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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
Gemini 3.1 Pro Preview is Google's advanced reasoning model improving long-horizon stability and tool orchestration over Gemini 3 Pro, with a new medium thinking level to balance cost, speed, and performance. It excels at agentic coding, structured planning, multimodal analysis, and workflow automation for autonomous agents and enterprise tasks.
Life, Physical, & Social Science#11Entertainment, Sports, & Media#11Writing, Literature, & Language#13Medicine & Healthcare#13
AuthorGoogle
Country🇺🇸 United States
ReleasedFeb 19, 2026
Overview
Cost rate
2x
Context
1M
Input
Output
Reasoning
Tool calling
Structured outputs
Pricing/M tokens
Input$2.00
Cached input$0.20
Output$12.00
Context
Context length1,048,576
Max output tokens65,536
Knowledge cutoff-
Performance
Throughput116 tok/s
Latency28.37s
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
