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Span-01

Free
respan/span-01

— context · Sep 2026 · 1 upstreams

Span-01 is a behavior-scoring classifier from Respan, a 4B model trained with RLAIF on classification reasoning rather than fixed taxonomies. Send a conversation span and a set of plain-language behavior definitions and get a present / absent / not_observable probability per behavior in a single forward pass, with no token-by-token generation. It is the full tier of the family; Span-01 Lite is the lighter tier. Call POST /api/v1/decisions (POST /api/v1/systemone is the same handler).

Bring your own keyAnyRouter has no platform route for Span-01. Requests use your key and bill your provider account. AnyRouter adds no fee.
context
—
input, via anyrouter/decision
Free
output, not token-billed
n/a
question types
noul · choice · score

Upstreams

1
  1. 1OpenRouterYour key · not addedyour planTPS —TTFT ——

Try it

Ask a typed question, read the probabilities

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Details

Owner
Respan
Kind
Decisions
Released
Sep 2026
Data policy
Provider retention
Endpoint
/api/v1/decisions

Quick start

curl https://anyrouter.dev/api/v1/decisions \
  -H "Authorization: Bearer $ANYROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "state": "Help! My payouts have been failing for 3 days.",
  "model": "respan/span-01",
  "questions": {
    "is_urgent": {
      "type": "noul",
      "instructions": "Does this convey urgency?"
    }
  }
}'