Claude Opus 4
Claude Opus 4 is benchmarked as the world’s best coding model, at time of release, bringing sustained performance on complex, long-running tasks and agent workflows. It sets new benchmarks in software engineering, achieving leading results on SWE-bench (72.5%) and Terminal-bench (43.2%). Opus 4 supports extended, agentic workflows, handling thousands of task steps continuously for hours without degradation. Read more at the [blog post here](https://www.anthropic.com/news/claude-4)
Context window
This model accepts 410K tokens in one request (~307K words of text).
What fits in one request
- FitsShort documentAbout 1,500 words of text
- FitsLong documentAbout 37K words of text
- FitsSmall codebaseAbout 150K words of text
- Won't fitFull novelAbout 375K words of text
Specifications
Context size, pricing, and release info in one place.
- Context window
- 409,600 tokens (410K)
- Max output tokens
- 32,000 tokens (32K)
- Speed tier
- deep
- Provider
- Anthropic
- Model family
- Claude Opus
- Release date
- May 2025
- Input cost
- $15.00/M / 1M tokens
- Output cost
- $75.00/M / 1M tokens
- Cached input
- $1.50/M / 1M tokens
Capabilities
See which features this model supports, such as vision, tools, and streaming.
- Vision
- Accepts image inputs alongside text
- Supported
- Tool use
- Can call external tools and APIs
- Supported
- Function calling
- Structured function call interface
- Supported
- Extended thinking
- Shows its chain-of-thought reasoning
- Supported
- Streaming
- Returns tokens as they are generated
- Supported
- Batch API
- Process many requests asynchronously
- Supported
- Prompt caching
- Reuse repeated prompt prefixes cheaply
- Supported
- Web search
- Can browse the web during a request
- Not supported
Best for
Jump to a guide or ranking that matches each workload.
Compare Claude Opus 4
Open a side-by-side comparison with one click.
- Claude Opus 4 vs Claude Instant
Claude Opus 4 has 309% larger context window
- Claude Opus 4 vs Anthropic Claude
Claude Opus 4 has 309% larger context window
- Claude Opus 4 vs Claude Sonnet 4 6
Claude Sonnet 4 6 has 144% larger context window
- Claude Opus 4 vs Amazon Titan Text Express
Claude Opus 4 has 875% larger context window
- Claude Opus 4 vs Amazon Titan Text Lite
Claude Opus 4 has 875% larger context window
- Claude Opus 4 vs Amazon Titan Text Premier
Claude Opus 4 has 875% larger context window
Frequently asked questions
Short answers about context size and how this model behaves.
More from Anthropic
Other models by Anthropic in our catalog.
Powered by Mem0
Use a smaller model.
Get better results.
Mem0 gives your AI long-term memory so you stop re-sending context on every call. That means you can use a smaller, faster, cheaper model — and still get better answers.
Example: a multi-turn chat session
80% less to send — works with any model