TypeSafe
An AI infrastructure company specializing in the development of AI models purpose-built for decision-making, focused on providing low-latency, low-cost structured reasoning services for high-frequency, real-time decision scenarios.
Core Facts
Jev is a type of front-end model called a 'System 1 model' — fast, cheap, and structured, designed specifically for decision-making; it does not generate text but instead returns probability scores within a predefined set of options.
JEV is a decision model launched by TypeSafe
TypeSafe positions Jev as a 'System 1 model,' a concept inspired by the dual-system cognitive theory in Daniel Kahneman's Thinking, Fast and Slow.
Timeline (last 90 days)
TypeSafe's Jev product lists the same price of $0.042 per million input tokens as Microsoft Decision-1.
A decision model is a category of model that takes state (text, JSON, images) and a typed question and returns structured answers (probabilities, enumerated choices, ranking scores); it is named after TypeSafe's Jev and was released in September 2026.
TypeSafe's Jev launched on September 15, 2026, priced at $0.042 per million input tokens, and is accessible via waitlist, OpenRouter and Vercel AI Gateway.
clef-omni is the third model in a family only ten days old; Cloudflare released Clef and Clef-flash on October 1 as an open-weights response to Jev; Jev is TypeSafe's decision model, released on September 15.
The TypeSafe team revealed that just a few weeks after launch, 25% of Fortune 500 companies were already using Jev.
Drex v2.0's API contract /v1/systemone is exactly the same as TypeSafe's Jev, so decision-calling code written for Jev can switch to Drex with almost no changes.
The concepts of System One and System Two come from Daniel Kahneman's Thinking, Fast and Slow; TypeSafe borrows the concept to distinguish two model invocation paths within an agent.
TypeSafe released Jev on September 15, 2026, defining it for the first time as a System One model, borrowing the concept from Thinking, Fast and Slow.
Decision-1 can be called in three ways: the AI SDK's decision API, the OpenAI-compatible Decisions API, and the TypeSafe-compatible API.
The official ToolJet blog showcases a 'Support Ticket Sorter' app generated by a coding agent, using ToolJet MCP to build the app skeleton and TypeSafe's Jev to make the sorting judgments, with 100 synthetic tickets ultimately turned into a reviewable processing queue.
36 more timeline events
All Facts (20)
Jev is a type of front-end model called a 'System 1 model' — fast, cheap, and structured, designed specifically for decision-making; it does not generate text but instead returns probability scores within a predefined set of options.
75%VerifiedJEV is a decision model launched by TypeSafe
65%VerifiedTypeSafe positions Jev as a 'System 1 model,' a concept inspired by the dual-system cognitive theory in Daniel Kahneman's Thinking, Fast and Slow.
65%VerifiedOpenAI launched a product called the Decisions API.
75%VerifiedJev, launched by TypeSafe, is an AI model that does not generate text but only outputs typed decisions with calibrated probabilities.
65%UnverifiedTypeSafe's Jev product lists the same price of $0.042 per million input tokens as Microsoft Decision-1.
50%UnverifiedA decision model is a category of model that takes state (text, JSON, images) and a typed question and returns structured answers (probabilities, enumerated choices, ranking scores); it is named after TypeSafe's Jev and was released in September 2026.
50%UnverifiedThe TypeSafe team revealed that just a few weeks after launch, 25% of Fortune 500 companies were already using Jev.
50%UnverifiedThe concepts of System One and System Two come from Daniel Kahneman's Thinking, Fast and Slow; TypeSafe borrows the concept to distinguish two model invocation paths within an agent.
50%UnverifiedDrex v2.0's API contract /v1/systemone is exactly the same as TypeSafe's Jev, so decision-calling code written for Jev can switch to Drex with almost no changes.
50%UnverifiedDecision-1 can be called in three ways: the AI SDK's decision API, the OpenAI-compatible Decisions API, and the TypeSafe-compatible API.
50%UnverifiedTypeSafe is a model platform oriented toward large-model decision-making, whose core idea is to constrain the LLM's free-text output into typed structured results; Jev is the decision model runtime on this platform.
50%UnverifiedDuring this test, when connecting to Jev, the endpoint was set to https://api.typesafe.ai and the decision model used was jev-latest.
50%UnverifiedTypeSafe's Jev defined the fast-decision market category, reaching a $7.5 billion valuation and over $100 million in annualized revenue within a matter of weeks.
50%UnverifiedTypeSafe claims that Jev consumes far fewer tokens than mainstream LLMs.
50%UnverifiedTypeSafe claims that Jev runs significantly faster than mainstream LLMs.
50%UnverifiedTypeSafe's own platform has suspended new user registration due to surging demand, but Jev can be used through aggregation platforms such as OpenRouter and Vercel AI Gateway.
50%UnverifiedJev can be accessed through TypeSafe's official channel or Open Router, and the waitlist has been removed, making it open to everyone.
50%UnverifiedJev is positioned by its developer TypeSafe as the first System 1 model, focused on classification decisions rather than text generation.
50%UnverifiedAccording to TypeSafe, depending on the situation, Jev may be 40 to 200 times faster than traditional LLMs.
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