PyyanThe AI Index

Pyyan / Compare / Claude Opus 4.1 vs Claude Opus 5

Claude Opus 4.1 vs Claude Opus 5

2 of 5

Language Models · verified 13 Aug 2026

Claude Opus 4.1Anthropicdeprecated
Claude Opus 5Anthropiccurrent
3 slots left
SpecificationClaude Opus 4.1Claude Opus 5
SummaryRetires 5 August 2026 — migrate now.Complex agentic coding and enterprise work at half the cost of Fable 5.
Context—1M
Input ($/Mtok)—$5
Output ($/Mtok)—$25
LicenceProprietaryProprietary
Max output—128K
Released—24 Jul 2026
Model IDclaude-opus-4-1claude-opus-5
CategoryLanguage ModelsLanguage Models
OfficialAnthropic ↗Anthropic ↗

Highlighted rows are where these differ.

Claude Opus 4.1

Retires 5 August 2026 — migrate now.

Best for migrating away.

Full spec sheet →

Claude Opus 5

  • Thinking on by default — a step change over Opus 4.8
  • 512-token prompt-cache minimum, down from 1024
  • Separate rate-limit bucket from the Opus 4.x pool

Best for agentic coding.

Full spec sheet →