Anthropic releases Claude Fable 5.2 and Mythos 5.2, pairing new, record-high benchmarks with 20% API cost reduction
By Google News AI ·
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What's better than a new frontier model? Try two, both of them achieving new high scores on a variety of third-party benchmarks — all with a 20% cost reduction over API for enterprises and developers.
That's exactly what Anthropic has done today: less than an hour ago, the fast-growing generative AI startup announced Claude Fable 5.2 and Claude Mythos 5.2, its latest, most powerful frontier language models for general usage and cyber workflows, respectively, and the results across the board are, once again, nothing short of impressive — dare we say, potentially industry-changing.
Both models now cost $8 per million uncached input tokens and $40 per million output tokens, down from $10 and $50 for their predecessors in the 5.1 generation, respectively.
Fable is available right now on paid Claude plans, in Claude Code and through the Claude Platform (model ID claude-fable-5-2), AWS, Google Cloud and Microsoft Azure.
Mythos uses the same underlying model with different safeguards and is reserved for vetted cybersecurity and life sciences users in Anthropic's Project Glasswing program.
The most useful number for enterprise engineering teams is likely $6.72. That was the average cost of a task on Cognition’s FrontierCode 2.0 test with Fable 5.2 at High effort, according to Anthropic's System Card on the new models.
Opus 5.5, which charges half as much for standard uncached input and output, averaged $12.82 at Max for a nearly identical score. The trade can also go the other way. Turning Fable all the way up to Max drove the average cost to $44.70 and brought its score below what it achieved at the cheaper Xhigh setting, according to Anthropic’s system card.
That makes Fable an interesting option for jobs that already burn time and money in retries, such as a migration across an unfamiliar codebase or a bug that survives several rounds of diagnosis. Anthropic itself recommends Opus 5.5 for most coding and knowledge work. Fable can take over an entire job or serve as an advisor that a less expensive model consults when it gets stuck.
Each setup buys a different amount of Fable’s time.
Less than two weeks after Google unveiled Gemini 4 Carbon, the search giant’s latest frontier model, Anthropic has put up a set of scores that reshuffles the field.
But the two releases look different from the buyer’s side. Google announced Carbon on October 28 and began by giving access to selected cybersecurity defenders through its Fairwind program. Carbon remains in limited release as of November 9.
Most developers who want to put a Gemini 4 model to work today can use Gemini 4 Argon. Anthropic has opened Fable 5.2 much more broadly, while reserving Mythos 5.2 for vetted cybersecurity and life sciences teams.
In Anthropic’s launch comparison, one of the two new Claude models leads on 13 of 15 reported score lines, counting the two ways of scoring the AA-Briefcase knowledge-work test separately.
Anthropic Claude Fable 5.2 and Mythos 5.2 benchmark comparison chart. Credit: Anthropic
Carbon takes the business automation test, 53.9% to Fable’s 51.4%. The other win stays in the Claude family. Opus 5.5 edges Fable on AA-Briefcase’s head-to-head ranking, 1,800 to 1,785, even though Fable more often meets the test’s written requirements.
The tally shows the breadth of Anthropic’s gains across its chosen tests. Several rows have no score for Carbon, and Artificial Analysis gave Carbon 59 points on…
Originally published by Google News AI
