Claude 4.5 Opus Thinking

Claude Opus 4.5 with visible thinking for tougher coding, agent, and research work—built to show its reasoning while tackling long, complex tasks.

Reasoning
Vision
Native PDF input
Tool Calling
Structured Output

Added Nov 1, 2025

Pricing

Auto routing · per 1M tokens

Input: $5.00
Output: $25.00
Cache read: $0.50

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Specifications

Context window: 200K
Max output: 64K
Avg output (7d): 1.6K tokens; Longer than 86% of models

Benchmarks

Artificial Analysis

Vectara

Sourced from Artificial Analysis.

Intelligence Index

29.1

Better than 81% of models compared

Agentic work

T²-Bench Telecom (legacy)

Legacy fallback · Conversational AI agents in dual-control scenarios

89.5%

Better than 84% of models compared

Document reasoning

AA-LCR v1.1

Long context reasoning with updated grading

77.3%

Better than 78% of models compared

Reasoning

HLE

Humanity's Last Exam

30.1%

Better than 79% of models compared

IFBench

Instruction-following benchmark

58.0%

Better than 70% of models compared

Coding

Terminal-Bench Hard (legacy)

Legacy fallback · Agentic coding and terminal use

47.0%

Better than 94% of models compared

LiveCodeBench

Contamination-free coding benchmark

87.1%

Better than 98% of models compared

Math

AIME 2025

American Invitational Mathematics Examination 2025

91.3%

Better than 93% of models compared

Knowledge

MMLU-Pro

Professional and academic subject knowledge

89.5%

Better than 99% of models compared

Legacy benchmarks

GPQA Diamond (legacy)

Graduate-level scientific reasoning

86.6%

Better than 81% of models compared

AA-LCR (unversioned / legacy)

Long context reasoning evaluation