DigestAI news desk

Cut through the AI noise.

Listen
Generative AI & Modelsupdated 3 min read

Anthropic releases Claude Opus 5.5 with Fable 5.1-level performance and 40% lower cost

Anthropic has released Claude Opus 5.5, the first model in its Claude 5.5 family, available on Amazon Bedrock and Claude Platform on AWS. The model delivers performance comparable to Claude Fable 5.1 on most workloads while costing about 40% less to run than its predecessor, Claude Opus 5. It features improved efficiency, clearer communication, and enhanced safety classifiers aligned with Fable…

78 sources primary source

Key points

  • Claude Opus 5.5 is available on Amazon Bedrock and Claude Platform on AWS as of September 22, 2026.
  • Anthropic states Opus 5.5 performs at roughly Fable 5.1 levels but costs about 40% less than Opus 5 to run.
  • Opus 5.5 generates output over 30% faster than Opus 5 and includes increased usage limits for Pro, Max, and Team plans.

Sources agree on the core improvements: Opus 5.5 uses fewer tokens, generates output over 30% faster, and includes usage limit increases for subscription plans. However, 9to5Mac provides specific benchmark details not mentioned elsewhere, such as Opus 5.5 scoring 1,846 on GDPval-AA v2.1 and achieving 66.4% on Terminal-Bench 4.0, while Mashable notes Anthropic’s caution that benchmark margins may overstate real-world gains. ZDNET highlights customer testimonials from Box, GitHub, and Deloitte, which are not featured in the other reports.

Model pages: Claude Opus 5.5 → · Claude Fable 5.1 → · Claude Sonnet 5.5 →

The story so far

4 episodes →
  2. Anthropic releases Claude Opus 5.5 with Fable 5.1-level performance and 40% lower costthis story
Full story from AWS Machine Learning Blog · by Aamna Najmi primary sourceOpen source ↗

Claude Opus 5.5 is now available on AWS

AWS Machine Learning Blog · 22 September 2026

Loading the full article…

This text was published by AWS Machine Learning Blog and written by Aamna Najmi. It is reproduced here with attribution so you can read it in full; the rights remain with the publisher. Read it at the source ↗

Coverage and discussion

78sources
Topics · follow one to build your own front page
AnthropicAmazonBoxGitHubDeloitte Consulting LLPMETRClaude Opus 5.5Claude Opus 5Claude Fable 5.1Claude Sonnet 5.5Claude Haiku 5.5Claude Mythos 5.1Dario AmodeiYashodha BhavnaniJohn RuelasMario RodriguezCarl BennettDavid Gewirtz

The headline, key points and digest above were generated by Digest AI's editorial model from the linked sources. Automated summaries can contain errors: the sources are the record. Spotted a mistake? Tell us. Published by Martin K., who runs Digest AI and handles corrections.

Comments

via GitHub Discussions

More in Generative AI & Models

All →

Related stories

hot Introducing Mistral Large 4 new Cyara’s CEO outlines AI agent oversight as a workforce model hot ChatGPT generates New Yorker-style cartoons with real cartoonists' signatures without permission new Arcana adds institutional portfolio data to Claude’s connectors hot OpenAI's GPT-6 Astra: Changing Work and Research new Opinion: open-weight AI models may worsen cyber risks without banning closed APIs hot HubSpot adds AEO tool to track brand mentions in AI answers new OpenAI reportedly in talks for $30B round with UAE funds