TypeSafe Launches Decision Model Jev with New RLCD Training Method

On September 16, TypeSafe, a new lab co-founded by Diogo — one of the InstructGPT paper authors and a self-described co-inventor of ChatGPT — released a frontier model called Jev along with a new training method, RLCD. Multiple bloggers reshared the news with consistent core details.

Confirmed

• TypeSafe released the new model Jev and the new training method RLCD (named in contrast to RLHF); the team had been in stealth for about two years before the launch.
• Jev is positioned not as a chat model but as "decision intelligence": it takes natural-language questions (including ambiguous or subjective ones) and returns yes/no probabilities or custom categories, serving as a structured judgment component in automated workflows.
• Claimed performance from the publisher: 20-200x faster and 40-400x cheaper than existing models (per @soumitrashukla9's recap, judgments at the level of Fable), free output tokens, sub-500ms responses, and no hallucinations.

Unconfirmed

• The speed, cost, and "zero hallucination" claims all come from the publisher alone; most posts are reposts, with no independent evaluation or benchmark verification yet.
• "ChatGPT co-inventor" is the founder's self-description — several reposts used the phrase "self-described" — and the identification (Diogo) comes via @danshipper's account.

Why it matters

• If the claimed latency and cost hold up, Jev could dramatically lower the barrier to embedding large numbers of judgment calls in automated pipelines — a real cost pain point in today's agent workflows.
• Its approach of "structured probabilistic outputs instead of generated text" represents a product path distinct from mainstream chat models, making third-party evaluations worth watching.

2026-09-16 ~ 2026-09-16 · 7 related posts

• ChatGPT Co-inventor Unveils Jev, Claims 20x Faster and 40x Cheaper via New RLCD Method — damianplayer · 2026-09-16
• TypeSafe launches Jev: a 20-200x faster, 40-400x cheaper model that turns fuzzy questions into probabilities — danshipper · 2026-09-16
• Self-Styled ChatGPT Co-Inventor Launches 'Jev' Model Claiming No Hallucinations, Free Output Tokens — damianplayer · 2026-09-16
• TypeSafe Launches Jev: A Probability-Judging Model 25x Faster, 600x Cheaper Than Fable-Class Judges — soumitrashukla9 · 2026-09-16
• Ex-OpenAI RLHF builder launches Jev: a chatless decision model with 150ms responses and $42/B input tokens — SucceededMind · 2026-09-16

2 near-duplicate retellings: lateinteraction · hackgoofer