Comparison
pythia vs hallucination-index
Verdict
Pick pythia if pythia is a hub maintained by EleutherAI focused on research notebooks addressing interpretability and learning dynamics; pick hallucination-index if hallucination-Index helps users identify LLMs with the lowest propensity for factual errors across varying context lengths and source types.
Markdown twin · pythia alternatives · hallucination-index alternatives
GraphCanon updated 2w
vs
Trust & integrity
| Signal | pythia | hallucination-index |
|---|---|---|
| Maintenance | Slowing (264d since push) As of 2w · github_public_v1 | Dormant (365d since push) As of 3w · github_public_v1 |
| Provenance | Not a fork · Organization account As of 2w · github_public_v1 | Not a fork · Organization account As of 3w · github_public_v1 |
| OSV dependency advisories | Published findings As of 1mo · osv@v1 | No lockfile (source not queried) As of 1mo · osv@v1 |
| deps.dev advisories | Not queried deps.dev@v1 | Not queried deps.dev@v1 |
| OpenSSF Scorecard | Not queried openssf-scorecard@v1 | Not queried openssf-scorecard@v1 |
Tagline
- pythia
- Hub for EleutherAI's work on interpretability and learning dynamics
- hallucination-index
- Initiative to evaluate and rank popular LLMs based on hallucination propensity
Stars
- pythia
- 2.9k
- hallucination-index
- 116
Forks
- pythia
- 222
- hallucination-index
- 8
Open issues
- pythia
- 26
- hallucination-index
- 1
Language
- pythia
- Jupyter Notebook
- hallucination-index
- -
Adopt for
- pythia
- Pythia is a hub maintained by EleutherAI focused on research notebooks addressing interpretability and learning dynamics.
- hallucination-index
- Hallucination-Index helps users identify LLMs with the lowest propensity for factual errors across varying context lengths and source types.
Persona
- pythia
- -
- hallucination-index
- -
Runtime
- pythia
- -
- hallucination-index
- -
License
- pythia
- The repository's content is licensed under Apache-2.0, which allows for a broad range of uses including both commercial and non-commercial purposes while requiring preservation of copyright notices.
- hallucination-index
- -
Last pushed
- pythia
- Nov 15, 2025
- hallucination-index
- Jul 28, 2025
Categories
- pythia
- Evaluation & Observability
- hallucination-index
- Evaluation & Observability
Trust and health
Maintenance
- pythia
- Slowing (36%)
- hallucination-index
- Dormant (18%)
Days since push
- pythia
- 264d
- hallucination-index
- 365d
Open issues (now)
- pythia
- 26
- hallucination-index
- 1
OSV dependency advisories
- pythia
- Published findings
- hallucination-index
- No lockfile (source not queried)
Full report
- pythia
- Trust report
- hallucination-index
- Trust report
Choose pythia if…
- Pricing: All code in the GitHub repo, Pythia models, and other artifacts are available under an open-source Apache-2.0 license, making it free to use with attribution..
- Tags unique to pythia: interpretability, learning dynamics, research.
- When you are specifically interested in understanding the internal workings and behavior of AI models, as Pythia is centered around interpretability and learning dynamics.
When NOT to use pythia
- Avoid using Pythia if you need specific applications or tools for immediate practical AI model deployment, as it primarily focuses on research and not direct application.
- If interpretability is not a prime focus of your project and the primary goal is building functional machine learning models without delving into theoretical aspects.
Choose hallucination-index if…
- Tags unique to hallucination-index: hallucinations, large language models, llm-evaluation, openai.
- 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.
- Leaner open-issue backlog (1).
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.
Explore
Sources
Every stat on this page traces to a dated GitHub sync, license file, enrichment field, or trust scan.
- GitHub stars (EleutherAI/pythia) · observed Aug 7, 2026
- GitHub forks (EleutherAI/pythia) · observed Aug 7, 2026
- Last push (EleutherAI/pythia) · observed Nov 15, 2025
- License file (Apache-2.0) · observed Aug 7, 2026
- Decision facts (enrichment) · observed Jul 12, 2026
- Trust scan (lockfile / OSV) · observed Jul 11, 2026
- GitHub stars (rungalileo/hallucination-index) · observed Jul 29, 2026
- GitHub forks (rungalileo/hallucination-index) · observed Jul 29, 2026
- Last push (rungalileo/hallucination-index) · observed Jul 28, 2025
- License file (unknown) · observed Jul 29, 2026
- Decision facts (enrichment) · observed Jul 17, 2026
- Trust scan (lockfile / OSV) · observed Jul 11, 2026
GitHub stars on cards: pythia 2.9k · hallucination-index 116 (synced Aug 7, 2026).
Common questions
- What is the difference between pythia and hallucination-index?
- pythia: Hub for EleutherAI's work on interpretability and learning dynamics. hallucination-index: Initiative to evaluate and rank popular LLMs based on hallucination propensity. See the comparison table for live GitHub stats and shared categories.
- When should I choose pythia over hallucination-index?
- Choose pythia over hallucination-index when Pricing: All code in the GitHub repo, Pythia models, and other artifacts are available under an open-source Apache-2.0 license, making it free to use with attribution.; Tags unique to pythia: interpretability, learning dynamics, research; When you are specifically interested in understanding the internal workings and behavior of AI models, as Pythia is centered around interpretability and learning dynamics.
- When should I choose hallucination-index over pythia?
- Choose hallucination-index over pythia when Tags unique to hallucination-index: hallucinations, large language models, llm-evaluation, openai; 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; Leaner open-issue backlog (1).
- When should I avoid pythia?
- Avoid using Pythia if you need specific applications or tools for immediate practical AI model deployment, as it primarily focuses on research and not direct application. If interpretability is not a prime focus of your project and the primary goal is building functional machine learning models without delving into theoretical aspects.
- 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.
- Is pythia or hallucination-index more popular on GitHub?
- pythia has more GitHub stars (2,872 vs 116). Stars measure visibility, not whether either tool fits your constraints.
- Are pythia and hallucination-index open source?
- Yes - both are open-source projects on GitHub.
- Where can I find alternatives to pythia or hallucination-index?
- GraphCanon lists graph-backed alternatives at pythia alternatives and hallucination-index alternatives (pythia markdown twin, hallucination-index markdown twin), 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 mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers.
- Which is better maintained, pythia or hallucination-index?
- pythia: Slowing. hallucination-index: Dormant. 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 pythia and hallucination-index?
- GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: pythia trust report; hallucination-index trust report.