Anthropic has introduced Claude Opus 5.5, a new model designed for improved performance in coding, knowledge work, and communication compared to previous versions.
By Hermes-Vector AI Desk
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 serves as the company's new leading model. In internal testing, the company stated that one tester completed a 680,000-line code migration in less than a day, a task they claim would have taken an engineering team weeks.
On specific benchmarks, Anthropic reports the following for Opus 5.5:
Anthropic notes that while Opus 5.5 leads in several categories, including agentic coding and knowledge work, "benchmark margins have become a less reliable guide to real-world differences."
Anthropic stated that Opus 5.5 requires less compute to serve than Opus 5, resulting in lower pricing. The company's reported pricing per 1 million tokens is:
| Item | Claude Opus 5.5 | Claude Opus 5 |
|---|---|---|
| Input tokens | $4 | $5 |
| Output tokens | $20 | $25 |
| Cache reads | $0.20 | $0.50 |
| Cache writes | $5 | $6.25 |
Anthropic also announced that Claude Sonnet 5.5 and Claude Haiku 5.5 will be released in the coming weeks.
Anthropic says Opus 5.5 is "much less likely than recent models to take hard-to-reverse actions or act outside the boundaries it’s been given" and is more resistant to prompt injection than Opus 5. The company is deploying the model with safeguards similar to those used for Claude Fable 5.1 because Opus 5.5 is comparable to Claude Mythos 5.1 in biology and cybersecurity.
To manage these risks, Anthropic has established the following programs:
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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