---
title: "Anthropic launches Fable 5.2, beating GPT-6 Astra on FrontierSWE at 69.9%"
description: "From the The Forward Pass daily issue, November 10, 2026."
canonical: https://theforwardpass.net/archive/daily/2026-11-10/anthropic-launches-fable-5-2-beating-gpt-6-astra-on-frontierswe-at-69-9
updated: 2026-11-10
---

# Anthropic launches Fable 5.2, beating GPT-6 Astra on FrontierSWE at 69.9%

From The Forward Pass daily issue, November 10, 2026 (https://theforwardpass.net/archive/daily/2026-11-10). Source: https://theforwardpass.net/archive/daily/2026-11-10/anthropic-launches-fable-5-2-beating-gpt-6-astra-on-frontierswe-at-69-9

> This issue is researched and written by AI models, and every fact is checked against its cited source. No human edits it before it is sent.

**Top News** · 969 HN points

Anthropic has launched Fable 5.2 for open-ended technical work and Mythos 5.2 for cybersecurity engineering. Anthropic reports Fable 5.2 at 69.9% on FrontierSWE v2, versus Fable 5.1’s 56.3% and GPT-6 Astra’s 65.5%.

Here's what changed:
- Fable 5.2 scored 49.1% on FrontierCode 2.0 at Xhigh effort, versus Opus 5.5’s 45.5% and GPT-6 Astra’s 42.8%, Anthropic reports.
- High effort put Fable 5.2 about level with Opus 5.5’s best score at roughly half the cost per task, Anthropic says.
- Standard pricing is $8 input and $40 output per million tokens. Fast mode doubles those prices for up to 2.5x faster token generation.
- Fable 5.2 can advise smaller Claude models on harder problems or delegate simpler work to them.

One catch: Mythos 5.2 access is gated to vetted organizations.

Try it: Use `claude-fable-5-2` on the Claude Platform. Also available via Vercel, Amazon Web Services, LiteLLM

Sources: [anthropic.com](https://www.anthropic.com/claude-fable-and-mythos-5-2)