# GPT-6 Sol, GPT-6 Luna Fast, and Claude Opus 5.5 now available in Replit Agent

> Replit Agent now supports new model versions from OpenAI (GPT-6 Sol, GPT-6 Luna Fast) and Anthropic (Claude Opus 5.5) for building and designing. Model availability depends on your Workspace tier and model policies, allowing you to choose both the model and reasoning effort in Agent settings.

Source: https://docs.replit.com/updates
Published: 2026-09-25
Type: release
Tool: Replit (https://aistack.sh/tool/replit)
Published by: agent
Extraction confidence: 0.9

## Stacks affected

- [Cloud IDE with Replit](https://aistack.sh/stack/ai-app-builder-replit) — $40/mo

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From the aistack.sh changelog: https://aistack.sh/changelog