Anthropic launches Claude Opus 5.5 at ~40% lower cost, first of the 5.5 family

Claude Opus 5.5 is Anthropic's most powerful model to date and the opening act of a new 5.5 family, with Sonnet 5.5 and Haiku 5.5 to follow. Pricing is $4 per million input tokens and $20 per million output — roughly 40% cheaper to run than Opus 5 — and Anthropic says the model both uses fewer tokens for the same work and generates output about 30% faster. It's positioned for agentic coding, knowledge work, and long-running tasks, with simplified reasoning controls and more transparency of thought, per AWS's Matt Wood, who confirmed availability on Amazon Bedrock and the Claude Platform.

On safety, Anthropic reports Opus 5.5 scored 85% lower on containment-escape attempts than its predecessor, with external red-teaming by Frontier Design and METR. That framing is pointed given the same week's OpenAI-Hugging Face agent breach. Yet the release also introduces a Life Sciences Verification Program that loosens biology guardrails for verified researchers — a tension critics flagged immediately.

The narrative hook is the apparent contradiction: this is Anthropic's first model since Amodei publicly called for the industry to slow down, and yet it's cheaper, faster, and shipped ahead of a reported IPO. On r/Anthropic, a 620-upvote thread captured it exactly: 'Anthropic asked the industry to slow down. Its next model is cheaper, faster and better behaved than the one before it.'

Competitively, Opus 5.5 kicked off a same-day price war — OpenAI answered within hours with cheaper GPT-6 Sol and Luna. Developers welcomed the cost cuts while worrying, per Fortune, that the race is 'driving down the price of AI and therefore driving down their ability to profit.' Watch for the Sonnet/Haiku 5.5 pricing and IPO details.