View on models.dev Introducing Claude Opus 5.5
Claude Opus 5.5 leads in agentic coding and knowledge work, and costs 40% less to run than Opus 5 on typical workloads.
Anthropic
Claude Opus 5.5
Claude Opus 5.5 leads in agentic coding and knowledge work, and costs 40% less to run than Opus 5 on typical workloads.
Specs
Model
- Family
- Claude
- Variant
- Opus 5.5
- Weights
- Proprietary
Limits
- Context
- 1,000,000 tokens
- Max output
- 128,000 tokens
Modalities
- Input
- Text Image PDF
- Output
- Text
Pricing
- Input
- $4 / 1M
- Output
- $20 / 1M
- Cache read
- $0.2 / 1M
- Cache write
- $5 / 1M
Capabilities
- Reasoning
- Yes
- Reasoning control
- Effort levels
- Tool calling
- Yes
- Attachments
- Yes
Dates
- Released
- 22 Sept 2026
- Knowledge cutoff
- Jun 2026
Articles
All articlesanthropic.com
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