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Anthropic challenges US approach in the Claude Fable 5 and Mythos 5 export control case, responds with jailbreak severity framework

Anthropic challenged the legality and process of the US export controls that led it to temporarily suspend access to the Claude Fable 5 and Mythos 5 models in June 2026. In response, it published a jailbreak severity framework and a program for reporting jailbreaks.

New: Export control issued due to concerns about a jailbreak and the model's cyber capabilities; Anthropic challenged the legality of the export control and the lack of a clear process; Anthropic responded by publishing a jailbreak severity framework

Claude Opus 5.5 available on Amazon Bedrock with lower costs per task

Anthropic, together with AWS, has made Claude Opus 5.5 available on Amazon Bedrock – according to the company, it is more efficient and cheaper per task than Claude Opus 5, with adaptive thinking and stricter safety classifiers.

OpenAI halved prices for the GPT-6 Sol and Luna models; independent analysis does not confirm a performance improvement

OpenAI released the GPT-6 Sol and Luna models on 22 September 2026 at prices 50% lower than GPT-5.6 (Sol 2/10 USD, Luna 0.10/0.50 USD per million tokens). However, an independent analysis by Artificial Analysis shows that actual capabilities remain at the level of their predecessors and have even declined on some tasks.

New: Anthropic released Claude Opus 5.5 on the same day (2026-09-23), roughly an hour after OpenAI; Claude Opus 5.5 is 20% cheaper than the previous Opus 5.0 ($4/$20 vs $5/$25); Opus 5.5 improved communication style and token efficiency; The model releases launch a 'price war' between the two largest AI companies; GPT-6 Luna and Sol are part of a broader strategy of price competition, not an isolated release

OpenAI opens the Pro plan to new users, but halves API credits and moves toward payment for actual usage

From 29. 9. 2026, OpenAI is reopening the Pro plan at $200/month to new users and removing the 5-hour usage limit, but at the same time halving API credits per dollar. The company is thus moving from subsidized subscriptions toward payment based on actual usage. This follows the price reduction for the GPT-6 Sol and Luna models on 22. 9.

New: API credits per dollar halved; Pro plan at $200/month reopened to new users; 5-hour window for the weekly allotment removed; Strategic shift from subsidized subscription models to pay-per-use pricing; Microsoft is making similar changes with Copilot

The company xAI has released Grok 4.7 with a lower price but weaker benchmark results than Claude and GPT-6

The company xAI has released Grok 4.7 at $2/million input tokens and $6/million output tokens. On the Artificial Analysis index (v4.3.2), it achieves a score of 46, while Claude Fable 5.1 and GPT-6 lead with a score of 53 each. In the agentic coding test Terminal-Bench 4.0, it scores only 26 %.