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Anthropic Releases Claude Opus 5.5 With 40% Lower Costs

By Drooid · Sep 23, 2026, 6:10 AM UTC · How we work

Summary

Anthropic Launches Opus 5.5

Anthropic released Claude Opus 5.5, its first model after CEO Dario Amodei urged pacing the frontier.
Opus 5.5 matches Claude Fable 5.1 performance while costing 40 % less than Opus 5.
The model outputs over 30 % faster than Opus 5, speeding coding and knowledge-work jobs.
Opus 5.5 cuts security-boundary bypass attempts by 85 % versus Opus 5 and Mythos 5.1.
Input tokens cost $4/million and output tokens $20/million, down from $5 and $25.

Summary

OpenAI Delays IPO

Anthropic launches Opus 5.5 weeks before its anticipated 2026 stock market debut.
OpenAI postpones its initial public offering to 2027, widening the IPO timing gap with Anthropic.
Alibaba, Moonshot AI and DeepSeek introduce cheaper open-weight AI models, intensifying competition.
Ramp’s lead economist warns the price war could shrink profit margins and limit future revenue growth.
CFOs report sticker-shock from AI spend and are calculating cost-per-task metrics for ROI.

History

Historical Context

In May 2020 Nvidia launched the Ampere-based A100 accelerator, delivering 19.5 TFLOPS of FP32 performance, 40 GB of memory and a $199,000 DGX system price, becoming a cornerstone of AI data-center workloads. The chip’s impact spurred a wave of AI-hardware spending, prompting partnerships such as the June 2024 collaboration with Trend Micro on security tools and scrutiny that led to U.S. export controls on advanced GPUs in late 2022.

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Anthropic Launches Opus 5.5

Anthropic released Claude Opus 5.5, its first model after CEO Dario Amodei urged pacing the frontier.
Opus 5.5 matches Claude Fable 5.1 performance while costing 40 % less than Opus 5.
The model outputs over 30 % faster than Opus 5, speeding coding and knowledge-work jobs.
Opus 5.5 cuts security-boundary bypass attempts by 85 % versus Opus 5 and Mythos 5.1.
Input tokens cost $4/million and output tokens $20/million, down from $5 and $25.

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