Research retrieval or analysis?
Search appears as an explicit task for only one model on this shortlist. For every other model, retrieval tooling and citation behavior require separate verification.
Purpose guide · Reasoning and research
Catalog current through July 21, 2026
Five source-backed models whose Epoch records explicitly name reasoning, proof, or search work. This is a shortlist, not a performance ranking.
Selection rule
Included when the Epoch record explicitly lists mathematical reasoning, quantitative reasoning, theorem proving, proof generation, proof verification, or search. A matching label establishes task relevance only, not quality.
Task-fit shortlist
Ordered by release date for readability, newest first. The order is not a score or recommendation.
Released November 6, 2025
Released October 28, 2025
Released October 27, 2025
Released September 16, 2025
Released September 5, 2025
Released July 25, 2025
Released July 25, 2025
Released July 11, 2025
Released April 29, 2025
Released March 16, 2025
Released March 11, 2025
Released March 6, 2025
Released January 22, 2025
Released November 16, 2024
Released October 22, 2024
Released October 22, 2024
Released October 22, 2024
Released September 19, 2024
Released September 19, 2024
Released September 17, 2024
Released May 20, 2024
Released February 4, 2024
Released September 4, 2021
Released August 7, 2005
Decision criteria
These checks narrow an evaluation plan. They do not replace hands-on testing.
Search appears as an explicit task for only one model on this shortlist. For every other model, retrieval tooling and citation behavior require separate verification.
Use the task labels to distinguish quantitative reasoning from theorem and proof work. Do not assume one label covers the other.
Evaluate factual accuracy, source fidelity, calibration, tool use, latency, context handling, and cost on your own workload. This catalog does not measure them.
Evidence boundary
No task-level quality, price, context window, latency, or reliability measurement is present in the Epoch catalog. We therefore publish no ranking or “best” label.
Catalog source: Epoch AI Data on AI Models, retrieved 2026-07-21, CC-BY. Artifact sha256:80ad08198183693101ceb246a5ea272d64c06c147fc41f72cca8526b32483424.
Each listed model links to its model-level source above. See the publication source ledger and methodology for the wider evidence policy.