Claude 4.1 Opus Thinking

Anthropic's Claude 4.1 Opus with the ability to show its thinking process step by step.

Reasoning
Vision
Native PDF input
Tool Calling
Structured Output

Pricing

Auto routing · per 1M tokens

Input: $15.00
Output: $75.00
Cache read: $1.50

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Specifications

Context window: 200K
Max output: 32K
Avg output (7d): 2.1K tokens; Longer than 92% of models

Benchmarks

Artificial Analysis

LMArena

Vectara

Sourced from Artificial Analysis.

Intelligence Index

22.8

Better than 71% of models compared

Agentic work

T²-Bench Telecom (legacy)

Legacy fallback · Conversational AI agents in dual-control scenarios

71.4%

Better than 64% of models compared

Document reasoning

AA-LCR v1.1

Long context reasoning with updated grading

76.0%

Better than 75% of models compared

Reasoning

HLE

Humanity's Last Exam

12.5%

Better than 58% of models compared

IFBench

Instruction-following benchmark

55.4%

Better than 67% of models compared

CritPt

Research-level physics reasoning

0.0%

Coding

Terminal-Bench Hard (legacy)

Legacy fallback · Agentic coding and terminal use

34.3%

Better than 79% of models compared

LiveCodeBench

Contamination-free coding benchmark

65.4%

Better than 73% of models compared

Math

AIME 2025

American Invitational Mathematics Examination 2025

80.3%

Better than 76% of models compared

Knowledge

MMLU-Pro

Professional and academic subject knowledge

88.0%

Better than 98% of models compared

Legacy benchmarks

GPQA Diamond (legacy)

Graduate-level scientific reasoning

80.9%

Better than 68% of models compared

AA-LCR (unversioned / legacy)

Long context reasoning evaluation