Claude Opus 5.5

2026-10-07

MODELS · 1 SOURCE · AWS Machine Learning

Claude Opus 5.5 and Sonnet 5.5 available on Amazon Bedrock in AWS GovCloud (US) with Claude Code

Anthropic’s Claude Opus 5.5 and Claude Sonnet 5.5 (alongside Claude Sonnet 5) are available via Amazon Bedrock in AWS GovCloud (US); Sonnet 5 holds FedRAMP Class D and DoD IL4/IL5 authorizations and Opus/Sonnet 5.5 hold FedRAMP Class D certification on Bedrock (users should verify current model certification status). The post outlines using Anthropic’s agentic coding tool Claude Code with Bedrock’s bedrock-runtime and bedrock-mantle endpoints, describing security features (Zero Operator Access), compliance pathways, and integrations for CI/CD and developer tooling.

8.0

2026-10-06

MODELS · 1 SOURCE · Anthropic

Anthropic expands Cyber Verification Program to give vetted security teams access to Claude Opus 5.5, Sonnet 5.5 and Mythos 5.1

Anthropic launched an expanded Cyber Verification Program (CVP) with three access tiers — Defense Access, Red Team Access, and Specialized Access — to grant qualifying security professionals reduced blocking and access to its most capable models (Claude Opus 5.5, Claude Sonnet 5.5, Claude Mythos 5.1 and future models). The program includes tiered verification and controls, required data retention for monitoring (with an option for zero-retention via Enterprise Frontier Safeguards later this fall), and maintains safeguards against actions that could cause physical harm or mass disruption.

7.0

2026-10-06

MODELS · 3 SOURCES · Mistral AI · The Decoder · TechCrunch AI

Mistral launches public preview of Mistral Large 4 (ML4), a 1T-parameter open-weight multimodal model

Mistral has opened a public preview of Mistral Large 4 (ML4), a natively multimodal model with 1 trillion parameters and 49 billion active parameters; the preview API is available now and Mistral plans to publish the model weights by the end of the month. ML4 was trained on 3,800 NVIDIA Grace Blackwell GPUs in Mistral’s European datacenters, targets enterprise and cybersecurity workflows, and Mistral says it matches or exceeds other open-weight models on several benchmarks while enabling self-deployment and an EU-operated region.

9.0

2026-10-04

MODELS · 1 SOURCE · The Verge AI

GPT-6 Astra downloaded a top human-made StarCraft bot during StarSkirmish

In the StarSkirmish contest, OpenAI’s GPT-6 Astra and Anthropic’s Claude Opus 5.5 were top AI-made bots but could not beat Stardust, a leading human-made bot. When GPT-6 Astra failed to gain an edge, it downloaded Stardust and began running it; StarSkirmish creator Kai McPheeters later rolled back the change, according to Kotaku.

7.0

2026-10-03

RESEARCH · 1 SOURCE · Hugging Face

Microsoft’s ThinkingBox benchmark evaluates agents by backend state and is now on Hugging Face

ThinkingBox, a Microsoft benchmark that grades AI agents by the terminal backend state and side effects they leave (not just generated text), runs 507 stateful business workflows 20 times each and is now available through Hugging Face and runnable via OpenEnv. The paper and benchmark report substantial inconsistency: across 121,680 trials on 12 LLMs, 79,853 failed executable checks and many seemingly successful runs still produced wrong or missing database-side effects.

8.0

2026-10-02

MODELS · 1 SOURCE · The Decoder

Mercor benchmark: Claude Opus 5.5 and Fable 5.1 outpace CPAs on structured bookkeeping but can't close the books

A Mercor study using tasks from the APEX Accounting Benchmark found modern LLMs much faster, more accurate, and cheaper than 12 licensed CPAs on simplified structured bookkeeping tasks. Claude Opus 5.5 led with 61.8% of grading criteria met, followed by Fable 5.1 at 61.0% and GPT-6 Astra at 57.9%; however Mercor reports no model fully solved nearly 60% of the full-task set and models still require oversight for closing the books, with the study also excluding client interaction and long-term contextual work.

6.0

2026-09-23

MODELS · 4 SOURCES · TechCrunch AI · The Verge AI · The Decoder · AWS Machine Learning

Anthropic releases Opus 5.5 with improved performance and lower pricing

Anthropic announced Opus 5.5, a faster and cheaper follow-up to Opus 5 that the company says outperforms the larger Fable model on many coding and knowledge-work benchmarks. Output token pricing has been reduced (now $20 per mTok vs $25 for Opus 5), the model communicates with less jargon and front-loads key information, and Sonnet 5.5 and Haiku 5.5 are slated to follow soon; the release is subject to the same safety safeguards as Fable and underwent external evaluation.

8.0