# Anthropic debuts Claude Fable 5.2 and Mythos 5.2 models as IPO nears > Source: > Published: 2026-11-09 19:04:05+00:00 Anthropic ([ANTH.PVT](https://finance.yahoo.com/quote/ANTH.PVT/)) introduced Claude Fable 5.2 and Claude Mythos 5.2 AI models on Monday.  The company's most powerful models, Anthropic says Fable 5.2 and Mythos 5.2 generate outputs 30% faster than their predecessors and offer improvements across coding, reasoning, and vision. Fable 5.2 is available across the company's platforms today. Mythos 5.2 is limited to organizations that are a part of Anthropic's Life Sciences and Cyber verification programs. The company says Fable 5.2 will also be less expensive to run than Fable 5.1. Fable 5.2 will now cost $8 per million input tokens and $40 per million output tokens. Fable 5.1 cost $10 per million inputs and $50 per million outputs. Tokens are a unit of measurement in AI that represent pieces of words or phrases you type or speak to a model and its responses. AI companies are engaged in a pricing war as models become more efficient and customers look for ways to save on AI services. Industry experts say that over time enterprises will likely rely on a mix of closed-weights models like Anthropic's and open-weights AI models to meet their needs. The idea is to avoid being locked into a single model vendor, while also being able to reduce overall costs. Fable 5.2 and Mythos 5.2 come ahead of Anthropic's anticipated [initial public offering](https://finance.yahoo.com/technology/article/anthropic-publicly-files-ipo-prospectus-noting-strong-revenue-growth-and-massive-spending-131807138.html) later this month. [But recent market turmoil](https://finance.yahoo.com/technology/article/anthropics-ipo-plans-run-up-against-a-battered-wall-street-192138177.html) around the AI trade could derail that. While Wall Street was initially targeting upwards of a $2 trillion valuation for Anthropic's debut, but that could [now end up between $1 trillion](https://finance.yahoo.com/technology/ai/article/anthropic-ipo-what-we-know-143321078.html) and $1.5 trillion. There are also concerns that the company could end up pushing out its debut to a later date in hopes that market conditions will improve. *Email Daniel Howley at* *dhowley@yahoofinance.com**. Follow him on X at* *@DanielHowley* *or reach out on Signal or Telegram.* **Click here for the latest technology news that will impact the stock market** **Read the latest financial and business news from Yahoo Finance**