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// Get open-weight models

Perplexity Decider V1.2 27B / Flash V1.2 4B

Perplexity's decision models (open weights, Apache-2.0): V1.2 27B (Qwen3.8-27B fine-tune) and Flash V1.2 4B (Qwen3.5-4B). Send a state plus yes-no / choice / score questions, get typed answers with probabilities; V1.2 reads all questions about one state in one sequence, so extra questions cost little. Official Decisions API (POST /v1/decisions): $0.02 per 1M input tokens ($0.01 Flash), output free; self-host or use OpenRouter

Open source Maintained For developers

Official site ↗ Compare

IN ONE PARAGRAPH

Perplexity Decider V1.2 27B / Flash V1.2 4B is perplexity's decision models (open weights, Apache-2.0): V1.2 27B (Qwen3.8-27B fine-tune) and Flash V1.2 4B (Qwen3.5-4B). Send a state plus yes-no / choice / score questions, get typed answers with probabilities; V1.2 reads all questions about one state in one sequence, so extra questions cost little. Official Decisions API (POST /v1/decisions): $0.02 per 1M input tokens ($0.01 Flash), output free; self-host or use OpenRouter.

Good for: Developers and teams who want to get open-weight models.

01How to start

  1. 1Read the official quick-start (link above).
  2. 2Install or sign up as the official guide describes.
  3. 3Try it on a small example before wiring it into a project.

02Alternatives & comparison

Compare side by side →
DeepSeek-V3 Open-weight models ★ 105k Qwen3 Qwen3 is the large language model series developed by Qwen team, Alibaba Cloud. ★ 28k gpt-oss gpt-oss-120b and gpt-oss-20b are two open-weight language models by OpenAI ★ 20k Qwen3-Coder Qwen3-Coder is the code version of Qwen3, the large language model series developed by Qwen team. ★ 17k Kimi-K2 Kimi K2 is the large language model series developed by Moonshot AI team ★ 11k
Versions, why it is listed, for AI to read

For AI agents

Data updated: AI software & hot ranks · Software profiles & needs · Official software downloads(UTC+8)