Span-01

Span-01

Respan
Tev1

Tev1

Together AI
+
+

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About

Span-01 is a hyper-parallel reasoning classifier built to detect complex behaviors across long production traces in a single forward pass. Rather than generating tokens sequentially, it reasons over natural-language behavior definitions and returns direct probabilities for present, absent, and not_observable. The model is trained for general classification reasoning with RLAIF before being specialized for behavior detection, allowing it to apply previously unseen definitions to new behaviors and domains instead of relying on a fixed taxonomy. At inference time, hyper-parallel definition branches evaluate multiple behaviors against the same trace context simultaneously, while hybrid attention helps preserve reasoning over long, complex inputs. Span-01 is designed for production monitoring across safety, reliability, grounding, agent behavior, and response quality, including jailbreak and prompt injection detection, privacy, and secrets.

About

Tev1 is a fast decision and classification model built by Together AI and fine-tuned from Qwen3.5 4B. It is designed around a simple interface: provide a piece of state, a question, and 2 to 24 labeled options, and the model returns exactly one letter that software can map back to a semantic key. This structure supports production tasks such as routing support tickets, evaluating automated returns, applying policy rules, rating sentiment, categorizing documents, and inserting deterministic decision points into larger agent pipelines. The model has 4.7B parameters, a 32.8K-token context window, and runs with non-thinking generation for fast, predictable classification. It was trained on 37,840 examples spanning intent detection, boolean comprehension, sentiment, policy application, routing, news categories, and research-paper taxonomy. Recommended settings use temperature 0 and a very small output budget so responses remain stable and easy to parse.

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

AI, safety, evaluation, and observability teams seeking to detect and score complex behaviors across long production traces with fast, probability-based classification

Audience

Developers and AI engineering teams seeking to route, classify, score, and apply policy decisions through fast, deterministic structured outputs

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Supported

API

Offers API Supported

Screenshots and Videos

Screenshots and Videos

Pricing

$199 per month
Free Version Supported
Free Trial Supported

Pricing

$0.04 per 1M tokens
Free Version Supported
Free Trial Not Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

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Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation Supported
Webinars Not Supported
Live Online Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

Respan
Founded: 2023
United States
www.respan.ai/blog/introducing-span-1

Company Information

Together AI
Founded: 2022
United States
www.together.ai/models/tev1-4b-experimental

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Cloudflare
Clef

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Cloudflare
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Clef

Cloudflare
Jev

Jev

TypeSafe AI
Jev

Jev

TypeSafe AI
Tev1

Tev1

Together AI

Categories

AI Decision Models Supported

Categories

AI Decision Models Supported

Integrations

Python Supported
TypeScript Supported
AssemblyAI Supported
Cognee Supported
Google GenAI SDK Supported
JavaScript Supported
LangChain Supported
LinkUp Supported
LlamaIndex Supported
Mastra AI Supported
Mem0 Supported
OpenAI Supported
OpenAI Agents API Supported
PostHog Supported
Qwen3.5 Not Supported
Vercel Supported

Integrations

Python Supported
TypeScript Supported
AssemblyAI Not Supported
Cognee Not Supported
Google GenAI SDK Not Supported
JavaScript Not Supported
LangChain Not Supported
LinkUp Not Supported
LlamaIndex Not Supported
Mastra AI Not Supported
Mem0 Not Supported
OpenAI Not Supported
OpenAI Agents API Not Supported
PostHog Not Supported
Qwen3.5 Supported
Vercel Not Supported
Claim Span-01 and update features and information
Claim Span-01 and update features and information
Claim Tev1 and update features and information
Claim Tev1 and update features and information