengths and source types. | Cupel is a JavaScript-based toolkit for discovering and evaluating the performance of large language models using configurable prompts, scoring mechanisms, multi-turn dialogues, and local inference server discovery. | | Persona | - | - | | Runtime | - | - | | License | - | Apache-2.0 | | Categories | Evaluation & Observability | Evaluation & Observability | ## Trust and health _Sourced signals - not a safety guarantee. No winner column._ | | [hallucination-index](/tools/rungalileo-hallucination-index.md) | [cupel](/tools/tolitius-cupel.md) | | --- | --- | --- | | Maintenance | Dormant (18%) | Active (82%) | | Days since push | 418d | 10d | | Open issues (now) | 1 | 2 | | Stars delta | -1 (30d) | +13 (30d) | | Owner type | Organization | User | | Full report | [trust report](/tools/rungalileo-hallucination-index/trust.md) | [trust report](/tools/tolitius-cupel/trust.md) | ## Decision facts: hallucination-index - **Adopt for:** Hallucination-Index helps users identify LLMs with the lowest propensity for factual errors across varying context lengths and source types. ## Decision facts: cupel - **Adopt for:** Cupel is a JavaScript-based toolkit for discovering and evaluating the performance of large language models using configurable prompts, scoring mechanisms, multi-turn dialogues, and local inference server discovery. ## Choose when ### Choose hallucination-index if… - Tags unique to hallucination-index: hallucinations, large-language-models, openai, rag. - Use when you need to ensure accuracy in short-context tasks, as it tests models like Chain-of-Note prompting techniques specifically for such scenarios. - More GitHub stars (115 vs 64) - visibility, not fit. ### Choose cupel if… - Tags unique to cupel: inference-servers-discovery, local-llm, multi-turn-dialogue, prompt-generation. - When aiming to evaluate LLMs on local servers due to its auto-discovery feature for known ports of inference servers - More recently updated (last pushed Aug 31, 2026). ## When NOT to use hallucination-index - Avoid using Hallucination-Index when your application requires real-time evaluation of hallucinations, as it focuses on predefined tests rather than live model performance. - Do not rely solely on this index if your primary concern is the latest updates to LLM models; its data might not reflect recent improvements in models or the introduction of new ones. ## When NOT to use cupel - If you require a solution that supports a non-JavaScript runtime environment, as Cupel is JavaScript-exclusive - When you need a tool without UI capabilities since Cupel's UI is bundled in the package and may not suit headless operations ## Common questions ### What is the difference between hallucination-index and cupel? hallucination-index: Initiative to evaluate and rank popular LLMs based on hallucination propensity. cupel: discovery tool for evaluating LLM performance. See the comparison table for live GitHub stats and shared categories. ### When should I choose hallucination-index over cupel? Choose hallucination-index over cupel when Tags unique to hallucination-index: hallucinations, large-language-models, openai, rag; Use when you need to ensure accuracy in short-context tasks, as it tests models like Chain-of-Note prompting techniques specifically for such scenarios; More GitHub stars (115 vs 64) - visibility, not fit. ### When should I choose cupel over hallucination-index? Choose cupel over hallucination-index when Tags unique to cupel: inference-servers-discovery, local-llm, multi-turn-dialogue, prompt-generation; When aiming to evaluate LLMs on local servers due to its auto-discovery feature for known ports of inference servers; More recently updated (last pushed Aug 31, 2026). ### When should I avoid hallucination-index? Avoid using Hallucination-Index when your application requires real-time evaluation of hallucinations, as it focuses on predefined tests rather than live model performance. Do not rely solely on this index if your primary concern is the latest updates to LLM models; its data might not reflect recent improvements in models or the introduction of new ones. ### When should I avoid cupel? If you require a solution that supports a non-JavaScript runtime environment, as Cupel is JavaScript-exclusive When you need a tool without UI capabilities since Cupel's UI is bundled in the package and may not suit headless operations ### Is hallucination-index or cupel more popular on GitHub? hallucination-index has more GitHub stars (115 vs 64). Stars measure visibility, not whether either tool fits your constraints. ### Are hallucination-index and cupel open source? Yes - both are open-source projects on GitHub. ### Where can I find alternatives to hallucination-index or cupel? GraphCanon lists graph-backed alternatives at [hallucination-index alternatives](/tools/rungalileo-hallucination-index/alternatives) and [cupel alternatives](/tools/tolitius-cupel/alternatives) ([hallucination-index markdown twin](/tools/rungalileo-hallucination-index/alternatives.md), [cupel markdown twin](/tools/tolitius-cupel/alternatives.md)), ranked by typed relationship edges rather than popularity votes. ### Is there a machine-readable version of this comparison? Yes. The markdown twin at [this comparison](/compare/rungalileo-hallucination-index-vs-tolitius-cupel.md) mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers. ### Which is better maintained, hallucination-index or cupel? hallucination-index: Dormant. cupel: Active. Compare maintenance labels, days since push, and release cadence in the trust section below - stars alone do not measure maintenance. ### Where are the full trust reports for hallucination-index and cupel? GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: [hallucination-index trust report](/tools/rungalileo-hallucination-index/trust); [cupel trust report](/tools/tolitius-cupel/trust). --- **Machine-readable endpoints** - JSON: [`/api/graphcanon/graph?tool=rungalileo-hallucination-index`](/api/graphcanon/graph?tool=rungalileo-hallucination-index) - LLM index: [/llms.txt](/llms.txt) - Full corpus: [/llms-full.txt](/llms-full.txt) _GraphCanon - The knowledge graph for AI development. https://www.graphcanon.com/_