Best Model for a Pi-Style Companion

Pi runs on Inflection's own in-house model and doesn't let you swap models — its warmth is part of the product. If you want a Pi-like conversational companion you can point at different models, the best conversational picks are Claude Sonnet 4.6, GPT-5.4, Gemini 3.5 Flash, and Grok 4.3.

Read the full Pi review → · updated 2026-06-22

#1Claude Sonnet 4.6Anthropic · $6.60/1M · 1M ctx

Warm, articulate, and reliable — the closest in feel to a thoughtful conversational companion.

Overall 91/100 · Value 46 · 78% community winFull breakdown →

#2GPT-5.4OpenAI · $6.25/1M · 1.1M ctx

A friendly, capable generalist for everyday conversation and brainstorming.

Overall 90/100 · Value 46 · 77% community winFull breakdown →

#3Gemini 3.5 FlashGoogle · $3.75/1M · 1.0M ctx

Fast and personable at a low price — good for lots of casual back-and-forth.

Overall 89/100 · Value 52 · 77% community winFull breakdown →

#4Grok 4.3xAI · $1.63/1M · 1M ctx

Conversational and quick, with a more candid personality.

Overall 84/100 · Value 62 · 75% community winFull breakdown →

FAQ

Can you change Pi's model?

No — Pi uses Inflection's own model and isn't model-swappable; its conversational style is part of the product. For a companion you can point at different models, use a general assistant in a model-agnostic app.

What model feels most like Pi?

Claude Sonnet 4.6 tends to come closest in warmth and coherence for open-ended conversation, with GPT-5.4 and Gemini 3.5 Flash as strong, cheaper alternatives.

The model is half the story — the agent is the other half

The model picks the moves; the agent runs the loop, the tools, and the guardrails. Once you've chosen a model, see which agent gets the most out of it.

Compare AI agents →