What Is Claude Opus 5? Anthropic's Cheaper Frontier AI Model
Claude Opus 5 is Anthropic's new mid-tier AI model — nearly matching flagship Fable 5's performance at half the token price. Here's what it is and what it costs.
Read more →Claudeand Frontier AI
Every AI News story tagged with both Claude and Frontier AI — the two topics side by side, updated as new articles publish.
14 articles
Anthropic Launches Claude Opus 5, Rivaling Fable 5 at Half Cost
Anthropic released Claude Opus 5 on July 24, pairing near-flagship coding and agent performance with Claude Fable 5's results at roughly half the cost, plus gains in science and finance tasks.
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What Is Claude Fable 5? Anthropic's Flagship AI Model, Explained
Claude Fable 5 is Anthropic's most capable publicly available AI model. Here's what it is, how it differs from Claude Mythos 5, and what it costs to use.
Read more →Claude Fable 5 Helps Disprove 87-Year-Old Jacobian Conjecture
Anthropic mathematician Levent Alpöge used Claude Fable 5 to find a counterexample to the 1939 Jacobian conjecture, and mathematicians including Terence Tao independently verified it within days.
Read more →What Is Claude Mythos 5 — and Why Is Its Access So Restricted?
Claude Mythos 5 is Anthropic's cybersecurity-focused AI model, built to hunt software vulnerabilities — and available to only about 100 vetted partners, not the public.
Read more →China's GLM-5.2 Rivals US Frontier AI at One-Sixth the Cost
Z.ai has released GLM-5.2, a 744-billion-parameter open-weight model that matches GPT-5.5 on key benchmarks and trails Claude Opus 4.8 narrowly — trained entirely on Huawei silicon with no Nvidia hardware.
Read more →Fable 5 Returns Globally After US Lifts 19-Day Export Controls
Anthropic restored global access to Claude Fable 5 on July 1 after the US Commerce Department lifted export controls imposed 19 days earlier, following a jailbreak discovered by Amazon researchers.
Read more →Z.ai's GLM-5.2 Matches US Frontier AI at One-Sixth the API Cost
GLM-5.2, released on June 16 by Beijing startup Z.ai, sits alongside Claude Opus 4.8 and GPT-5.5 on coding benchmarks while carrying an API price roughly one-sixth that of closed US models.
Read more →Anthropic Restores Fable 5 Globally After US Lifts Export Controls
Claude Fable 5 returned to users worldwide on July 1 after the US Commerce Department lifted a 19-day export control that had suspended the flagship model following the discovery of a jailbreak technique.
Read more →Austria Lobbies EU to Host Anthropic After US AI Model Export Ban
Austria's State Secretary for Digitalization has urged the European Commission to explore bringing Anthropic to the EU, after US export controls cut off European access to Claude Fable 5 and Mythos 5.
Read more →Anthropic Lifts Claude Fable 5 Ban and Proposes Industry Jailbreak Severity Framework
Anthropic is restoring global access to Claude Fable 5 starting July 1, three weeks after a US export control order, and is rolling out a four-criteria jailbreak severity framework developed with Amazon, Microsoft, and Google.
Read more →US Clears Claude Mythos 5 for Critical Infrastructure After Two-Week Ban
The Trump administration authorized Anthropic to restore Claude Mythos 5 access for roughly 100 US critical infrastructure organizations, ending a two-week suspension. The consumer-facing Fable 5 model remains offline pending further negotiations.
Read more →ByteDance Doubao Seed 2.1 Claims Parity With GPT-5.5 on Agent Tasks
ByteDance launched Doubao Seed 2.1 Pro and Turbo on June 23, claiming top scores on coding and agent benchmarks and parity with GPT-5.5 and Claude Opus 4.7.
Read more →US Lifts Partial Ban on Anthropic's Mythos 5 for 100+ Institutions
The Trump administration has cleared Anthropic to restore Claude Mythos 5 access for over 100 US companies and federal agencies, two weeks after a global ban imposed over security concerns.
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