Claude Opus 5.5 AI Evaluation | LayerLens - Benchmark Results & Performance

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Claude Opus 5.5 AI Evaluation | LayerLens - Benchmark Results & Performance

Model

Claude Opus 5.5 by Anthropic

Text+image->text

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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. It performs at the level of Claude Fable 5.1 on most tasks while costing 40% less to run, making it a strong choice for complex multi-step coding and knowledge work. Adaptive thinking is always enabled, with developers controlling thinking depth through the effort parameter. It includes preserved thinking, an anti-distillation safeguard that prevents API users from editing Claude's prior context to extract reasoning.

Evaluations

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Latency

—

Context length

tokens

Cost

$4 · $20

input · output per 1M tokens

Key takeaways

Claude Opus 5.5 is Anthropic's flagship model designed for demanding reasoning, coding, and long-horizon agentic work. It excels in complex multi-step coding and knowledge tasks.
It is a Transformer-based model with adaptive thinking always enabled. Developers can control thinking depth via an 'effort' parameter. It includes 'preserved thinking' to prevent API users from editing Claude's prior context.
The model performs at the level of Claude Fable 5.1 but costs 40% less, making it a strong choice for complex tasks. It processes text and image inputs and generates text outputs.
Key capabilities include advanced reasoning and coding. A unique feature is the 'preserved thinking' anti-distillation safeguard, preventing manipulation of its internal reasoning process.
The model has a massive context length of 1,000,000 tokens and a max output of 100,000 tokens. It is proprietary with closed weights, offered by Anthropic and OpenRouter.

Technical specifications

Context length: 1M tokens
Max output: —
Architecture: Transformer
Modalities: text+image->text
Parameters: —
Open weights: No
Licence: Proprietary
Regions: USA
Vendor: Anthropic
Provider model key: anthropic/claude-opus-5.5