Claude Opus 4.5

anthropic/claude-opus-4-5-20251101

Flagship Claude model for deep reasoning, coding, and long-horizon agents

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Context window: 200K
Input: Document · Image · Text
Output: Text
Released: 2025-11-01

Max output: 64K
Knowledge cutoff: 2025-05
Weights: Closed
Capabilities: Attachments, Reasoning, Temperature, Tool call

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Performance

Overall capability

48.4/100

Coding: —
Reasoning: 42.3
Professional work: —
Knowledge & language: 62.4


MCP Atlashigh	Professional work	Scale AI	2026-11-05
Humanity’s Last ExamClaude Opus 4.5 (Reasoning)	Reasoning	Artificial Analysis	2026-11-05
AA-LCRClaude Opus 4.5 (Reasoning)	Knowledge & language	Artificial Analysis	2026-11-05
Mystery Game Puzzles	Reasoning	Epoch AI	2026-11-05
Chess Puzzles	Reasoning	Epoch AI	2026-11-05
Vibe Code Bench v1.1	Coding	Vals AI	2026-11-05
BullshitBench v2	Knowledge & language	BullshitBench	2026-11-05
MedCode	Professional work	Vals AI	2026-11-05

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ModelRegistry · Catalog updated 2026-11-05