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Claude Opus 5.5 release
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Anthropic released Claude Opus 5.5, a faster and cheaper mid-range model now available on Amazon Bedrock and the Claude Platform. The update delivers reduced token consumption and lower per-task costs while maintaining capability on coding and knowledge work.
- Claude Opus 5.5 available on Amazon Bedrock and Claude Platform as of September 28, 2026
- Model achieves significantly faster response times with reduced token burn compared to prior version
- Benchmark costs for math and science tasks collapsing while ability increases
- Some agent dependencies broken by cost optimizations in the new release
- Positioned as efficient alternative in expanding frontier model landscape alongside GPT-6 Sol and Luna
[HN]hacker news16
Zero to SaaS in 24 hours with Claude Projects and Opus 5.5
Claude Opus 5.5 uses 95% fewer em dashes, but its answers are getting longer
Claude Isn't Allowed to Write Me Prose
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Claude Opus 5.5 Should Raise Your Ambitions
Claude Opus 5.5: Things People Created
Claude's Load-Bearing Seams
I vibe coded an algorithmic musical fugue generator
Once Claude can measure something, it can make it faster
Anthropic made Opus 5.5 cheaper. Then it broke four things your agent depends on
Evaluator Optimizer
Why are Opus 5.5 and GPT-6 Sol cheaper?
Claude Microfactory
Getting the most out of Opus 5.5 in Claude and Claude Code
Claude Opus 5.5 Intelligence, Performance and Price Analysis (Max)
Claude Opus 5.5
[BLG]blog/rss3
Introducing Claude Sonnet 5.5 on AWS
Anthropic releases Sonnet 5.5, which it calls a significantly cheaper, faster work partner
AWS Weekly Roundup: GPT-6 Sol and Luna, Claude Opus 5.5 on Amazon Bedrock, Strands harness, and more (September 28, 2026)
[BSKY]bluesky5
I included a few references to this year's record-breaking Kākāpō breeding season in a talk I gave yesterday, and since Claude Opus 5.5 is surprisingly capable at pixel art animation I had it create this celebratory video for my closing sl…
"Hey Opus, I want you to make a Zine by Claude, expressing something fundamental about Claudishness or your perspective. Think the original 2600, Principia Discordia, punk zines, etc...."
This is a really important graph showing the cost of achieving 25% or 75% scores in various hard math and science benchmarks. Costs are collapsing even as ability is increasing
Big model release today - I wrote about Claude Opus 5.5, GPT-6 Sol, and GPT-6 Luna - plus comparison grids of pelicans by the different model families at different reasoning levels simonwillison.net/2026/Sep/22/...
Opus 5.5 was a good model in my early use tests, it is the first non-Fable/Astra model to feel like a Fable-class model, and much cheaper, but still hasn't fully solved the dense/weird language issue of the recent Claudes.