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Claude Opus 4.8

Previous Opus flagship — warmer prose, strong long-horizon work.

currentAnthropic ↗Verified 2026-08-13

$5

per M input

Specifications

Context1Msource · as of 2026-08-13
Input ($/Mtok)$5source · as of 2026-08-13
Output ($/Mtok)$25source · as of 2026-08-13
LicenceProprietarysource · as of 2026-08-13
Max output128Ksource · as of 2026-08-13
Model IDclaude-opus-4-8source · as of 2026-08-13

Official links

Claude Opus 4.8 model pageAnthropic official site

What matters

  • Mid-session system messages supported
  • Adaptive thinking only — budget_tokens removed

Best for long-horizon agents.

Compare with

All 5 side by side →

Claude Opus 4.8 vs Claude Fable 5 →Claude Opus 4.8 vs Claude Opus 5 →Claude Opus 4.8 vs GPT-5.6 Sol →Claude Opus 4.8 vs Gemini 3.1 Pro →Claude Opus 4.8 vs Claude Sonnet 5 →

Also in Language Models

Claude Fable 5 · AnthropicClaude Opus 5 · AnthropicGPT-5.6 Sol · OpenAIGemini 3.1 Pro · GoogleClaude Sonnet 5 · Anthropic