Development

GPT-6 Luna reportedly beats GPT-5.6 Sol on a health evaluation

development2026-09-27benchmarks

Claim

The newsletter reports GPT-6 Luna outperforming GPT-5.6 Sol on HealthBench Professional for a third of a cent.

Reported metric: a third of a cent

Reporting date: 2026-09-27 (not necessarily the event date)

Sources

Attribution and reporting linked by this record; links do not imply independent verification.

Welcome to September 27, 2026 (theinnermostloop.substack.com)
Source linked by the September 27 issue (x.com)

Indexed from the September 27 newsletter. Linked-source claims have not been independently verified.

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Related to

OpenAI introduces GPT-6 Sol and Luna

Reported in

Welcome to September 27, 2026

Actor

OpenAI

Referenced by

Welcome to September 27, 2026

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Citation formatCitation text

GPT-6 Luna reportedly beats GPT-5.6 Sol on a health evaluation
Innermost Loop KB — secondary record
Reporting date: 2026-09-27
KB permalink: https://nicholsn.github.io/innermost-loop-kb/developments/2026-09-27-luna-health
Claim: The newsletter reports GPT-6 Luna outperforming GPT-5.6 Sol on HealthBench Professional for a third of a cent.
Attributed sources:
- Welcome to September 27, 2026 — https://theinnermostloop.substack.com/p/welcome-to-september-27-2026
- Source linked by the September 27 issue — https://x.com/thekaransinghal/status/2102829748846260434
This citation does not imply independent verification of linked-source claims.

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