TypeSafe Jev

Jev is a System One model from TypeSafe. ThinkThen asks it when you name no backend.

Backend name	`typesafe`
Address	`https://api.typesafe.ai/v1`
Key variable	`TYPESAFE_API_KEY`
Default model	`jev-1.13.0`

The default model is a pinned version. TypeSafe can move an alias to a new model, and the pinned version stays the same. Name another version with --model only when you mean to change the model behind a run.

On 2026-09-29, TypeSafe's public site advertised Jev input at $42 per billion tokens. Check your account terms for the rate you will pay.

Two ways to reach it

With no backend named, ThinkThen posts to the same address with the same model and reads the key from THINKTHEN_API_KEY. With --backend typesafe, it reads the key from TYPESAFE_API_KEY. Both reach the same model, and both share the answer cache.

Jev answers yes. Sending the item back asks for a refund.

question="Does the customer ask for a refund?"

printf '%s\n' "I want to send this back." |
thinkthen decide "$question" --backend typesafe

Output

true

exit 0: yes

One request carries all three lines. The thanks is the only no.

question="Does the customer ask for a refund?"

cat <<'EOF' |
Please refund my order. It arrived broken.
Thanks for the quick help yesterday!
I want to send this back.
EOF
thinkthen decide "$question" \
  --lines \
  --backend typesafe

Output

{"input":"Please refund my order. It arrived broken.","value":true}
{"input":"Thanks for the quick help yesterday!","value":false}
{"input":"I want to send this back.","value":true}

exit 0: the run finished

Check it

thinkthen check sends four fixed questions and reports whether the backend answers each one the way ThinkThen needs. The plan shows where they would go.

The check would post to TypeSafe's address with Jev's pinned model. The plan sends nothing.

thinkthen check \
  --backend typesafe \
  --plan |
head -n 4

Output

url https://api.typesafe.ai/v1/systemone
provider systemone
model asked unspecified
model sent jev-1.13.0

exit 0

On 2026-09-26, thinkthen check on build b50e0425c asked jev-1.13.0 and exited 0, with 0 critical and 0 warning findings.The record holds the run.

From your language

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On GitHub: github.com/botassembly/thinkthen