Perplexity Agent API Adds GPT-5.6 Family, Gemini 3.6 Flash, and Grok 4.5 at First-Party Pricing

What is new

• GPT-5.6 family: openai/gpt-5.6-sol, openai/gpt-5.6-terra, openai/gpt-5.6-luna now in Agent API at first-party OpenAI pricing.
• Gemini 3.6 Flash + 3.5 Flash-Lite: Latest Google models accessible via Perplexity API.
• Grok 4.5: xai/grok-4.5 added to the model portfolio.
• Sonar consolidation: Sonar Chat Completions merged into the unified Agent API covering more models, tools, and research-backed presets with a single consistent interface. Migration guide available.
• Retirement: google/gemini-3.1-flash-lite-preview — migrate to google/gemini-3.1-flash-lite.

Why it matters

Perplexity Agent API is becoming a multi-vendor aggregation layer centralizing frontier models from OpenAI, Google, and xAI with a consistent interface and first-party pricing without managing multiple API keys.

How to try it

Documentation at docs.perplexity.ai — new models are immediately available. Sonar users have a migration guide to the new Agent API endpoint.