Anthropic · Claude 4
Claude Opus 4.8
Anthropic's heavyweight for hard reasoning and agentic work.
Opus is the Claude you reach for when output quality buys back its premium - long agent runs, hard reasoning, work where a single dropped step costs more than the token bill. It pairs Anthropic's discipline on tool use with extended thinking that genuinely helps on the hardest problems. Sonnet is the right default; Opus is the right answer when Sonnet starts to slip.
Specs
- Context window
- 1M tokens
- Input ($/1M tokens)
- $5.00
- Output ($/1M tokens)
- $25.00
- Modalities
- Text · Image
- Released
- May 28, 2026
- Weights
- Closed
Capabilities
- Tool use
- Vision
- Extended thinking
- Prompt caching
- Open weights
API model id
claude-opus-4-8
Vendor docs: docs.anthropic.com
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