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Long Story Video Skill
Hand Claude Fable 5.2 a 10s–10min story and it runs 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 tough research result into a 3D explainer animation
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Claude Fable 5.2
Claude Fable 5.2 handles your most ambitious technical work with sharper coding, reasoning and vision — and delivers output up to 30% faster.
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What Makes Claude Fable 5.2 Different
Claude Fable 5.2 is Anthropic's model built for the most ambitious, open-ended technical work — from production code migrations to unsolved problems in physics.
- Coding judgment you can shipMore than 90% of the changes merged into Anthropic's core codebase are now written by Claude. Fable 5.2 resolved stubborn bugs in minutes and ported a critical service from Python to Rust, which now boots roughly 26 times faster.
- Research-grade science and mathematicsClaude Fable 5.2 closed two open problems in black hole physics through holographic duality, and formalized the proof of Fermat's Last Theorem in 30 hours.
- Safeguards plus verified Mythos accessFable 5.2 and Mythos 5.2 share one underlying model: Fable ships with cybersecurity and biology safeguards so anyone can use it, while security and biomedical teams request Mythos through the Life Sciences and Cyber Verification Programs.
How to Put Claude Fable 5.2 to Work
Line up the model tier, the effort level and the mode with the scope of the technical work in front of you.
Claude Fable 5.2 Benchmarks and Capabilities
Results across FrontierCode, Chartography, WANDR, HLE and BenchCAD, long-horizon agent orchestration, vulnerability discovery with Mythos 5.2, and hardware control through MHS.
FrontierCode merge-quality scores
At High effort Claude Fable 5.2 scored 45.3% on FrontierCode 2.0 versus Opus 5.5's best of 45.5% for about half the cost per task, ahead of GPT-6 Astra at 42.8%; at Xhigh effort it climbed to 49.1%.
Long-horizon agent orchestration
Starting from an empty folder, Fable 5.2 coordinated more than 1,000 subagents over eight days to ship a bootable operating system with drivers, file storage, windows and an installer, plus a hypervisor backed by over 3,500 machine-checked proofs.
Vulnerability discovery with Mythos 5.2
On the internal CVE Rediscovery evaluation across 1,829 CVEs, Claude Mythos 5.2 surfaced 10.2% more vulnerabilities than Opus 5.5 and 14.4% more than Mythos 5.1; one security firm found that one in six confirmed bugs it reported 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 against 65.3 for Opus 5.5.
Efficient data collection and knowledge reasoning
On WANDR at Medium effort, Fable 5.2 matched Opus 5.5's top score for roughly 40% of the cost per task, and on Humanity's Last Exam at Low effort it matched that top score for under a tenth of the cost.
Operating lab and factory hardware with MHS
In the Model Hardware Standard research preview, a standardized MHS driver with simple read and write primitives lets agents operate microscopes, liquid handlers and robotic arms in parallel, cutting integration from weeks to hours across any programmable device and any agent harness via the Model Context Protocol.
Claude Fable 5.2 — Frequently Asked Questions
Straight answers on Claude Fable 5.2 pricing, speed, model selection, safety testing and how to get Mythos access.
How do Fable 5.2 and Mythos 5.2 differ?
They are one shared model: Fable 5.2 ships with cyber and biology safeguards for open release, while Mythos 5.2 is provided to verified security and biomedical teams.
What does Claude Fable 5.2 cost?
$8 per million input tokens and $40 per million output tokens; optional fast mode runs $16 per million input and $80 per million output tokens.
How much faster is Claude Fable 5.2 than Fable 5.1?
Output is up to 30% faster than Fable 5.1, and fast mode adds up to 2.5x token generation.
When should I choose Fable 5.2 over Opus 5.5?
Fable is built for the most ambitious, open-ended work; start most tasks on Opus 5.5 and scale up or down by scope and complexity.
What safety testing preceded release?
Prerelease testing covered sandbox escapes and other risky behaviors, alignment on par with recent models, leaner safeguards and stronger anti-distillation defenses.
Can I use Fable 5.2 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.
Give Your Hardest Work to Claude Fable 5.2
Run Claude Fable 5.2 at $8 per million input and $40 per million output tokens, switch on fast mode when speed matters, and apply for Mythos access through the Cyber and Life Sciences Verification Programs.