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Long Story Video Skill
Let Claude Fable 5.2 orchestrate a 10s–10min story, handling scripts, prompts and footage end to end.
Ads Video Skill
Claude Fable 5.2 drafts the script, prompts and footage for a product ad in a single pass.
3D Science Explainer Video Skill
Turn a hard research result into a 3D explainer animation
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Claude Fable 5.2
Meet Claude Fable 5.2: sharper coding, deeper reasoning, and vision for your toughest projects — plus up to 30% faster output.
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What Sets Claude Fable 5.2 Apart
Claude Fable 5.2 from Anthropic tackles your boldest technical challenges, from large-scale code migrations to unsolved physics questions.
- Production-Ready Coding ExpertiseOver 90% of changes in Anthropic's core codebase now come from Claude. Claude Fable 5.2 resolved persistent bugs in minutes and migrated a critical service from Python to Rust, boosting startup speed about 26x.
- Breakthroughs in Science and MathClaude Fable 5.2 solved two open problems in black hole physics via holographic duality and formalized Fermat's Last Theorem proof in just 30 hours.
- Built-in Safeguards and Verified Mythos AccessFable 5.2 and Mythos 5.2 share one model: Fable includes cybersecurity and biology safeguards for public use, while security and biomedical teams can apply for Mythos via Life Sciences and Cyber Verification Programs.
Deploying Claude Fable 5.2: A Quick Guide
Align the model tier, effort level and mode with the complexity of your technical task.
Claude Fable 5.2: Benchmarks & Core Capabilities
Explore FrontierCode, Chartography, WANDR, HLE and BenchCAD scores, plus long-horizon agent orchestration, Mythos 5.2 vulnerability discovery and MHS hardware control.
FrontierCode Merge-Quality Scores
At High effort, Claude Fable 5.2 scored 45.3% on FrontierCode 2.0 versus Opus 5.5's best 45.5% for roughly half the cost per task, ahead of GPT-6 Astra's 42.8%; at Xhigh effort it hit 49.1%.
Long-Horizon Agent Orchestration
Starting from an empty folder, Fable 5.2 coordinated over 1,000 subagents for eight days to deliver a bootable OS with drivers, file storage, windows and an installer, plus a hypervisor backed by 3,500+ machine-checked proofs.
Vulnerability Discovery via Mythos 5.2
On the internal CVE Rediscovery evaluation against 1,829 CVEs, Claude Mythos 5.2 found 10.2% more vulnerabilities than Opus 5.5 and 14.4% more than Mythos 5.1; one security firm found one in six confirmed bugs reported by Mythos were missed by every other frontier model tested.
Vision and Chart Comprehension
Claude Fable 5.2 scored 66.4% on Chartography at Medium effort, beating Opus 5.5 at Max effort (64.4%) for under a tenth of the cost per task, and reached 83.5 on BenchCAD 2.1 versus 65.3 for Opus 5.5.
Efficient Data Collection & Knowledge Reasoning
On WANDR at Medium effort, Fable 5.2 matched Opus 5.5's top score for about 40% of the cost per task; on Humanity's Last Exam at Low effort, it matched that top score for under a tenth of the cost.
Operating Lab & Manufacturing Hardware with MHS
In the Model Hardware Standard research preview, a standardized MHS driver with simple read/write primitives lets agents run microscopes, liquid handlers and robotic arms in parallel, cutting integration from weeks to hours across any programmable device via the Model Context Protocol.
Claude Fable 5.2: Frequently Asked Questions
Find answers about Claude Fable 5.2 pricing, speed, model selection, safety testing and Mythos access.
How do Fable 5.2 and Mythos 5.2 differ?
They share one model: Fable 5.2 includes cyber and biology safeguards for open release, while Mythos 5.2 is available to verified security and biomedical teams.
What is the cost of Claude Fable 5.2?
$8 per million input tokens and $40 per million output tokens; optional fast mode costs $16 per million input and $80 per million output tokens.
How much faster is Claude Fable 5.2 compared to Fable 5.1?
Up to 30% faster output than Fable 5.1, and fast mode adds up to 2.5x token generation speed.
When should I choose Fable 5.2 over Opus 5.5?
Fable suits the most ambitious, open-ended work; start most tasks on Opus 5.5 and move up or down based on scope and complexity.
What safety testing was performed before release?
Prerelease tests covered sandbox escapes and other risky behaviors, alignment on par with recent models, leaner safeguards and stronger anti-distillation defenses.
Can Fable 5.2 be used for cybersecurity or biomedical work?
Fable 5.2 blocks most cybersecurity tasks, so that work requires Mythos via the Cyber Verification Program; Claude Security now includes Mythos 5.2.
Take On Your Toughest Projects with Claude Fable 5.2
Use Claude Fable 5.2 at $8 per million input and $40 per million output tokens. Add fast mode for extra speed, and apply for Mythos access via the Cyber and Life Sciences Verification Programs.