# Anthropic unveils Claude Fable 5.2, Mythos 5.2 with coding gains and lower prices

DevFeed: [Anthropic unveils Claude Fable 5.2, Mythos 5.2 with coding gains and lower prices](<https://devfeed.tech/articles/anthropic-unveils-claude-fable-5-2-mythos-5-2-with-coding-gains-and-lower-prices-125035.md>)

Original publisher: [Read original article](<https://www.infoworld.com/article/4246681/anthropic-unveils-claude-fable-5-2-mythos-5-2-with-coding-gains-and-lower-prices.html>)

Author: Prasanth Aby Thomas

Published: 2026-11-10T09:29:53Z

Content type: news

Language: en

Sources: [InfoWorld](<https://devfeed.tech/sources/infoworld.md>)

Topics: [Claude](<https://devfeed.tech/topics/claude.md>), [anthropic](<https://devfeed.tech/topics/anthropic.md>), [agentic-coding](<https://devfeed.tech/topics/agentic-coding.md>), [agentic workflows](<https://devfeed.tech/topics/agentic-workflows.md>), [LLM security](<https://devfeed.tech/topics/llm-security.md>), [Frontier AI](<https://devfeed.tech/topics/frontier-ai.md>)

Tags: [agents](<https://devfeed.tech/tags/agents.md>), [ai](<https://devfeed.tech/tags/ai.md>), [ai-agents](<https://devfeed.tech/tags/ai-agents.md>), [anthropic](<https://devfeed.tech/tags/anthropic.md>), [api](<https://devfeed.tech/tags/api.md>), [artificial-intelligence](<https://devfeed.tech/tags/artificial-intelligence.md>), [artificial-intelligence-development-tools-software-development](<https://devfeed.tech/tags/artificial-intelligence-development-tools-software-development.md>), [benchmark](<https://devfeed.tech/tags/benchmark.md>), [budget](<https://devfeed.tech/tags/budget.md>), [claude](<https://devfeed.tech/tags/claude.md>), [claude-fable-5-2](<https://devfeed.tech/tags/claude-fable-5-2.md>), [coding](<https://devfeed.tech/tags/coding.md>), [cybersecurity](<https://devfeed.tech/tags/cybersecurity.md>), [development-tools](<https://devfeed.tech/tags/development-tools.md>), [effort](<https://devfeed.tech/tags/effort.md>), [engineering](<https://devfeed.tech/tags/engineering.md>), [enterprises](<https://devfeed.tech/tags/enterprises.md>), [faster](<https://devfeed.tech/tags/faster.md>), [frontiercode-2-0](<https://devfeed.tech/tags/frontiercode-2-0.md>), [language-en](<https://devfeed.tech/tags/language-en.md>), [migrations](<https://devfeed.tech/tags/migrations.md>), [mythos](<https://devfeed.tech/tags/mythos.md>), [mythos-5-2](<https://devfeed.tech/tags/mythos-5-2.md>), [prices](<https://devfeed.tech/tags/prices.md>), [software-development](<https://devfeed.tech/tags/software-development.md>), [storytype-news](<https://devfeed.tech/tags/storytype-news.md>)

## AI overview

Anthropic says Claude Fable 5.2 and Mythos 5.2 use the same underlying model with different safeguards: Fable is broadly available, while direct Mythos access is limited to vetted cybersecurity and life sciences organizations. Both cost $8 per million input tokens and $40 per million output tokens, 20% below their predecessors; Anthropic also reports up to 30% faster output. Fable scored 49.1% on FrontierCode 2.0 at Xhigh effort, versus 32.4% for Fable 5.1. At High effort, Anthropic says it matched Opus 5.5's highest-setting coding score at roughly half the cost per task, though actual savings depend on workload and effort. In an internal test, Mythos 5.2 rediscovered 89.6% of 1,829 known vulnerabilities, compared with 78.3% for 5.1. Enterprise access through Claude Security is available without joining Mythos verification programs. The excerpt also highlights limits: agent reliability and coordination challenges, need for monitoring, isolation and human approval of critical changes, and 30-day safety retention for customers without zero-retention arrangements.

## Source excerpt

Anthropic has introduced Claude Fable 5.2 and Mythos 5.2, claiming significant improvements in handling complex software engineering tasks while cutting API prices by 20% compared with the previous versions. Fable 5.2 and Mythos 5.2 share the same underlying model but have different safeguards. Fable is broadly available, while direct access to Mythos is restricted to vetted cybersecurity and life sciences organizations to limit potential misuse. The models are both priced at $8 per million input tokens and $40 per million output tokens, down from $10 and $50, respectively. Anthropic said the newer versions can generate output up to 30% faster than their predecessors. The company reported substantial gains in coding performance. Fable 5.2 scored 49.1% on the FrontierCode 2.0 benchmark at its Xhigh effort setting, compared with 32.4% for Fable 5.1. The benchmark assesses whether maintainers of open-source projects would accept AI-generated changes to their code. Performance and costs could entice enterprises The models' improved performance and lower prices could make long-running AI agents viable for software migrations and scientific research, according to Lian Jye Su, chief analyst at Omdia. Higher task completion rates could further reduce deployment costs, he said. Anthropic said Fable 5.2 at its "High effort" setting achieved a coding benchmark score comparable to Opus 5.5 at its highest setting, at roughly half the cost per task. The comparison suggests that Fable could be more economical for some demanding assignments, although the savings would depend on the workload and effort setting. "Anthropic has cut the price of a token, not the price of a thought," said Sanchit Vir Gogia, chief analyst at Greyhound Research. He urged CIOs to treat AI processing effort as a budget consideration and measure costs against successfully completed tasks. Anthropic also recommends Opus 5.5 for most coding and knowledge work, with Fable and Mythos intended for more demanding