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Claude Opus 5 is Anthropic's flagship model in the Claude 5 generation, representing the top of Anthropic's intelligence tier for coding, agentic workflows, and complex reasoning. It targets the most demanding professional software engineering and long-horizon agent tasks Anthropic offers.
Mathematical#1Document analysis#1Legal & Government#6Writing, Literature, & Language#8
AuthorAnthropic
Country🇺🇸 United States
ReleasedJul 24, 2026
Overview
Cost rate
5x
Context
1M
Input
Output
Reasoning
Tool calling
Structured outputs
Pricing/M tokens
Input$5.00
Cached input$0.50
Output$25.00
Context
Context length1,000,000
Max output tokens128,000
Knowledge cutoff-
Performance
Throughput55 tok/s
Latency19.76s
Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5.
AuthorAnthropic
Country🇺🇸 United States
ReleasedSep 22, 2026
Overview
Cost rate
4x
Context
1M
Input
Output
Reasoning
Tool calling
Structured outputs
Pricing/M tokens
Input$4.00
Cached input$0.20
Output$20.00
Context
Context length1,000,000
Max output tokens128,000
Knowledge cutoff-
Performance
Throughput90 tok/s
Latency39.8s
Benchmarks
Head-to-head scores across reasoning, coding, and agentic indices, plus per-domain rankings.
Intelligence
57.6
Claude Opus 5.5 (Adaptive Reasoning, Max Effort, Default Fallback)
Claude Opus 5.5 (Adaptive Reasoning, Max Effort, Default Fallback)53.4Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback)
Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback)52.7
