What is Claude Opus 4.5?
Claude Opus 4.5 is Anthropic's most intelligent AI model, as of November/December 2025. It's mainly designed for coding and agentic tasks, though like most advanced models it also excels at math.
On SWE-bench Verified, it scores 80.9% — higher than any competing model.
According to Anthropic, Opus 4.5 is a better programmer than most humans. When the company's internal team tested Opus 4.5 on an internal performance engineering exam, it scored higher than any human candidate ever has.
Use Opus 4.5 for:
- Coding — write and debug code across multiple languages and complex systems
- Agents — execute multi-step workflows with consistent decision-making
- Research — synthesize information and produce detailed analysis
In terms of pricing, the model is available at 4 tokens per message on Overchat AI — making Opus-level capabilities accessible to more users and teams than ever before.
Claude Opus 4.5 vs Other AI Models
If you're wondering how Claude Opus 4.5 compares to other top AI models, here's what the benchmarks show:
Claude Opus 4.5 vs Claude Sonnet 4.5
Opus 4.5 outperforms Sonnet 4.5 in every single benchmark, showing up to 176% better performance.
| Benchmark |
Opus 4.5 |
Sonnet 4.5 |
Improvement |
| SWE-bench Verified |
80.9% |
77.2% |
+3.7% |
| Terminal-bench 2.0 |
59.3% |
50.0% |
+9.3% |
| OSWorld (computer use) |
66.3% |
61.4% |
+4.9% |
| ARC-AGI-2 (Verified) |
37.6% |
13.6% |
+176% |
| GPQA Diamond |
87.0% |
83.4% |
+3.6% |
Claude Opus 4.5 vs Gemini 3 Pro
Gemini 3 Pro launched in November 2025 as Google's flagship model and instantly claimed the #1 spot on most coding benchmarks. However, this didn't last long because the Opus 4.5 dethroned it almost immediately.
| Benchmark |
Opus 4.5 |
Gemini 3 Pro |
Winner |
| SWE-bench Verified |
80.9% |
76.2% |
Claude Opus 4.5 |
| Terminal-bench 2.0 |
59.3% |
54.2% |
Claude Opus 4.5 |
| GPQA Diamond |
87.0% |
91.9% |
Gemini 3 Pro |
| MMMLU |
90.8% |
91.8% |
Gemini 3 Pro |
Just days earlier, xAI released Grok 4.1, which excels at coding and math. For a time, it was the world's top-performing model. Read more about Grok 4.1.
Claude Opus 4.5 vs GPT-5.1
Until the release of GPT-6 in early 2026, OpenAI's GPT-5.1 is their flagship model. Opus 4.5 and GPT-5.1 have similar performance levels. Opus 4.5 is better for agentic coding, while GPT-5.1 is slightly better at visual recognition — understanding images.
| Benchmark |
Opus 4.5 |
GPT-5.1 |
Winner |
| SWE-bench Verified |
80.9% |
76.3% |
Claude Opus 4.5 |
| Terminal-bench 2.0 |
59.3% |
47.6% |
Claude Opus 4.5 |
| GPQA Diamond |
87.0% |
88.1% |
GPT-5.1 |
| MMMU (validation) |
80.7% |
85.4% |
GPT-5.1 |
| MMMLU |
90.8% |
91.0% |
GPT-5.1 |
Where to Access Claude Opus 4.5?
Claude Opus 4.5 is available now across multiple platforms. Here's where you can access it today.
Overchat AI
The fastest way to try Claude Opus 4.5 is on Overchat AI. You can start chatting with the model right now.
Chat with Claude Opus 4.5 on Overchat AI
Overchat AI Apps
Opus 4.5 is available in the Overchat web app, iOS app, and Android app. You’ll need a Pro subscription to access it:
- Pro weekly: $4.99
- Pro yearly: $59.99
Overchat AI Alternative: Claude
Opus 4.5 is available in the Claude web app, iOS app, and Android app.
For Developers
Developers can access Claude Opus 4.5 through the Anthropic API using the model string claude-opus-4-5-20251101.
- Claude API — Available with standard API access
- Claude Code — Command-line tool for agentic coding
- Cloud platforms — Available on AWS, Google Cloud, and Azure
In terms of pricing, Claude Opus 4.5 is, probably, one the most expensive models in the world, as of the time of wiring. Here’s the pricing for API usage:
- Input tokens — $5.00 per million tokens
- Output tokens — $25.00 per million tokens
For comparison, GPT-5.1 costs $1.25 input / $10 output, while Gemini 3 Pro costs $2 input / $12 output.
What Can You Do With Claude Opus 4.5?
Claude Opus 4.5 is an advanced reasoning model designed for complex tasks, particularly coding. Unlike GPT 5.1, Claude Opus 4.5 is not a creative model that excels at handling both text and reasoning, so it is not the best choice for writing tasks. Use Claude Opus 4.5 for:
Coding
At the time of writing this article, Opus 4.5 is the best coding model, hands down, and it shows especially strong performance on real-world software engineering benchmarks. It produces higher-quality code in 7 out of 8 programming languages on the SWE-bench Multilingual platform, outperforming other models by scoring 89.4% on Aider Polyglot.
The Antropic team particularly highlights its ability to understand large codebases and trace behavior flow between files and system components. This means you can point it at a complex issue spanning multiple codebases, and it will figure out the fix. This makes tasks that were nearly impossible for Sonnet 4.5 just weeks ago automatable with AI.
Agents
Opus 4.5 is great at running agent-based workflows for a long time. In Vending-Bench, which is a game that simulates managing a business over time, Opus 4.5 earned $4,967.06 — 29% more than Sonnet 4.5. It makes decisions based on trade-offs without needing constant guidance.
Computer Use
Advanced users and developers will find that Opus 4.5 is an excellent tool for computer use. This involves giving the model full access to your system and allowing it to perform actions on your behalf, such as navigating interfaces, completing tasks autonomously, and changing behavior based on context. Opus 4.5 achieves a score of 66.3% on OSWorld, the leading computer use benchmark.
Research and Analysis
Deep research involves looking up multiple sources and synthesizing the information into an easy-to-understand report. Opus 4.5 is well-suited for this task thanks to its ability to output a large number of tokens, creating detailed and accurate research papers.
Along those lines, Opus 4.5 can now more accurately interpret data found in images, slides, pitch decks, and scanned documents since its vision was improved.
Bottom Line
Claude Opus 4.5 is Anthropic's most capable AI model and currently the best in the world for coding, agents, and computer use. It's already available on Overchat AI.
If you need a model that handles complex software engineering, multi-step workflows, or extended research tasks, Opus 4.5 is your new go-to tool.
Frequently Asked Questions (FAQ)
What is Claude Opus 4.5?
Claude Opus 4.5 is Anthropic's most advanced AI model, released in November 2025. It's designed for complex tasks requiring reasoning and technical precision, with a 200K token context window. It currently leads on SWE-bench Verified at 80.9% and outperforms competing models on real-world software engineering, agentic workflows, and computer use.
Which is Better, Claude Opus 4.5 vs Claude Sonnet 4.5?
Opus 4.5 is generally better than Sonnet 4.5, though these models are designed for different purposes — Opus 4.5 is the most advanced model for complex tasks, while Sonnet 4.5 is a balanced model for everyday tasks. But in terms of benchmarks Claude Opus 4.5 outperforms Sonnet 4.5 on coding (80.9% vs 77.2% on SWE-bench Verified), computer use (66.3% vs 61.4% on OSWorld), and novel problem solving (37.6% vs 13.6% on ARC-AGI-2). Opus 4.5 is significantly more capable for complex, multi-step tasks.
Where to Access Claude Opus 4.5?
You can access Claude Opus 4.5 on Overchat AI right now. It's also available in the Claude web app, Claude Code, and on AWS, Google Cloud, and Azure.
When was Claude Opus 4.5 released?
Claude Opus 4.5 was released in November 2025.
