Reviewed and written up.
New
Added Nov 10, 2026
Claude Fable 5.2 is Anthropic's November 9, 2026 update to Fable 5.1, released alongside Claude Mythos 5.2, which is the same underlying model with fewer cyber and biology safeguards. Anthropic says it improves on coding, reasoning and vision, generates output up to 30% faster than Fable 5.1, and uses fewer tokens per task at Medium effort. On the Claude Platform it is claude-fable-5-2 at $8 per million input tokens and $40 output, down from $10 input; a fast mode that generates up to 2.5 times faster costs $16 and $80. It is available on the Claude Platform, AWS, Google Cloud and Microsoft Azure, and in Claude plans that include Fable.
Why: It is the strongest generally available Claude model, and the price went down rather than up. Anthropic's own launch table puts it ahead of Opus 5.5, GPT-6 Astra and Gemini 4 Carbon on most of the agentic coding and computer-use benchmarks it reports, and it blocks far fewer legitimate requests than Fable 5.1. Anthropic still recommends Opus 5.5 as the everyday model for most coding and knowledge work, with Fable 5.2 as the advisor or orchestrator above it.
New
Added Nov 10, 2026
Muse Ember is Meta Superintelligence Labs' November 9, 2026 model, the fourth under the Muse brand and its lightest. Meta built it for the work agents repeat all day: tool calls, coding subtasks, routing, extraction and long-document parsing, and pitches it as the worker paired with Muse Wonder as the planner. It takes text, images and audio, so an agent can read screenshots, charts and scanned documents or work from voice memos and recordings without a second model. TechCrunch reports it at 10 cents per million input tokens.
Why: Cheap worker models are where agent bills are won or lost, and Ember arrives priced at 10 cents per million input tokens with multimodal input built in. Meta's launch chart puts it ahead of Anthropic's Haiku and OpenAI's Luna on cost per task against the Artificial Analysis index, though that comparison is Meta's own.
New
Added Nov 10, 2026
Claude Mythos 5.2 is the same underlying model as Claude Fable 5.2, released November 9, 2026, without some of Fable's cybersecurity and biology safeguards. Access is restricted: security professionals apply through Anthropic's Cyber Verification Program, life-sciences researchers through the Life Sciences Verification Program, and Claude Enterprise customers get it inside Claude Security. Anthropic reports it finds more vulnerabilities than Opus 5.5 and Mythos 5.1, and it shares Fable 5.2's listed price of $8 per million input tokens and $40 output.
Why: For the teams who can get it, it is the strongest Claude for vulnerability research and protein design, and Anthropic reports it is much less likely than Mythos 5.1 to reach outside its sandbox in adversarial tests. It ranks low here only because most readers cannot use it.