LLMAPI only

Claude Opus 4.1

Anthropic

Updated May 22, 2026 · Benchmarks via Artificial Analysis, specs & pricing via OpenRouter · Methodology · Report an error

Superseded by Claude Opus 4.5

Specifications

Type: LLM
Access: API only
Released: August 5, 2025
License: Proprietary
Context window: 200,000 tokens
Knowledge cutoff: January 31, 2025
Output speed: 120 tok/s
Latency (TTFT): 0.4s
Input: Text, Image
Output: Text
API pricing: $15.00 in · $75.00 out / 1M tokens

Capabilities

Function callingStructured outputWeb search

Benchmarks

Reasoning

80.9

Coding

SWE-bench Verified	74.5
Terminal-Bench	43.3
LiveCodeBench	65.4

Math

78

Agents

TAU-bench Retail	82.4
TAU-bench Airline	56

General

MMLU-Pro	88
Humanity’s Last Exam	11.9

Our take

Incremental upgrade to Opus 4 focused on multi-file refactoring and agentic search.

Links

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