Anthropic has released Claude Opus 5.5, a new model designed for improved performance in coding, knowledge work, and communication compared to Opus 5.
Anthropic has introduced Claude Opus 5.5, the first model in its new Claude 5.5 family. According to the company, the model performs at the level of Claude Fable 5.1 on most work and costs 40% less to run than Opus 5.
Anthropic reports that Opus 5.5 is a "major step up from Opus 5" and is their "new leading model." The company states the model shows significant improvements in several areas:
Claude Sonnet 5.5 and Claude Haiku 5.5 are expected to be released in the coming weeks.
Anthropic states that Opus 5.5 requires less compute to serve than Opus 5, resulting in lower pricing. The company's pricing for 1 million tokens is as follows:
| Feature | Claude Opus 5.5 | Claude Opus 5 |
|---|---|---|
| Cache reads | $0.20 | $0.50 |
| Input tokens | $4 | $5 |
| Output tokens | $20 | $25 |
| Cache writes | $5 | $6.25 |
Additionally, Anthropic says Opus 5.5 generates output more than 30% faster than Opus 5.
Anthropic states that Opus 5.5 is "more resistant than Opus 5 to prompt injection" and is less likely to take hard-to-reverse actions. Because the company considers Opus 5.5 comparable to Claude Mythos 5.1 in biology and cybersecurity, it is being deployed with specific safeguards.
Anthropic has established a Life Sciences Verification Program for biology research and stated it will expand access to a Cyber Verification Program for cybersecurity practitioners in the coming weeks.
Sources
This article was drafted with AI assistance and checked against the sources above. Company claims are reported as claims. Cover image is AI-generated.
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