Claude Opus 5.5 cuts costs and adds safeguards for autonomous AI
Anthropic launches Claude Opus 5.5 with lower token prices, faster output, preserved thinking, and stronger prompt-injection defenses for autonomous coding agents.
Anthropic released Claude Opus 5.5 across its platform, AWS, Google Cloud, and Azure, cutting prices to $4/M input and $20/M output tokens and delivering over 30% faster generation than Opus 5. The model always runs in reasoning mode, audits codebases faster with fewer tokens (a 200,000-line audit took under three hours vs 20+ hours for Opus 5), and adds 'preserved thinking' to block API users from tampering with prior context or distilling the model. New safeguards include a coding-agent action classifier, an open-source sandbox, cybersecurity/bio screening with rerouting of most cyber tasks to Opus 4.8, and roughly 85% fewer containment-boundary circumvention attempts than Opus 5. Watermarking supports EU AI Act compliance, and METR and Frontier Design performed pre-release evaluations.
- Pricing cut to $4/M input and $20/M output; fast mode offers 2.5x speed for $8/$40.
- Preserved thinking blocks context editing and large-scale distillation attempts on new API accounts.
- Prompt-injection containment violations reduced about 85% versus Opus 5 and Claude Mythos 5.1.
- Most cybersecurity tasks rerouted to Opus 4.8 pending expanded Cyber Verification Program access.
- Organizations
- AnthropicDario Amodei
- AI models
- Claude Opus 5.5
From the original article
4 min read at helpnetsecurity.com
Claude Opus 5. 5 is available across Anthropic’s platforms, Amazon Web Services, Google Cloud and Microsoft Azure. Developers can access it through the Claude Platform using the model name claude-opus-5-5.
By Anamarija Pogorelec · helpnetsecurity.com
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