ays after calling for a slowdown on frontier model development, Anthropic is back with another model release. The catch is that the company claims this one is safer.
On Tuesday, the company unveiled Opus 5.5, the latest of its flagship Claude models and what the company calls its "strongest-performing model" on behavioral alignment yet. Additionally, the model features safeguards developed specifically for its most capable models.
One of those safeguards is falling back on previous generations of Opus. For instance, in cybersecurity use cases, most tasks will be rerouted to Opus 4.8, and requests flagged for biology classifiers will be routed to Opus 5. Only vetted organizations through Anthropic's Life Sciences and Cyber verification programs will be able to use Opus 5.5 for these tasks.
Alignment and safety aside, Anthropic laid out a few improvements featured Opus 5.5, including:
- Improved performance, representing a major step up compared to Opus 5 when it comes to complex work, beating previous generations of Opus and Fable 5.1 in benchmarks for agentic coding, knowledge work, computer use and visual chart recognition.
- Improved natural communication, offering clearer writing that's easier to follow, putting the most important information at the top of the outputs.
- Better speed, generating outputs more than 30% faster than Opus 5.
And of course, Anthropic addressed the elephant in the room: costs. Opus 5.5 now requires less compute to serve than its predecessor with pricing to match. Opus 5.5 costs 40% less than Opus 5 on typical workloads. Input tokens cost $4 per million and output tokens cost $20 per million, representing a 20% decrease from Opus 5, though still more than OpenAI's most recent comparable release, GPT-6 Sol, which costs $2 per million input and $10 per million output.
Additionally, cache reads, which the company says make up the majority of agentic and coding work, sit at $0.20 per million tokens, 60% less than Opus 5. Anthropic is also increasing five-hour usage limits on Pro, Max, Team, and seat-based Enterprise plans. The company also said 5.5 versions of Sonnet and Haiku will be made available in the coming weeks, and those will likely cost even less.
Our Deeper View #
There's one thing that Anthropic CEO Dario Amodei noted in his latest essay urging for pacing the frontier that has stuck with me since it was published. He emphasized that "progress will still seem fast." Releasing yet another powerful iteration of its models is seemingly an example of this. However, what's clear with this release is that, while Anthropic is eager to keep up with the stiff competition, not every task is right for frontier AI, and frontier AI is not ready for every task. It's why the fall back plan for safeguards isn't simply an outright refusal to do certain tasks, but rerouting those tasks to less capable versions of its models. And though Amodei said in his essay that we "must make wise use of the time we gain" that we get as a result of pacing, the question we have to ask is how much time do measures like this buy us before these models are being leveraged for riskier tasks?