Claude Opus 5.5
Claude Opus 5.5 is Anthropic’s new Frontier model: as of September 22, 2026, it replaces Opus 5 and is claimed by the manufacturer to achieve Fable-5.1-level performance at 40 percent lower typical workload costs. Adaptive Thinking is active by default and controllable via effort level; the context window holds one million tokens with 128,000 output tokens. The reasoning classifier errors from Opus 5 have been fixed; only the metacognition refusal remains.
- Proprietary
- Frontier
- Anthropic
- Text
- Vision
- Agentic Orchestrator
- Long Context
- Interactive
Sovereign Risk: TODO TODO
Key metrics
Score · Latency · Cost · Quality
- Total Score Gold
- 81.05
- Routine
- 49.88
- Reasoning
- 31.17
- LLM Judge Avg
- 4.12 / 5
- 100 Coverage
- Avg Task Duration
- 28.61s
- Interactive
- Token Rate
- 0.46tok/s
- Output Rate
- P95 Latency
- 86.09s
- Top 5 %
- Total Tokens
- 54400
- Output Volume
- Cost per 1K
- $0.025
- USD / 1K Requests
- Benchmark Cost
- $1.36
- Total · 54400 tok
Benchmark modules
10 modules · weighted · vs. model median & top performer
Claude Opus 5.5
Best model
Ø All models
Code Quality
88.92
CLI Benchmark
86.67
Logical Reasoning
75.78
UX Writing
81.57
Documentation
85.67
Content Transform.
83
Cultural Intelligence
72.76
Synthesis Quality
62.5
Tool Execution
90
ToolUse Score
76.88
Benchmark Cost
$1.36
Token efficiency & latency
Consumption per module vs. model median
Token consumption per module
Performance profile
Key metrics – legend
Score
- Total Score
- Overall score derived from Routine and Reasoning scores. Basis for the fleet rank and tier assignment (Gold / Silver / Bronze / Standard).
- Routine
- Score for standard tasks: code generation, text transformation, structured outputs. Weighted by task complexity.
- Reasoning
- Score for analytical and logical tasks: multi-step problem solving, mathematical reasoning, structured argumentation.
- Rank
- Position in the fleet comparison, sorted by Total Score. Refers to the snapshot at the time of testing.
LLM Judge
- LLM Judge Ø
- Average quality rating by an independent judge model on a scale of 1–5.
- Coverage
- Share of tasks for which a judge rating is available. 100% means all responses were evaluated.
Latency & speed
- Avg. Task Duration
- Average time per task from the first to the last token of the response, measured across all benchmark tasks.
- Token Rate
- Output speed in tokens per second. Relevant for interactive applications and real-time streaming.
- P95 Latency
- 95th percentile of response times — shows outliers. Lower values mean fewer long wait times in edge cases.
Cost
- Cost per 1K
- API price per 1,000 output tokens in US dollars. Basis for cost calculation in production use.
- Benchmark Cost
- Total cost for the complete benchmark run of this model.