Anthropic said it blocked multiple accounts that used its Claude AI models in ways that could support biological weapons development, identifying about 35 "distinct research efforts" with potentially …
Anthropic's Claude Fable 5.1, launched September 1, 2026 in GitHub Copilot, is one of only two Claude models in that product that cannot run unless Anthropic retains prompts and outputs, with zero-dat…
Arena.ai analyzed tens of thousands of benchmark responses and found that Anthropic's Claude Fable 5.1 writes in a more matter-of-fact but more verbose style than its predecessor, Claude Fable 5, with…
A blind benchmark of 50 one-shot website-generation prompts found Anthropic's Claude Fable 5.1 beat Fable 5 in human preference 30 times to 17, with 3 ties, and was favored by an AI visual judge 40 ti…
Anthropic's Claude Fable 5.1, released September 1, introduces three breaking API changes, including a silent production issue where forcing a specific tool call now returns a 400 error. Developers mu…
Anthropic's Claude Fable 5 reasoning engine keeps deep thinking enabled for every request, replacing the on/off toggle with an 'effort' control that lets developers dial reasoning depth from low to ma…
OpenAI's GPT-6 Astra completed a block-into-bowl robotic manipulation task in 19 of 20 trials (95%) versus Anthropic's Claude Fable 5.1 at 8 of 20 (40%) and Fable 5 at 1 of 20 (5%), running in 2.5 min…
Neon's benchmark of 42 AI models on a synthetic support-ticket workload found GPT-5 Nano was the cheapest at $0.947 per 100 tickets, while GPT-5.5 Pro was the most expensive at $8.34, and GPT-5.3 Code…
OpenAI, the $852bn startup behind ChatGPT, announced GPT-6 Astra on Thursday, claiming it is the 'world's most intelligent and aligned' AI model with perfect or near-perfect scores on key reasoning be…
OpenAI launched GPT-6 Astra on 3 September 2026, claiming it is its most capable model, but independent evaluations from Artificial Analysis show it scores close to GPT-5.6 Sol on the Intelligence Ind…
The Pentagon says Anthropic remains a designated 'supply chain risk' despite a federal judge's August 27 ruling that the blacklisting violated the company's First and Fifth Amendment rights, while Com…
Babylonian Twins creator Nour El-Rayes ported his 1993 Amiga 500 game to Godot 4 using an LLM (Claude Fable 5) to read the original 72,758 lines of 68000 assembly, completing all three planned steps—i…
Anthropic shipped Claude Fable 5.1 on September 1, cutting cache read prices by 75% from $1.00 to $0.25 per million tokens, which reduces the real cost of highly agentic workloads by up to 45%. The mo…
Anthropic's documentation for Claude Fable 5.1 and Claude Mythos 5.1 details behavioral differences and prompting patterns, advising users to test all effort levels (low, medium, high, xhigh, max) bec…
Anthropic removed over 80% of Claude Code's system prompt for Claude Opus 5 and Claude Fable 5 with no loss in coding evaluations, demonstrating that system prompts have a shelf life as models improve…
Anthropic's Claude Fable 5.1 has topped the Artificial Analysis Intelligence Index with a score of 66, the highest ever recorded, but at $3.69 per task it is the most expensive model tracked, costing …
Claude Fable 5.1, evaluated pre-release by Artificial Analysis, scored 66 on the Artificial Analysis Intelligence Index at max effort, the highest score measured, surpassing Claude Opus 5 (63), Claude…
OpenAI says its upcoming Astra model can find previously unknown software flaws and turn them into working attacks without human guidance, making it the first model classified as having 'Critical' cyb…
Anthropic received a U.S. government directive on June 12 that forced it to take two of its most capable AI models, Claude Fable 5 and Claude Mythos 5, offline worldwide for nearly three weeks. The co…
Anthropic launched Claude Fable 5.1 and Claude Mythos 5.1, with Fable 5.1 priced an estimated 25% less than Fable 5 for typical token-billed workloads and up to 45% less for highly agentic workloads d…