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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.
Anthropic has released Claude Opus 5 at the same price as Opus 4.8 (5 USD/25 USD per million tokens), which the company says is half the price of Fable 5. It leads in agentic coding and ARC-AGI-3, while lagging in cyber exploitation and some domains such as healthcare and law.
The recommended replacement for Claude Opus 4.7 in GitHub Copilot is Claude Opus 5.5; the original announcement listed Claude Opus 5. The retirement of four models takes effect on 2 October 2026 across all environments of the service.
New: The recommended replacement for Claude Opus 4.7 is Claude Opus 5.5, not Claude Opus 5.
The Claude Opus 5.5 model from Anthropic is now available in GitHub Copilot for Pro+, Max, Business and Enterprise plans. According to Anthropic, it handles tasks comparably to Opus 5, but with fewer steps and tokens.
Cryptanalysts used the Astra (OpenAI) and Claude Opus 5 (Anthropic) models to decipher two long-unsolved Enigma messages, one undeciphered since 2005. Seven messages remain undeciphered.
Simon Willison generated a pixel-art animation of a kakapo party in HTML5 canvas using the Claude Opus 5.5 model, and using Claude Code with a Playwright script converted it into a 15-second video for a slide at the WeAreDevelopers keynote.
OpenAI has made GPT-6.1 Sol generally available on Amazon Bedrock with enterprise data security controls. The model was released in late September as a cheaper replacement for the postponed GPT-6.1 Astra, with coding performance that, according to OpenAI, approaches that flagship version at one-fifth of the price.
New: GPT-6.1 Sol is available on Amazon Bedrock; It matches the performance of GPT-6 Astra on the DeepSWE v1.1 test set; On DeepSWE v1.1, it outperforms GPT-6 Sol by 6.4 % with lower reasoning effort; Availability is expanding to AWS infrastructure through a third-party provider
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
Kimi K3 (2.8 trillion parameters) from Moonshot AI has also been available on the Amazon Bedrock platform since 18 September 2026, with support for prompt caching and AWS data protection. The model was released in July 2026 as the first open model in the 3 trillion parameter class.
New: Kimi K3 is now available on Amazon Bedrock as a new distribution channel; The model supports prompt caching on Bedrock; Data in AWS Bedrock is protected by the AWS data boundary without being shared with the provider; The Bedrock deployment optimizes the model for long coding and knowledge workflows
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
AWS has released an open-source collection of 38 agent skills for 11 areas of healthcare and life sciences. According to the company, AI agents with these skills win 70–86 % of head-to-head comparisons against agents without them. MIT-0 license.
The Frontier Red Team at Anthropic found that, unlike older models, GLM-5.3 and Claude Mythos Preview were able to perform a full control flow hijack in binary exploitation tests (4 % and 6 %, respectively, of 100 attempts).
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
Anthropic supports federal and state legislation requiring independent safety audits of AI systems, including the Massachusetts bill with a $561 million package. President Trump, by contrast, is betting on industry self-governance without strict regulation.
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