Anthropic Claude News

This feed includes only recent releases, roughly from the last 12 months, not the full historical archive. That is why a long-established product may have only a few news items.

5 news

Anthropic Claude
Anthropic's View on Open Weights

Anthropic, through Dario Amodei, denied allegations of lobbying for a ban on open-weights models: the company says it never supported a ban and is promoting three measures - chip export controls against China, countering industrial-scale distillation, and mandatory pre-release safety testing for any sufficiently powerful model regardless of weight openness. Anthropic itself does not publish weights for any model in its lineup.

Llama and Qwen publish weights; Anthropic backs mandatory testing, not a ban on open weights, while remaining fully closed itself Meta Llama →Qwen is explicitly mentioned in the context of distillation and the competition between Chinese open models and the frontier Alibaba Qwen →
Anthropic Claude
Claude Opus 5 Release

Opus 5 leads Frontier-Bench and GDPval-AA, but trails Mythos 5 on cybersecurity tasks. Pricing is unchanged: $5/$25 per million input/output tokens, the same as Opus 4.8. It is the default in Claude Max and the top model in Claude Pro. The weights are closed, with access only through the API (claude-opus-5) and cloud.

Qwen offers open weights for self-hosting; Opus 5 is available only through Anthropic's or partners' cloud Alibaba Qwen →
Anthropic Claude
Access to Claude Fable 5 restored after jailbreak

Fable 5 and Mythos 5 (launched in June 2026) were suspended by the U.S. Department of Commerce after a jailbreak was discovered. Access was restored on 2026-07-01 with a new classifier blocking more than 99% of exploit repeats; flagged requests are routed to Opus 4.8. Anthropic, together with Amazon, Microsoft, and Google, proposed an industry jailbreak severity scale, CJS-0 through CJS-4 (Glasswing project).

A jailbreak classifier and the CJS scale - the vendor equivalent of what an independent LLM Security Gateway handles at the gateway level for any model LLM & Security Gateway →
Anthropic Claude
Release of Claude Sonnet 5

Sonnet 5 replaced Sonnet 4.6 as the default for Free/Pro on 2026-07-01 and is close to Opus 4.8 on agentic tasks such as planning, tools, and browser/terminal use. Launch pricing is $2/$10 per million input/output tokens until 2026-08-31, then $3/$15. The weights are closed, with API/cloud access only.

Qwen offers open weights for self-hosting in your own environment; Sonnet 5 is cloud-only with a limited launch discount Alibaba Qwen →
Anthropic Claude
Release of Claude Opus 4.5

The flagship completed the 4.5 line after Sonnet 4.5 (Sep. 2025) and Haiku 4.5 (Oct. 2025): 200K-token context, output up to 64K, and an effort parameter that balances quality and cost (medium effort delivers Sonnet 4.5-level SWE-bench performance with 76% less output-token usage). Weights are closed - access only through Claude.ai/Code/API and the AWS Bedrock, GCP Vertex, and Azure Foundry clouds.

Llama publishes weights for self-hosting; Opus 4.5 is a closed model available only through the vendor's cloud Meta Llama →

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