general-purpose

Claude Opus 4.6

by Anthropic

Claude Opus 4.6 is Anthropic's flagship frontier language model, featuring a 1 million token context window now generally available at flat pricing. It is designed for complex reasoning, long-document analysis, and advanced agentic tasks, scoring 78.3% on the MRCR v2 long-context retrieval benchmark. It is accessible via Anthropic's API at $5 per million input tokens and $25 per million output tokens.

9 Overall Score

Scores

Capability
9
Ease of Use
8
Documentation
9
Reliability
8
Value
7
Momentum
9

Details

Status
active
Pricing
paid
Launch Date
2026-01
Website
https://claude.com/blog/1m-context-ga
Last Updated
2026-03-15

Key Features

  • 1 million token context window (GA)
  • Flat pricing at $5/$25 per million input/output tokens
  • 78.3% MRCR v2 long-context retrieval benchmark score
  • Advanced multi-step reasoning and agentic task execution
  • Multimodal capabilities (text and vision)

Tech Stack

Transformer architectureConstitutional AI (CAI)RLHFPython SDKTypeScript SDKREST API