Anthropic
Claude Opus 5.5 (Adaptive Reasoning, Max Effort, Default Fallback)
Claude Opus 5.5 is a step-change improvement over Opus 5 for agentic coding, long-running agentic tasks, knowledge work, communication, and vision. It is more token-efficient per completed task and reports progress, findings, and next steps in clear language.
Introducing Claude OpusModel Snapshot
TypeLanguage
ReleaseSep 22, 2026
Context1,000,000
Tagsexplicit-caching, fast, file-input, reasoning
Overall
Rank #2 across 687
57.6
Coding
No rank
n/a
Blended Price
Rank #381 across 432
$8.00/M
Strength Profile
Percentile score by analysis domain.
* Cost is inverted: lower input, output, and blended prices rank higher.
Benchmark Percentiles
Higher bars mean stronger relative placement.
Model Details
Runtime
Max Output128,000
Streaming speed is not measured for this model yet.
Pricing
Blended$8.00/M
Input$4.00/M
Output$20.00/M
Catalog$4.00/M in / $20.00/M out
Metadata
Modalities
All Benchmarks
| Metric | Domain | Value | Rank |
|---|---|---|---|
| Artificial Analysis Intelligence Index | overall | 57.6 | #2 |
| LiveBench Mathematics | math | 97.1% | #1 |
| Humanity's Last Exam | reasoning | 61.4% | #1 |
| SciCode | coding, reasoning | 66.9% | #1 |
| Blended Price |