LLMAPI only
Claude Opus 4.5
Anthropic
Updated May 21, 2026 · Benchmarks via Artificial Analysis, specs & pricing via OpenRouter · Methodology · Report an error
Superseded by Claude Opus 4.6
Specifications
- Type
- LLM
- Access
- API only
- Released
- November 24, 2025
- License
- Proprietary
- Context window
- 200,000 tokens
- Output speed
- 58 tok/s
- Latency (TTFT)
- 1.5s
- Input
- Text, Image
- Output
- Text
- API pricing
- $5.00 in · $25.00 out / 1M tokens
Capabilities
Function callingStructured outputWeb search
Benchmarks
Reasoning
Coding
| SWE-bench Verified | 80.9 |
| LiveCodeBench | 87.1 |
Math
| AIME 2025 | 91.3 |
General
| MMLU-Pro | 89.5 |
| Humanity’s Last Exam | 28.4 |
Our take
First model to break 80% on SWE-bench Verified, paired with a major price cut versus Opus 4.1 ($15→$5 input).