Chat GPT Astra Setup Guide (Full Beginner Guide)

On 1st September 2026, Anthropic released Claude Fable 5.1.

Claude@claudeai

We’re introducing Claude Fable 5.1 and Claude Mythos 5.1. They're the world’s most advanced models for coding and knowledge work.

6:03 PM · Sep 1, 2026 · 20.9M Views

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2.89K Replies · 7.37K Reposts · 65.7K Likes

Then, on 3rd September, OpenAI released GPT-6 Astra.

OpenAI@OpenAI

This is GPT-6 Astra. Anything you can do on a computer, Astra can do for you. Fast.

7:32 PM · Sep 3, 2026 · 137M Views

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9.02K Replies · 35.4K Reposts · 340K Likes

Since its release, one model has been receiving lots of praise on social media.

Lots of people are saying things like “Astra is better, cheaper, faster. Cancel Claude.”

I’ve been testing Fable 5.1 alongside Astra on a range of different tasks.

And it turns out Astra is NOT cheaper 😮

This week’s newsletter is a side-by-side look at these two models. It includes:

→ My thoughts on each model’s strengths.

→ Where you can access them

→ How much they actually cost

→ A real live comparison of both models

→ Free Gift

FREE GIFT

This week’s newsletter includes a bonus download: The Two-Model Playbook. The playbook includes a cost calculator, a router to help you decide which model to use based on the task at hand, and a prompt for building Neon Orbit Game. It also includes 20 other prompts: 10 for Claude and 10 for Astra.

Know someone who’s trying to decide between Claude or ChatGPT? Send them along.