Opening article
Anthropic has introduced Claude Opus 4.5, a new frontier AI model. According to the company, it delivers advanced performance for coding, agents, and computer use. It also features major improvements for everyday tasks like spreadsheets and slides, alongside enhanced token efficiency.
Our newest model, Claude Opus 4.5, is available today. It’s intelligent, efficient, and the best model in the world for coding, agents, and computer use. It’s also meaningfully better at everyday tasks like deep research and working with slides and spreadsheets. Opus 4.5 is a step forward in what AI systems can do, and a preview of larger changes to how work gets done.
Claude Opus 4.5 is state-of-the-art on tests of real-world software engineering:
Opus 4.5 is available today on our apps, our API, and on all three major cloud platforms. If you’re a developer, simply use claude-opus-4-5-20251101 via the Claude API . Pricing is now $5/$25 per million tokens—making Opus-level capabilities accessible to even more users, teams, and enterprises.
The effort parameter is brilliant. Claude Opus 4.5 feels dynamic rather than overthinking , and at lower effort delivers the same quality we need while being dramatically more efficient. That control is exactly what our SQL workflows demand.
But different tasks call for different tradeoffs. Sometimes developers want a model to keep thinking about a problem; sometimes they want something more nimble. With our new effort parameter on the Claude API, you can decide to minimize time and spend or maximize capability.
Claude Opus 4.5 excels at long-context storytelling , generating 10-15 page chapters with strong organization and consistency. It's unlocked use cases we couldn't reliably deliver before.
The model’s capabilities outpace some of the benchmarks we use in our tests. A common benchmark for agentic capabilities is τ2-bench , which measures the performance of agents in real-world, multi-turn tasks. In one scenario, models have to act as an airline service agent helping a distressed customer. The benchmark expects models to refuse a modification to a basic economy booking since the airline doesn’t allow changes to that class of tickets. Instead, Opus 4.5 found an insightful (and legitimate) way to solve the problem: upgrade the cabin first, then modify the flights.
Claude Opus 4.5 is a notable improvement over the prior Claude models inside Cursor , with improved pricing and intelligence on difficult coding tasks.
Alongside Opus, we’re releasing updates to the Claude Developer Platform , Claude Code , and our consumer apps . There are new tools for longer-running agents and new ways to use Claude in Excel, Chrome, and on desktop. In the Claude apps, lengthy conversations no longer hit a wall. See our product-focused section below for details.
As our Anthropic colleagues tested the model before release, we heard remarkably consistent feedback. Testers noted that Claude Opus 4.5 handles ambiguity and reasons about tradeoffs without hand-holding. They told us that, when pointed at a complex, multi-system bug, Opus 4.5 figures out the fix. They said that tasks that were near-impossible for Sonnet 4.5 just a few weeks ago are now within reach. Overall, our testers told us that Opus 4.5 just “gets it.”
Many of our customers with early access have had similar experiences. Here are some examples of what they told us:
The release of Claude Opus 4.5 highlights ongoing advancements in frontier model capabilities, particularly in specialized areas like coding and agentic computer use, alongside efficiency gains that impact everyday productivity tasks.