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claude mythos 5.2
Claude Mythos 5.2 is the gated, high-capability tier of the same model as Fable 5.2, built for ambitious coding, reasoning, vision and scientific work.
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Why Use Claude Mythos 5.2
Claude Mythos 5.2 shares one engine with Fable 5.2, but unlocks vetted security and life-sciences work while Fable stays broadly available with strong safeguards.
- One Model, Two Access TiersFable 5.2 and Mythos 5.2 run on the same underlying model; Fable ships with robust cyber and biology safeguards, while Mythos is reserved for verified security and life-sciences teams.
- Measured Gains Across Coding, Reasoning and VisionPrerelease testing shows 5.2 ahead of Opus 5.5 on almost every evaluated capability, from completed software migrations to three working devices designed from scratch and two solved black-hole physics problems.
- Long-Horizon Agentic ExecutionThe model sustains unattended work: a Python-to-Rust production migration now starts about 26 times faster, and an eight-day, 1,000-subagent run produced a bootable operating system from an empty folder.
How to Use Claude Mythos 5.2
Route work by scope, tune effort per task, and unlock Mythos-tier capability through Anthropic's verification programs.
Claude Mythos 5.2 Capabilities
From vulnerability discovery to black-hole physics and lab automation, Claude Mythos 5.2 extends the 5.2 engine into high-stakes technical work.
Vulnerability Discovery and Fix Verification
Mythos 5.2 found 10.2% more vulnerabilities than Opus 5.5 and 14.4% more than Mythos 5.1 across 1,829 CVEs, with better calibration and no overstated findings.
Theoretical Physics and Formal Proof
The model autonomously completed a 2003 black-hole calculation under holographic duality, showing the transition stays abrupt in small universes, and formalized Fermat's Last Theorem in 30 hours.
Hardware and Engineering Design Accuracy
On BenchCAD 2.1, Fable 5.2 scores 83.5 for matching reference geometry and circuits, ahead of Opus 5.5 at 65.3 and Fable 5.1 at 44.4.
Pricing and Optional Fast Mode
Claude Mythos 5.2 costs $8 per million input tokens and $40 per million output tokens, generates outputs up to 30% faster than 5.1, and offers a $16/$80 fast mode that speeds token generation up to 2.5 times.
Safety Testing and Fewer Unnecessary Blocks
Prerelease safety work included novel evaluations for behaviors such as sandbox escapes; safeguards are as robust as 5.1 while producing fewer unnecessary blocks, with the strongest protections yet against distillation attacks.
Model Hardware Standard for Lab Automation
The MHS research preview uses a standardized driver with simple read and write primitives to make instruments discoverable, letting model-agnostic agents orchestrate parallel lab and manufacturing devices via protocols like MCP.
Claude Mythos 5.2 — FAQ
Common questions about Claude Mythos 5.2 access, pricing, safeguards, benchmarks and the Model Hardware Standard.
Is Claude Mythos 5.2 a different model from Claude Fable 5.2?
No — both names describe the same underlying model. The difference is safeguards and access: Mythos is reserved for verified security and life-sciences teams.
How much does Claude Mythos 5.2 cost per million tokens?
It costs $8 per million input tokens and $40 per million output tokens. Fast mode at $16/$80 speeds token generation up to 2.5 times.
Why does Fable 5.2 block most cybersecurity requests?
Fable 5.2's cyber and biology safeguards prevent misuse, so security engineering work needs Mythos access through the Cyber Verification Program.
How does it compare with GPT-6 Astra and Gemini 4 Carbon?
At High effort on FrontierCode it matches Opus 5.5's best score for about half the cost and edges GPT-6 Astra's 42.8%; at Xhigh it hits 49.1%.
Can I get the same results with a smaller, cheaper model?
Match the model to scope: start on Opus 5.5, escalate to Fable or Mythos, or let Fable act as Advisor or Orchestrator for smaller models.
What is the Model Hardware Standard research preview?
MHS is a shared, model-agnostic spec for agents driving lab instruments; a standard driver cuts hardware integration from weeks to hours.
Apply for Claude Mythos 5.2 Access
Request Mythos access through the Cyber Verification or Life Sciences programs, or start on Claude Opus 5.5 today and escalate to Fable 5.2 or Claude Mythos 5.2 when the work demands it.