Perplexity Decider vs. Span-01 Comparison


Perplexity Decider Perplexity	Span-01 Respan	+	+
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About Perplexity Decider is a 27B decision model fine-tuned from Qwen3.8-27B for structured classification and multimodal decision tasks. Rather than generating unrestricted text, it takes an input state and a typed decision schema, then returns the selected result together with calibrated probabilities. The model supports choice decisions for selecting among predefined categories and noul decisions for estimating the probability of a yes-or-no condition. It can also accept images alongside text, allowing applications to make decisions from screenshots or other visual inputs. Example workflows include routing a support request to billing, technical support, or sales, and estimating whether a message expresses urgency. Perplexity reports an overall accuracy of 85.71% across 11 benchmarks, including FinancialPhraseBank, RAGTruth, JudgeBench, TabFact, ContractNLI, Circa, Belebele, and TruthfulQA binary.	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.
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 Teams and developers wanting to self-host structured classification, routing, and multimodal decision workflows with calibrated probabilities	Audience AI, safety, evaluation, and observability teams seeking to detect and score complex behaviors across long production traces with fast, probability-based classification
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 View more images or videos	Screenshots and Videos View more images or videos
Pricing Free Free Version Supported Free Trial Not Supported	Pricing $199 per month Free Version Supported Free Trial Supported
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	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 Not Supported In Person Not Supported	Training Documentation Supported Webinars Not Supported Live Online Supported In Person Not Supported
Company Information Perplexity Founded: 2022 United States huggingface.co/perplexity-ai/pplx-decider-v1-27b	Company Information Respan Founded: 2023 United States www.respan.ai/blog/introducing-span-1
Alternatives Clef-flash Cloudflare	Alternatives Clef-flash Cloudflare
Clef Cloudflare	Clef Cloudflare
Jev TypeSafe AI	Jev TypeSafe AI
Perplexity Decisions API Perplexity	Tev1 Together AI
Solar Decide Upstage View All	Microsoft-Decision-1 Microsoft View All
Categories AI Decision Models Supported	Categories AI Decision Models Supported

Integrations 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 Perplexity Decisions API Supported PostHog Not Supported Python Not Supported Qwen3.8-27B Supported TypeScript Not Supported Vercel Not Supported Show More Integrations View All 2 Integrations	Integrations 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 Perplexity Decisions API Not Supported PostHog Supported Python Supported Qwen3.8-27B Not Supported TypeScript Supported Vercel Supported Show More Integrations View All 15 Integrations
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