July 2026

Opus 5 launches at the same price as Opus 4.8

Anthropic says it "comes close to the frontier intelligence of Claude Fable 5 at half the price." It costs $5 per million input tokens and $25 per million output, with a 1M token context window.

Source:AnthropicClaude Platform release notes

Opus 5 sends some blocked cyber requests to Opus 4.8

Anthropic expects Opus 5's cyber classifiers to step in around 85% less often than on Fable 5. In Claude.ai, Claude Code and Claude Cowork, flagged requests fall back to Opus 4.8 by default.

Source:Anthropic

Fast mode for Opus 4.7 is gone

Fast requests to Opus 4.7 now return an error, with no fallback to standard speed. Opus 4.7 stays available at standard speed.

Source:Claude Platform release notes

Claude's voice mode now runs on Opus and Sonnet, not only Haiku

You can pick Opus or Sonnet and switch models mid-conversation. Voice mode can also reach connected tools like Gmail and Slack, and asks permission before using one.

Source:Anthropic

MCP's new spec drops sessions

The 2026-07-28 spec makes MCP a stateless request/response protocol. Anthropic says support is rolling out across Claude products.

Source:MCP blogAnthropic

You can add or remove tools mid-conversation and keep the prompt cache

It is a beta. It works on Fable 5, Mythos 5, Opus 4.8 and Opus 5.

Source:Claude Platform release notes

Anthropic says Claude got into three real organizations' systems during security tests

Anthropic reviewed 141,006 test runs and found three incidents. Claude was told it had no internet access, but a misunderstanding with the outside partner running the setup left it online.

Source:Anthropic

Anthropic says Mythos Preview found better attacks on two cryptography methods

The attacks are on HAWK, a candidate post-quantum signature scheme, and on a 7-round version of AES. Anthropic says neither has a practical impact on today's systems.

Source:Anthropic

1,134 AI company employees sign a letter asking the US for tools to pace AI

The letter is called Pacing the Frontier. NBC News says it does not explicitly call for a slowdown or pause.

Source:The Next WebNBC News

Shared Claude chats and Artifacts showed up in Google search

TechCrunch reports some could be found with the search "site:claude.ai/share." Anthropic told TechCrunch that share links only show up in search when posted where search engines can see them.

Source:TechCrunchWIRED

AMD and Anthropic announce a chip deal of up to 2 gigawatts

Anthropic will deploy up to 2 gigawatts of AMD Instinct MI450 Series GPUs, starting in the first half of 2027. AMD has committed to an equity investment of up to $5 billion in Anthropic "in the future."

Source:AMD

Anthropic's deputy CISO says Claude writes about 80% of the code it merges

Jason Clinton says human engineers own final approval. He says the share of pull requests with substantive review comments grew from 16% to 54%.

Source:Anthropic

A judge gave final approval to Anthropic's $1.5 billion book settlement

TechCrunch, citing Reuters, says it pays $3,000 per work across an estimated 500,000 works.

Source:TechCrunch