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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
Claude Fable 5.2 takes on the most ambitious technical work with sharper coding, reasoning and vision — and up to 30% faster output.
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Why Teams Reach for Claude Fable 5.2
Claude Fable 5.2 is Anthropic's model for the most ambitious, open-ended technical work, from production code migrations to open problems in physics.
- Production-grade coding judgmentOver 90% of changes merged into Anthropic's core codebase are now written by Claude; Fable 5.2 fixed stubborn bugs in minutes and moved a critical service from Python to Rust, which now starts about 26 times faster.
- Open problems in science and mathematicsClaude Fable 5.2 completed two open problems in black hole physics through holographic duality and formalized the proof of Fermat's Last Theorem in 30 hours.
- Safeguards and verified access through MythosFable 5.2 and Mythos 5.2 are one underlying model: Fable carries cybersecurity and biology safeguards so anyone can use it, while security and biomedical teams apply for Mythos through the Life Sciences and Cyber Verification Programs.
How to Deploy Claude Fable 5.2
Match the model tier, the effort level and the mode to the scope of the technical work in front of you.
Claude Fable 5.2 Benchmarks and Capabilities
FrontierCode, Chartography, WANDR, HLE and BenchCAD results, long-horizon agent orchestration, Mythos 5.2 vulnerability discovery, and hardware control through MHS.
FrontierCode merge-quality results
At High effort Claude Fable 5.2 scored 45.3% on FrontierCode 2.0 against Opus 5.5's best 45.5% for about half the cost per task, ahead of GPT-6 Astra's 42.8%; at Xhigh effort it reached 49.1%.
Long-horizon agent orchestration
Starting from an empty folder, Fable 5.2 coordinated more than 1,000 subagents for eight days to deliver 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 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 company 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.
Data-collection and knowledge reasoning efficiency
On WANDR at Medium effort, Fable 5.2 matched Opus 5.5's top score for about 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 manufacturing hardware with MHS
In the Model Hardware Standard research preview, a standardized MHS driver with simple read and write primitives lets agents run 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 — FAQ
Answers on Claude Fable 5.2 pricing, speed, model choice, safety testing and Mythos access.
What is the difference between Fable 5.2 and Mythos 5.2?
One shared model: Fable 5.2 carries cyber and biology safeguards for open release, while Mythos 5.2 goes to verified security and biomedical teams.
How much does Claude Fable 5.2 cost?
$8 per million input tokens and $40 per million output tokens; optional fast mode is $16 per million input and $80 per million output tokens.
How much faster is Claude Fable 5.2 than Fable 5.1?
Up to 30% faster output than Fable 5.1, and fast mode adds up to 2.5x token generation.
When should I use Fable 5.2 instead of Opus 5.5?
Fable suits the most ambitious, open-ended work; start most tasks on Opus 5.5 and move up or down by scope and complexity.
What safety testing was done 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 I use Fable 5.2 for cybersecurity or biomedical work?
Fable 5.2 blocks most cybersecurity tasks, so that work needs Mythos via the Cyber Verification Program; Claude Security now includes Mythos 5.2.
Put Claude Fable 5.2 on Your Hardest Work
Run Claude Fable 5.2 at $8 per million input and $40 per million output tokens, add fast mode when you need speed, and apply for Mythos access through the Cyber and Life Sciences Verification Programs.