# Anthropic Releases Claude Opus 5.5: Fable 5.1-Level Performance at 40% Lower Running Cost Than Opus 5

DevFeed: [Anthropic Releases Claude Opus 5.5: Fable 5.1-Level Performance at 40% Lower Running Cost Than Opus 5](<https://devfeed.tech/articles/anthropic-releases-claude-opus-5-5-fable-5-1-level-performance-at-40-lower-running-cost-than-opus-5-58300.md>)

Original publisher: [Read original article](<https://www.marktechpost.com/2026/09/22/anthropic-claude-opus-5-5-release/>)

Author: Asif Razzaq

Published: 2026-09-22T18:59:35Z

Content type: release

Language: en

Sources: [MarkTechPost](<https://devfeed.tech/sources/marktechpost.md>)

Topics: [anthropic](<https://devfeed.tech/topics/anthropic.md>), [Claude](<https://devfeed.tech/topics/claude.md>), [releases](<https://devfeed.tech/topics/releases.md>), [agentic-coding](<https://devfeed.tech/topics/agentic-coding.md>), [computer-use](<https://devfeed.tech/topics/computer-use.md>), [Benchmark](<https://devfeed.tech/topics/benchmark.md>)

Tags: [agentic-ai](<https://devfeed.tech/tags/agentic-ai.md>), [agentic-coding](<https://devfeed.tech/tags/agentic-coding.md>), [ai-shorts](<https://devfeed.tech/tags/ai-shorts.md>), [anthropic](<https://devfeed.tech/tags/anthropic.md>), [applications](<https://devfeed.tech/tags/applications.md>), [artificial-intelligence](<https://devfeed.tech/tags/artificial-intelligence.md>), [benchmarks](<https://devfeed.tech/tags/benchmarks.md>), [claude](<https://devfeed.tech/tags/claude.md>), [claude-opus-5-5](<https://devfeed.tech/tags/claude-opus-5-5.md>), [computer-use](<https://devfeed.tech/tags/computer-use.md>), [cost](<https://devfeed.tech/tags/cost.md>), [editors-pick](<https://devfeed.tech/tags/editors-pick.md>), [for-devs](<https://devfeed.tech/tags/for-devs.md>), [language-model](<https://devfeed.tech/tags/language-model.md>), [large-language-model](<https://devfeed.tech/tags/large-language-model.md>), [machine-learning](<https://devfeed.tech/tags/machine-learning.md>), [new-releases](<https://devfeed.tech/tags/new-releases.md>), [performance](<https://devfeed.tech/tags/performance.md>), [releases](<https://devfeed.tech/tags/releases.md>), [staff](<https://devfeed.tech/tags/staff.md>), [technology](<https://devfeed.tech/tags/technology.md>), [uncategorized](<https://devfeed.tech/tags/uncategorized.md>)

## AI overview

Anthropic has released Claude Opus 5.5, a managed API model that the company says matches Claude Fable 5.1 on most work while costing 40% less to run than Opus 5 at default settings. The article reviews benchmark results, pricing, speed, deployment options, and early coding tests.

## Source excerpt

Anthropic has released Claude Opus 5.5, the first model in its new Claude 5.5 family. The team states it performs at the level of Claude Fable 5.1 on most work. It also costs 40% less to run than Opus 5 on typical workloads at default settings. On Anthropic's own benchmarks, it leads in agentic coding, [...] The post Anthropic Releases Claude Opus 5.5: Fable 5.1-Level Performance at 40% Lower Running Cost Than Opus 5 appeared first on MarkTechPost.