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Opus 5.5 — AI News Today

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Claude Opus 5.5 — released 22 September 2026, the first model in Anthropic's Claude 5.5 family and the new default Opus. Anthropic reports Claude Fable 5.1-level performance at roughly 40% lower running cost than Opus 5, a 1M-token context window, and strengthened cybersecurity safeguards. API id: claude-opus-5-5.

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295 stories about Opus 5.5

3 from your feeds7 from search

About Opus 5.5

Opus 5.5 is a large language model by Anthropic. Claude Opus 5.5 — released 22 September 2026, the first model in Anthropic's Claude 5.5 family and the new default Opus. Anthropic reports Claude Fable 5.1-level performance at roughly 40% lower running cost than Opus 5, a 1M-token context window, and strengthened cybersecurity safeguards. API id: claude-opus-5-5. This page tracks 295 recent news stories about Opus 5.5, curated from 30+ sources and updated every 15 minutes.

Opus 5.5 — Coverage Momentum

24
This month
↓87%
vs last month
419
All-time
Sep 2026
Peak month
0
0
0
212
183
24
JunJulAugSepOctNov

First tracked Sep 2026. Most-citing sources: r/ClaudeAI (145), Medium (99), r/singularity (43), r/accelerate (33). Data aggregated by Best AI News Today from 30+ sources.

295 stories
1 of 5 Top Stories
Breaking
Muse Wonder vs Claude Opus 5.5: What Developers Can Buy
BreakingMedia

Muse Wonder vs Claude Opus 5.5: What Developers Can Buy

Two of the most powerful artificial intelligence models ever built are now openly competing for developer dollars, forcing companies to make an agonizing choice between Anthropic's newly released Claude Opus 5.5 and a mysterious rival called Muse Wonder that has suddenly materialized in the market. The comparison has shattered assumptions about AI leadership, with early testing suggesting the newcomer may rival or exceed Claude's capabilities at a fraction of the cost, potentially upending the lucrative AI infrastructure market that has long been dominated by a handful of players. For developers accustomed to clear technological hierarchies, the emergence of a credible alternative has arrived at a pivotal moment when every percentage point of efficiency and dollar of savings could determine which start

Memeburn faviconMemeburn·
Related AnthropicMuse Wonder Claude

32 sources

Mashable faviconMashableFacebook faviconFacebookTechCrunch faviconTechCrunch
Media

Best AI Agents [2026]: Terra $1 vs Argon $2 vs Opus 5.5 - https://tech-insider.org/

https://tech-insider.org/ faviconhttps://tech-insider.org/·
Discussions

Blind listening test: 62 people compared 8-bar piano loops written by 8 LLMs (Gemini, Claude, Qwen, Kimi, Grok, GPT-6.1, DeepSeek, Llama). Interim results

I ran this study. Short version: Gemini 4 Argon's loops were preferred most often (66% of pairings) and it was the only model that held up across all four styles. Claude Opus 5.5 was second (61%)....

r/artificial faviconr/artificial·
Kimi K3.1 Pro Weights Out; Leads Opus 5.5 on 16 of 37 Tests
Media

Kimi K3.1 Pro Weights Out; Leads Opus 5.5 on 16 of 37 Tests

FourWeekMBA faviconFourWeekMBA·
Discussions

From a notebook sketch to an animated Godot boss — 3D AI + Opus 5.5

After my first post about After the Wind, I stayed in touch with the developer and asked how he makes his characters. He shared the process behind this penguin boss, from two notebook sketches to a...

r/ClaudeAI faviconr/ClaudeAI·
Google reveals new Gemini 4 Carbon AI model, narrowly beating Claude Opus 5.5 — frontier AI model is also the least likely to hallucinate, benchmarks claim
Media

Google reveals new Gemini 4 Carbon AI model, narrowly beating Claude Opus 5.5 — frontier AI model is also the least likely to hallucinate, benchmarks claim

Last week, Google released its latest AI model, Gemini 4 Carbon, topping intelligence rankings charts.

Tom's Hardware AI faviconTom's Hardware AI·
Discussions

A Solo Developer Built This in 4 Days With Opus 5.5 + Godot. This Is Getting Ridiculous

This is a playable horror level inspired by Silent Hill and Fatal Frame, built solo in four days using Opus 5.5, Godot, and AI-generated 3D assets. Team: One solo developer. Background: Experience...

r/ClaudeAI faviconr/ClaudeAI·
RelatedAI & Games
Media

Anthropic has new rules for its Opus 5.5 model to “steer it ...

Kottke.org faviconKottke.org·
Related Anthropic
Media

Ripple 65B Preview vs Claude Opus 5.5: Dua Pengode Agentik, Dua Ujian yang Berbeda

OrcaRouter faviconOrcaRouter·
Media

Claude Code game cloning: Opus 5.5’s stated limit

NeoTeo faviconNeoTeo·
Gemini 4 Carbon tops AI index, one point ahead of Opus 5.5
Media

Gemini 4 Carbon tops AI index, one point ahead of Opus 5.5

Tbreak UAE faviconTbreak UAE·
RelatedGoogleGemini

13 sources

Tbreak UAE faviconTbreak UAEGadgets 360 faviconGadgets 360
Anthropic web code shows Mythos 5.5 as Fable 5.5 rumors grow
Media

Anthropic web code shows Mythos 5.5 as Fable 5.5 rumors grow

A hidden "Mythos 5.5" label appeared in Anthropic's Mythos page code on November 1, feeding claims that Opus 5.5 requests reach an unreleased Fable 5.5.

Cryptopolitan on MSN faviconCryptopolitan on MSN·
Discussions

Opus 5.5 medium with blender mcp is insane with the right prompting

I've been experimenting with Opus 5.5 Medium and Blender for a medieval game dev project I'm working on, and the results have been fantastic. I tried using Blender with Claude in the past and wasn't...

r/ClaudeAI faviconr/ClaudeAI·
Discussions

Mom?

Even if I post this with praise flair, honestly I'm not exactly sure what I feel about this. I know how good opus 5.5 is. I use it daily for web and mobile development, personal researches/questions...

r/ClaudeAI faviconr/ClaudeAI·
Media

Ripple 65B Preview vs Claude Opus 5.5: Two Agentic Coders, Two Different Exams

OrcaRouter faviconOrcaRouter·
Your Claude Agent Costs 9x More Without Prompt Caching
Media

Your Claude Agent Costs 9x More Without Prompt Caching

by Chew Loong Nian - AI ENGINEER — ​A real Claude Opus 5.5 agent log: 97.5% of prompt tokens were cache hits, so 35 calls came to $2.39 at list prices instead of $22.08. A 101-line script checks your own logs, and shows why a broken...

Towards AI faviconTowards AI·
Discussions

I tried to make Opus 5.5 cheaper with a cheap coding subagent, but It got worse and more expensive

TL;DR: On 12 hard coding tasks, Opus alone solved 81% at $1.20/task. Opus + DeepSeek V4.1 Flash solved 67% at $1.29. I tried 7 team designs (41 setups, ~1,200 runs). None beat Opus alone, and most...

r/ClaudeAI faviconr/ClaudeAI·
Why Claude Switched Models Mid-Task, and How to Plan for It
Media

Why Claude Switched Models Mid-Task, and How to Plan for It

by Felix Anderson — Opus 5.5’s safety classifiers read files, memory, and search results, not just your prompt. Where fallback belongs in a Claude Code or API…

Medium faviconMedium·
Discussions

Opus 5.5 for code, Opus 4.6 for ideas and brainstorming

Opus 5.5 is the coding GOAT. No contest. I’m a pure vibe coder and the amount of vibes I have coded with that beast is insane. I love Claude Code. BUT I do a lot of deep knowledge work alongside...

r/ClaudeAI faviconr/ClaudeAI·

Frequently Asked Questions

What is Opus 5.5?

Opus 5.5 is Claude Opus 5.5 — released 22 September 2026, the first model in Anthropic's Claude 5.5 family and the new default Opus. Anthropic reports Claude Fable 5.1-level performance at roughly 40% lower running cost than Opus 5, a 1M-token context window, and strengthened cybersecurity safeguards. API id: claude-opus-5-5.

Where can I access Opus 5.5?

Opus 5.5 is available at https://www.anthropic.com/claude-opus-5-5. It's developed by Anthropic.

What is the latest news about Opus 5.5?

As of today, there are 295 recent stories about Opus 5.5. Recent headlines include: Best AI Agents [2026]: Terra $1 vs Argon $2 vs Opus 5.5 - https://tech-insider.org/; Anthropic has new rules for its Opus 5.5 model to “steer it ...; Mom?. Updated every 15 minutes.

What other LLM AI models are there?

Opus 5.5 is part of the LLM model category. Browse all comparable AI llm models with live news mentions and benchmarks.