# Span-01 pricing and access

> Span-01 is Respan's one-pass classifier for agent traces. Its published price is $0.02 per million input tokens, with free output.

Updated 2026-11-04 (Australia/Adelaide)

By Respan · Released: 2026-09-24 · HOSTED

A one-pass classifier for agent traces. For each behaviour you define, it returns the probability that it is present, absent or not observable, without generating text. Its successor, Span-02 (15 Oct 2026), reads images too, can return a number directly, and ships as Apache-2.0 open weights.

## Facts

- Price: $0.02 per million input tokens; output free · [Compare prices](<https://decisionmodels.ai/pricing>)
- Free tier: [Span-01](<https://decisionmodels.ai/models/span-01>) Lite
- Maker: Respan, a Keywords AI product

## Claims and sources

- **VENDOR-REPORTED**: Beats GPT-6 Luna and [Jev](<https://decisionmodels.ai/models/jev>) 1.13 on Respan's own behaviour-detection benchmark [source](<https://respan.ai/blog/introducing-span-1>)

## Links

- [Source: Announcement](<https://respan.ai/blog/introducing-span-1>)
- [Source: Span-02](<https://www.respan.ai/blog/introducing-span-2>)

## Related projects

### Span-01 as a language filter

[Span-01 as a language filter](<https://decisionmodels.ai/projects#project-span01-eval>)

[Source: sunnydachs/span01-eval](<https://github.com/sunnydachs/span01-eval>)

Tests [Span-01](<https://decisionmodels.ai/models/span-01>) Lite as a second check on whether narration text is in the right language, after a regex pass, against a general chat model. The author notes the 23-case test set is small.

- Creator: sunnydachs

- Stars: 1

- Licence: MIT

- Model: [Span-01](<https://decisionmodels.ai/models/span-01>)

- Tags: evaluation, guardrail