Opus 5.5

From the start

Monday, September 21

1. AvailabilityVercel12:00 AM UTCNews
   Claude Opus 5.5 now available on AI Gateway

   Claude Opus 5.5 from Anthropic is now available on AI Gateway. It is a step-change improvement over Opus 5, with its biggest gains in agentic coding, long-running agent tasks, and knowledge work. Anthropic cites that Opu…

2. NewsWindsurf12:00 AM UTCNews
   Claude Opus 5.5 is now available in Devin

   Claude Opus 5.5 is now live in Devin Desktop and Devin CLI. It is the new #1 on FrontierCode 1.1, edging out Fable 5 and GPT-6 Astra at less than a tenth of the cost of Fable 5.

3. AvailabilityNetlify12:00 AM UTCNews
   Claude Opus 5.5 now available in AI Gateway and Agent Runners

   Anthropic’s Claude Opus 5.5 model is now available through Netlify’s AI Gateway and Agent Runners with zero configuration required. Use the Anthropic SDK directly in your Netlify Functions without managing API keys or au…

Tuesday, September 22

4. NewsMETR7:00 AM UTCNews
   Summary of METR's predeployment evaluation of Claude Opus 5.5

   Note on independence: This evaluation was conducted under an unpaid agreement for AI R&D assessment. 1 We drafted the initial summary, and then Anthropic had the opportunity to review and edit the text. We signed off on…

5. NewsLovable12:00 PM UTCNews
   Faster builds, same quality: Opus 5.5 now in Lovable

   Read this article on the Lovable blog

6. APIClaude API Release Notes12:00 PM UTCNews
   Claude Opus 5.5

   We've launched Claude Opus 5.5 (claude-opus-5-5), a model for long-running agentic coding and knowledge work. It has a 1M token context window by default, 128k max output tokens, and always-on adaptive thinking, at $4 /…

7. AvailabilityWhat's New with AWS3:00 PM UTCNews
   Claude Opus 5.5 is now available on AWS GovCloud (US)

   AWS GovCloud (US) now offers Claude Opus 5.5, Anthropic’s most capable Opus model yet and, the first of the Claude 5.5 model family, a better collaborator that handles long-running coding and knowledge work, reporting ba…

8. AvailabilityWhat's New with AWS3:00 PM UTCNews
   Claude Opus 5.5 is now available on AWS

   AWS now offers Claude Opus 5.5, Anthropic’s most capable Opus model yet and, the first of the Claude 5.5 model family, a better collaborator that handles long-running coding and knowledge work, reporting back clearly on…

9. ReleaseOpenRouter4:32 PM UTCNew Models
   New model: Anthropic: Claude Opus 5.5

   Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. It is particularly strong at multi-step changes in large codebases, code...

10. AvailabilityMicrosoft Azure5:00 PM UTCNews
    Claude Opus 5.5 comes to Microsoft Foundry for long-running coding and knowledge work

    AI models are increasingly taking on work that extends far beyond a single prompt: building a feature across a codebase, investigating a complex issue, synthesizing hundreds of pages of information, or working through a…

11. AvailabilityGitHub Changelog5:10 PM UTCNews
    Claude Opus 5.5 is now available in GitHub Copilot

    Claude Opus 5.5, Anthropic’s newest Opus model, is now available in GitHub Copilot. You can use it for agentic coding, long-running agentic tasks, and knowledge work. In early testing, Opus… The post Claude Opus 5.5 is n…

12. AvailabilityAWS Machine Learning5:28 PM UTCNews
    Claude Opus 5.5 is now available on AWS

    Claude Opus 5.5, Anthropic's most capable Opus model for agentic coding, knowledge work, and long-running tasks, is now available on Amazon Bedrock and Claude Platform on AWS. This post covers what's new in Opus 5.5, pra…

13. NewsSnowflake11:09 PM UTCNews
    Claude Opus 5.5 on Snowflake Cortex AI

    Claude Opus 5.5 is in public preview on Snowflake Cortex AI, bringing improvements in coding, financial analysis, and visual understanding.

14. AnalysisSimon Willison11:46 PM UTCColumns
    Claude Opus 5.5, GPT-6 Sol, GPT-6 Luna, and a new price war

    Yesterday was Grok 4.7 ( pelicans ) and MiMo v2.6 Flash/Pro ( more pelicans ). Today Anthropic released Claude Opus 5.5, and around an hour later OpenAI released GPT-6 Sol and GPT-6 Luna. It's going to take a while to ge…

Wednesday, September 23

15. Analysisswyx (Latent Space)6:41 AM UTCColumns
    [AINews] Claude Opus 5.5, the new default model for AINews — and everybody cuts prices 40-50%

    overshadowing more efficient GPT6 models from OpenAI

Sunday, September 27

16. NewsAmp12:00 AM UTCNews
    Opus 5.5

    article[data-news-slug="opus-5.5"].prose li blockquote, article[data-news-slug="opus-5.5"].prose li blockquote p { font-size: inherit!important; font-weight: inherit!important; line-height: inherit!important; color: inhe…

Monday, September 28

17. NewsAWS News4:14 PM UTCNews
    AWS Weekly Roundup: GPT-6 Sol and Luna, Claude Opus 5.5 on Amazon Bedrock, Strands harness, and more (September 28, 2026)

    If there’s one theme that defined last week, it’s choice. The frontier models keep arriving, and the interesting question is no longer just “how smart is it?” but “which model fits this step, at this cost, at this latenc…

18. SecuritySemgrep12:00 AM UTCSecurity Desk
    Claude Opus 5.5 Writes Working Code but Only Half of It Is Secure

    We ran Claude Opus 5.5 on 186 real CVE tasks. It wrote working code 94% of the time, but secure code only 55% of the time.

19. Analysisswyx (Latent Space)2:44 AM UTCColumns
    [AINews] Opus 5.5 is good at explainer videos

    a rare feature of a capability

Friday, October 9

20. AvailabilityWhat's New with AWS5:13 PM UTCNews
    Anthropic Claude Sonnet 5.5 and Claude Opus 5.5 are now available on Kiro in AWS GovCloud (US)

    Two new Anthropic models are now available in the Kiro IDE and CLI for the AWS GovCloud (US) Regions. Claude Opus 5.5 is Anthropic's most capable Opus model yet and a step up from Opus 5 on long-running agentic coding wo…

The story so far.