Breaking

OpenAI Begins Limited GPT-6 Astra Rollout Two Days After Anthropic Claude Fable 5.1

September 3, 2026 at 18:53 EDT

Foundation Models
AI Agents

OpenAI began a limited rollout of GPT-6 Astra on September 3, 2026, two days after Anthropic made Claude Fable 5.1 generally available. The new OpenAI flagship matches Fable 5.1 on headline API pricing, but it is not yet in most ChatGPT accounts.

September 3, 2026 · OpenAI

GPT-6 Astra starts limited

Two days after Anthropic made Claude Fable 5.1 generally available, OpenAI introduced GPT-6 Astra at the same $10/$50 token price — with day-one access limited to a small set of organizations.

2 days

Between Fable 5.1 GA and the Astra announcement

$10/$50

Shared input/output list price per million tokens

100k+

GPUs used to pretrain Astra, OpenAI’s largest run

2.5×

Astra list price vs GPT-5.6 Sol’s $4/$20

Terminal-Bench Science 0.1

Vendor-reported accuracy. Column height is proportional to the score.

64.6%

GPT-6 Astra

52.6%

Fable 5.1

24.7%

Fable 5

22.4%

GPT-5.6 Sol

Generally available

Claude Fable 5.1

Live since September 1 on the Claude API and major clouds. Partners report stronger long-horizon coding; independent tests still flag higher latency and disputed max-effort savings.

Limited day one

GPT-6 Astra

Announced September 3 for Trusted Access and Daybreak first. Paying ChatGPT users report the model is not yet in their accounts; extra cyber monitoring can pause or stop tasks.

Astra meets OpenAI’s Critical cyber threshold, so the launch is staged on purpose.

Daybreak / Trusted Access firstPlus–Enterprise promised in coming daysEnterprise off by defaultMonitoring can pause work

Continue reading

The rest of this article is for AI News Blitz readers. Choose an option below to keep reading.