# Anthropic launches Fable 5.2 and Mythos 5.2 with science, coding upgrades

> Anthropic releases Fable 5.2 and Mythos 5.2 models with science and coding improvements.
- Title: Anthropic launches Fable 5.2 and Mythos 5.2 with science…
- Summary: Anthropic releases Fable 5.2 and Mythos 5.2 models with science and coding improvements.
- Keywords: anthropic, fable 5.2, mythos 5.2, coding, llm, guardrails, terminal-bench-science, frontiercode 2.0, frontierswe 2.0, aavs, capsids, SiliconANGLE
- Source: SiliconANGLE — https://siliconangle.com/2026/11/09/anthropic-launches-fable-5-2-and-mythos-5-2-with-science-coding-upgrades
- Author: Maria Deutscher
- Published: 2026-11-10T00:08:34+00:00
- Read time: 1 min
- Topics: anthropic, fable 5.2, mythos 5.2, science, coding, llm, guardrails, terminal-bench-science, frontiercode 2.0, frontierswe 2.0, aavs, capsids
## Anthropic launches Fable 5.2 and Mythos 5.2
Anthropic released two new large language models: Fable 5.2 and Mythos 5.2, with science and coding upgrades.
## Fable 5.2 blocks biology and cybersecurity use cases
Fable 5.2 blocks biology and cybersecurity research prompts while Mythos 5.2 has more relaxed guardrails for trusted researchers.
## Fable 5.2 scores 74.6% on Terminal-Bench-Science 0.1
Fable 5.2 scored 74.6% on Terminal-Bench-Science 0.1, a 22% improvement over Fable 5.1.
## Fable 5.2 reduces proof generation time to 30 hours
Fable 5.2 reduced the workflow to 30 hours by spinning up 1,000 agents to parallelize calculations for a mathematical proof.
## Mythos 5.2 models 28 out of 34 AAV capsids
Mythos 5.2 accurately modeled 28 out of 34 AAV capsids, a significant improvement over models that only handle individual proteins.
## Fable 5.2 outperforms in coding benchmarks
Fable 5.2 outperformed Fable 5.1 by more than 13% across two coding benchmarks and built an operating system in eight days.
## Fable 5.2 and Mythos 5.2 pricing details
Fable 5.2 and Mythos 5.2 cost $8 per million input tokens and $40 per million output tokens, 20% cheaper than previous models.
## Key takeaway

Anthropic launched Fable 5.2 and Mythos 5.2, LLMs that improve scientific research and coding capabilities while adding stricter guardrails for biology and cybersecurity.